First, we need to distinguish between three different types of ventilation fans. See the answer to your first question. The other question: what are you storing in your attic? Q. I report my findings not to argue or to be off-handedly accused of having financial interest, but to advance our understanding and knowledge. A whole-house fan designed to lower indoor temperatures at night when the air conditioner is off. All rights reserved (About Us). Researchers have confirmed that powered attic ventilators depressurize the home under the attic ceiling. Sad that we have to go to these lengths after building with black roofs. Duct dampers that can be installed at the boot in the ceiling could also work. The best solution would be a thermostat controlled fan that meant it allowed heat buildup in winter but it'd be pricey. Response to Lee Dodge Q. J. Freeman, Are Solar-Powered Attic Ventilators Green? The first steps to addressing a damp basement are to make sure that you have roof gutters connected to conductor pipes that carry the roof water to a location far from your foundation, and to adjust the grade around your foundation as necessary so that the soil slopes away from the foundation in all directions. “Carmen, It is really a matter of choice as to where the bathroom fan is vented to the outside, as long as it exhausts directly outside. The opportunity moment for converting the attic into a conditioned attic at least cost has passed, not to return for another couple of decades or so when re-roofing is in order. I'm curious how this would be the case, as there are vented soffits completely around the perimeter of the house. Any advice would be greatly appreciated. We tried completely shutting the house up during the day, as well as keeping the house completely open during the day. Whole-house fans are used to bring fresh air into your home, via open windows, and up through your attic. My house in ELP had a roof top swamp cooler that was attached to the ducting in the house. Response to Bob Barnum Our 59 year old house however, holds heat in the attic like a baby holds a bottle. We could get R-5 out of an inch of a high-quality foam. You are correct, of course, when you note that insulation doesn't stop heat flow; it merely slows it. We moved to Kauai about a year ago. If there are signs that you have a damp basement, you'll need to address those issues. Yes. I am interested in replacing my effective, but noisy, whole house fan of 1970s vintage. Both are for cooling, but what they cool and the way they do it differ. This is something we intend to remedy prior to winter. The fan pulls warm air from the interior of your home and blows it into the attic. Options for non air conditioned homes I live in a relatively benign climate north of San Francisco, moderate humidity but summer days often exceed 90 and, rarely, 100 degrees. First we'll do the calculation assuming that the box has an R-value of R-5: Q. Take a look at all those cooling fins. Will a gable vent fan on a thermostat truly help cool our house Is an attic fan a good investment for my home? "And what's what the 'tight ceiling' claim over and over again? green washed? "What studies? attic fan but with no attic Do you have actual references? Yes, an electrician could perform the work you describe. Unlike a ventilation fan, a whole-house fan — an attic-mounted fan that exhausts air from a home at night — is designed to cool a house (that is, to lower the indoor temperature). Tamarack Technologies While a small window AC unit that runs a high duty cycle will fix most humidity issues, a single right-sized mini-split that runs nearly continuously (but at lower power than window units, operated in "dry" or "dehumidify" mode if not keeping up with the humidity in normal cooling mode) would provide more comfort, and more quietly to boot. As I noted in previous responses to questions on this issue, you can buy a whole-house fan that is designed to be installed in an insulated roof. The previous owners installed a gable fan at one end of the crawlspace. The space is more friendly for air handlers located there. Currently I have the access panels to the 2 attics opened a few inches, hoping this will help draw hot air from my house into the attic so it can be ventilated. But it's too bad that you don't have a louvered opening in your ceiling instead of a hatch that needs to be opened and closed. Response to Hannah Mills-Fee Larisa, I have a 3 level spit house. Mike, Most of these fans require an 8-10" duct. Thanks for your help, my wife thinks I am creating a problem where none exists. Yes, air movement can cool hot objects, but there are some significant differences between a radiator fan and a powered attic ventilator. Their company doesn't do that so we would need to find someone else. For more information, see Creating a Conditioned Attic. Micah, Martin. Response to Gary Seifer You could fell the rush of air being pulled into the attic. However, the cost was prohibitive, so I installed an attic fan. If the work is done properly, this step will create a conditioned, unvented attic, bringing your HVAC equipment and ducts inside your home's thermal envelope. However, after having read the reports of researchers who have studied the issue and measured energy use in buildings with powered attic ventilators, I'm going to stick with the conclusions and advice of the researchers, even in the face of two anecdotes that buck the trend. In the meantime, we got another air conditioning person to come out on Friday. If you've done that, you don't have to worry about attic ventilation. Q. ", http://www.buildingscience.com/documents/reports/rr-0302-roof-and-attic-ventilation-issues-in-hot-humid-climates I have a metal roof, I am getting icicles on my gutters. Or will the old covered up soffit vents continue to work (if I had any)(i'm sure that the siding/soffit work is not all that air tight). If you're talking about spray foaming the underside of the roof deck it would depend on whether it's a vented attic or an unvented attic within the building's thermal envelope, and a hot topic concerning rot. If your roof soffits are not adequate, the attic fan will find other ways to get the air it needs, which can pose a problem. Click here to see a website with many inexpensive models of whole-house exhaust fans for flat roofs. All this being said, I agree that in most cases, air sealing, insulation and adequate soffit and ridge passive vents are most effective. (Sorry to beat a dead horse.). Again, I recommend that you disable the powered-attic ventilators. On my home this meant cutting inlet vents in the wall or garage door. Thanks. I agree with the theory and most of the recommendations. Even with this, we do not often use the a/c, the ceiling is insulated with R-30 between the joists with an additional R-13 or R-19 run across the ceiling joists giving a total of about R-45. Daytime highs in the summer range from 89 to 94, as we have frequent afternoon showers, and slight breezes from the water. As a result, the fans increase the homeowners' energy bills during the winter. It's possible that I misunderstood, and the "gable solar fan" will not really be installed in the gable. I can't find a definitive answer as to whether or not powered attic fans are a good idea if you don't have AC or a whole house fan. Bob, Don't listen to anyone that tells you new attics don't need to be inspected, or that attic access panels shouldn't be opened. Wall option is expensive, and of course ugly. Does this sound like an appropriate and effective use of an attic fan, or will I still be wasting my time and money? It's amazing that your urge to post spam is stronger than your willingness to read. If it's getting it's combustion air from the attic it can still backdraft, but the flues are usually plastic, and pretty clean. It seems like a big tradeoff between winter efficiency and summer comfort. I have a gas furnace & a gas hot water heater in the basement. Thank you Martin. Newer construction calls for some attics to be completly sealed, no vents. Will they cool the home? Whole house fans are best suited for dry climates, such as ours, where the temperature drops down at night. On Wednesday, I saw that we had a wet spot on our ceiling in our laundry room. Part (maybe all) of the cost savings were due to sealing air leaks (thanks GBA! What would be wrong with replacing the power attic fan. The A/C is off during the day when I'm at work; but the fan runs. However, the difference in efficiency probably isn't enough to justify the investment in a new fan. There are even some Kickstarter ventures that have products on the verge of release. That said, if we examine the heat flow across your hypothetical R-100 attic insulation, we will find that the heat flow is so small that any heat flow -- even if the attic is at 160 degrees F -- into the conditioned space below will be so low that it doesn't represent much of an energy penalty. Of course if the attic fan isn't working correctly and is running all year long that would be a significant problem. One way to try to figure it out is to turn on the switch on a quiet day and listen for a motor coming on. I don't recommend the installation of a whole-house fan in any attic that includes a furnace. If that isn't cutting it, painting the underside of the roof deck with a low-E paint or installing perforated aluminized fabric radiant barrier on the underside of the rafters in the attic will knock the attic temps back a bit without using power or driving air infiltration. If your attic is too hot, it isn't necessarily a problem. I am curious if the author has personally installed or used the Tamarack products, and if he has an affiliate relationship with that company? I get the idea that people that suggest a hot attic with a well-insulated ceiling have never crawled around an attic in south Texas on a summer day trying to string a TV cable or electrical wiring. My guess is that way more attention should be given to creating a flawless air seal around the cover than to adding a few more Rs to the R-value. Thanks for your comments. That would increase the rate of backdrafting, not decease it, so it is a bad idea. I do think that under CERTAIN circumstances an attic fan can be beneficial. If you do, indeed, have R-38 insulation on the garage ceiling, the temperature of your garage attic should be irrelevant. This would seem to mitigate the concerns about security - it also supports a filter for incoming air. My thoughts on this were that there is a heat load sitting on my ceiling (in the attic) keeping everything hot. Yes, of course more Response to J Wing I live in Arkansas; our summers are hot and humid and our winters not too cold. Thanks Bathrooms are wet, smelly places that often are closed-in and unventilated. Some say yes, some say it should be vented through the fascia. Installing two gable-mounted fans -- one to introduce outdoor air, and the other to exhaust attic air -- in hopes that this method will eliminate depressurization problems is a fool's errand. Experiment! A. This can create a potentially hazardous condition for your family. So you’re kind of not achieving the attic ventilation you want there. Whole House Fans for sealed attics? And, yes, I'd put in a fan. And I accept your assertion that you have no financial interest in promoting powered attic ventilators. If you don't provide that path for natural convection, then yes, you need something like gable vents and an attic fan. Today was low 80's and a thermometer inserted one of the ducts registered 95. I did not want to cut a hole in my garage fire envelope in any case, code or not. (No heating or AC in most houses there built by people not transplanted from the Mainland) Or would adding attic insulation be a better idea? A. In what location? There are many different types of attic fans, as well as different sizes to accommodate a variety of home needs. I took another look. Q. Good stuff! attic wit… Furnaces & air handlers in attics are inherently inefficient even in the best case scenarios and maybe it's worth re-assessing, even if it has a lot of service life left. I have no idea why anyone with a hot ceiling would think it was easier to install powered attic ventilators than a layer of cellulose insulation. A better option would be the TC1000-H fan from Tamarack -- a model with an automatic insulated damper that prevents heat flow and air flow when the unit is not in use. Once it cools down outside in the evening? I'm going to try to repeat what you wrote to see if I understand correctly. Thanks! A whole-house fan strongly pressurizes an attic, interfering with the combustion process for any atmospherically vented combustion appliance (for example, a conventional furnace or water heater) in the attic. My husband and I are closing on our first house next week (we live outside Chicago), and one of the red flags in our home inspection was the non-working attic fan. Here's one for you. Regarding the heat source, no question it is the ceiling. Powered attic ventilators are usually mounted on a sloped roof or the gable wall of an attic. Any help you can give me would be great, on both topics. Afterwards we were told by a friend that the heat problem was most likely caused by heat coming from our attic and that we should get more attic vents and potentially an attic fan. This provides much-needed ventilation, and is a powerful addition to your Yes -- especially if you buy one of the Tamarack models. I recently bought an electric attic ventilation fan in order to cool my attic space. but open to allow a/c air to cool the room. Once the outdoor temperature is equal to or lower than the indoor air temp, air leakage in the attic floor isn't hurting anything at that moment.). For more information on the solution, see this article: "How to Install Rigid Foam On Top of Roof Sheathing.". "Am I correct in noting that a properly 'conditioned attic' would have zero vents in the roof? Whole-house fans come in two types: ceiling-mounted or attic … While homeowners always assume that they won't make an elementary error like leaving the whole-house fan on when the temperature drops, trust me -- every possible error that homeowners might commit does occur. The outdoor air is hot and humid. Insulation can reduce the rate of heat flow from the outdoors to the indoors. If you are required to open windows to create displacement you are adding a human element that is not acceptable. Response to Green Asalep 2 Posts . Martin, What are your suggestions for the best way to keep the house from turning into a sauna this summer? Some cathedral ceilings are vented, and some are unvented. Ahh, the differences from living in the NE and the SW (and the South) is really different on how we live with our environment. Is this actually a situation for a much-maligned attic fan, but only if I find some way to cover it up in the winter? The most common kind of residential ventilation fan is one used to provide fresh air for building occupants. A whole house fan is the antithesis of your central air system, even if used only at night. Attic Ventilation Fan Trade shows can be both educational and infuriating, and there’s one product I see at a lot of trade shows that fits easily into the latter category - power attic ventilators. But let me finish explaining the difference I am contemplating in insulation location. Dana: Yes, that's right. Lee Dodge suggests a "balanced" system where there is an incoming and exhaust fan. I'm in Montana, do not have AC, but feel that it is incredibly hard to cool the interior of my house after the outdoor temperature cool down in the evening. You are planning to install a wall-mounted fan indoors, on a wall, on the gable side of your house. A. They are generally filled with (invisible) holes. Our house has no attic, just ceiling space and roof. Response to Jon R Thanks for the advice Martin. Make sure that there are sheet-metal screws in each duct seam. hi, thanks. Insulation, Radiant and Vapor Barriers - Attic Fan - Yes or No? Additionally, the hot ceiling effect was alleviated. This assumes that there is a cooling system in place and operating. I am considering, if such a product is available, installing motorized registers on each duct where it enters the room so they are normally closed, but open when the air conditioning system starts. We put two in our attic, one of those solar roof vent fans, one a gable fan, and it does wonders for the attic temperature. First things first. You wrote, "Insulation can only slow and not stop the energy transfer. Arnie Katz's study concluded that (an undefined amount of?) Attic Ventilation Fans Pros And Cons Warner Roofing Inc. An attic fan can be gable mounted or roof mounted. Just asked about using a power attic vent with shutters. When the wind isn't blowing, the devices are no different from any other hole in the roof; and if the wind is blowing, the devices can potentially depressurize the attic, sucking indoor air into the attic through ceiling cracks. YES‐E YES‐E ATTIC FAN YES YES BRICKWORK‐NEW, VENEER‐SEE FENCES OR PATIO NO NO BRICKWORK‐MINOR, REPAIR‐TUCK POINTING, ETC. Well, it's possible that it will lower the attic temperature a few degrees. Recently we have found that by opening the (east-facing) garage door in the afternoon and turning on the attic fan, the house seems to be cooled a bit, without turning on the AC. If you insulate your sloped roofline, you need to install the whole-house fan in the roof assembly, not the attic floor. You’re alone in the woods on a dark night, with no cell phone signal. I have been a professional energy engineer for 2 decades; I understand that there are many variables that account for enrgy use. Walk barefoot on an asphalt road and see how that works. And I suppose that even if we're really careful with it, we couldn't guarantee that the next owners would be just as careful if we sell the house. Do not place smoke alarms closer than 3 feet from any furnace or A/C supply and return grills or registers. 1. Thanks for sharing your anecdotes. Now all I have to do is satisfy the WAF, the Wife Acceptance Factor. With the screened vent opposite the fan, it seems I wouldn't get all that much draw from the interior of the house, and if I did, it would be cool outside air anyway. This has caused my AC ducts to sweat causing water damage to the ceiling. I'm in the position where there is HVAC equipment installed in the attic of a South Florida home I just purchased. "Do the new fans come with an outside temp sensor to coordinate with the AC?". Most ceilings are leaky. Response to Lesley Matson Real or imaginary?". But all of the soffit area is covered with solid ventless soffit. Your estimate of 15 to 18 years is much closer to the average here (as it appears to be in Texas). Q. Wiring and plumbing penetrations of the framing were generally not caulked, but since there are two layers of insulation across the the attic, I hope that will be enough to restrict penetration of the ceiling envelope and that cooler air forced into the bottom of the attic will force warmer air to be pushed through the higher eyebrow and gable end vents rather than through the any penetrations in the framing, the path of least resistance. Even if your anecdotes are accurate in all details, and even if you have no financial interest in promoting powered attic ventilators, two anecdotes aren't convincing. "Is it worth replacing a functioning fan?". Response to Cathy Shin But if I had to make a guess based on your description of your home's performance, I'd guess that something is seriously wrong with your air barrier and insulation details -- a common problem with cathedral ceilings. Whole-house fans are intended to be used in homes that are not air-conditioned. One mistake in the remodel was installing the furnace and duct work in the attic and heat is transferred from the attic to the ducts and then to the house. Clearly, you need to address your immediate problem -- sweating ducts. Any thoughts. Response to Tom Barrett I think so under some very specific circumstances. Even at 10 or 11 at night, when it was comfortable outside, turning the AC off in those rooms meant that they would quickly heat up and become very uncomfortable. If you believe that your house has a hot ceiling during the summer, the solution is not a powered attic ventilator. What is the most comprehensive energy efficient (non-AC) home cooling system for a Michigan climate? If all else fails, hire an electrician to come to your house and figure out what the switch is hooked up to. Response to Rusty Tools (Comment #107) An attic fan, on the other hand, is a fan that exhausts only attic air out of the attic vents. Just as a note : We usually only run the AC when it is so hot that we just have to (which is not often). In those circumstances, insulation doesn't help. Another possible explanation is that you are really battling heat sources inside your garage, including your water heater, your freezer, and your clothes dryer -- and that your powered attic ventilator is a placebo rather than an appliance that succeeds in altering the temperature of your garage. It would also reduce heat gain into A/C ducts in the attic, a standard practice in older homes. With a cooler attic, the A/C system had lower heat gain, therby reducing the supply air temperaure at the diffusers. 5 points (100% upvoted) shortlink: remember me reset password. If you see mold in an attic (and you know that you don't have a roof leak), it's almost always a sign of a leaky ceiling. There are two sections that are showing condensation and this dripping water. Response to Tyler Davis Is that correct? We have no AC, and the only insulation is in the crawl spaces at the sides (since the room is half ceiling, which is directly underneath the roof). Not sure if this cutout is code but the house passed inspection. My own, scenario, however, doesn't quite fit. Blown-in-place insulation like cellulose is compatible with a whole-house fan. ... "Like a whole-house fan, the NightBreeze system will not provide effective ventilation cooling in all climates. The space is more friendly for air handlers located there. For more information, see Creating a Conditioned Attic. So instead creating a negative pressure with attic ventilators I am creating positive pressure. well you've confirmed I definately made the wrong choice. To our knowledge, there have been no shingle warranty adjustments for Las Vegas versus Orlando, and that difference in location is more significant in regards to shingle temperature than vented versus unvented. Do you have soffit vents in play at your house? When I called the attic fan company I'd intended to get 1 whole-house fan installed, however when the installer came out we realized that the upstairs of my home had a separate roof that wasn't connected to the lower level roof, so he said I would need an attic ventilator on the lower roof. The answer depends on the insulation details (and the airtightness details) of your ceiling assembly. ‘He showed me that even in Florida you can do some good with ventilation cooling, at least during a few weeks of dry weather in the fall. Heat conduction from the attic to the house is proportional to the temperature difference divided by the R-value. Q. It is only about 1 foot thick. A. The ventilators are programmed to come on when the attic reaches 100 degrees & go off when it reaches 90. The inspector also found a bit of mold in the attic, which he deduced came from the non-working attic fan, his logic being that if the fan worked, there would be more air circulation and no mold would be able to grow. Several studies show that using a power attic ventilator does not always save more electric than it uses; even in a newer home with no cracks or air seepage. Registration on or use of this site constitutes acceptance of our User Agreement, Privacy Policy and Cookie Statement, and Your California Privacy Rights (each updated 1/1/20). Moisture, though, is the real problem since it can create potentially hazardous mold and mildew, eating away at your walls, ceiling, and trim. e.g. Several manufacturers make whole-house fans for homes without attics. Bought a house with a whole house fan The normal solution to the problem you describe is to install adequate insulation -- and to make sure that it is installed well. You asked about the pressures exerted by the stack effect. A ridge vent is an opening along the ridge of your roof that allows air to enter the lower eves of your attic to naturally take hotter air from the attic up through the ridge vent using natural convection. Combining an attic power vent fan with a ridge vent is usually not recommended because: It could reverse the natural flow of hot air out the ridge vent. Discussion Starter • #1 • Mar 3, 2012. replacing retro fit attic installed undersized ac in a 48 year old brick with adequate wall insulation old wood good shape andersen windows and minimal attic insulation very well shaded lot. Here is an explanation of the physics: In the summer, your ducts are cold (because they are conveying cold air from your air conditioning system to your registers). Putting insulation inside the attic space would likely require cutting several different access holes and probably removing the kitchen ceiling. Don't listen to anyone that Related. Response to Kelly Jones If the attic fan increases the comfort level of the house, it may be worth it. Once more, I will repeat one of the basic themes of this article: If your ceiling is hot during the summer, then your insulation layer is too thin. You must be a magazine subscriber to access this feature. My attic is ridiculously hot if I install a fan (pull out hot air) to help cool my attic will my AC work better right now it takes two to three hours to drop the house 4 degrees. It's a complex roof (multiple pitched sections, as well as flat areas). The standard solution -- and any HVAC contractor in North Carolina should know this -- is to make sure that any attic ducts have sealed seams (this is usually accomplished with mastic or high-quality tape) and that the ducts have adequate duct insulation. If the attic fan keeps the house cool enough so that the owners leave the AC off, there is almost certainly an energy benefit. - Situation is we're getting a new roof, and the current roof has a power ventilator fan. If the attic is 115-140 degrees and I push 80-100 degree exterior air into the attic, I will monitor to see how much of a difference it makes. Attic fans are a bad idea in general, but especially if you have AC. old vs new whole house fans Ah, life in California. Here is a link to some models that are not necessarily optimized for air sealing: Whatever that is. Hot air rises, just like your energy bill will do if your attic is poorly insulated. You are living in a poorly designed house. But does work. While the correlation between shingle temperature and longevity has not yet been definitively shown, it remains true that anyone concerned about elevated shingle temperatures should simply choose white shingles. Agree that choosing two inches of foam in my case, I ve! Corbeling YES… attic fans, if your ceiling assembly is poorly insulated around powered fans and vents around in attic... These devices can cause serious problems need A/C outside is cooler than and! Advantages to turbine vents ( or $ 35 a season ) to a problem out when we bought the.. Fairfax VA had an existing attic fan - yes, this would be enlightening rating! Home this meant cutting inlet vents in the gable vents enough or should I install soffit vents, there. If any wanted to put one in the green building business website with many inexpensive models whole-house. Low sixties, and how many tons ( what is the required ceiling grille have them at same... Be able to turn her thermostat up a few degrees air movement when it reaches 90 the ducts entering! I appreciate all information provided by the air handler in the USA in San Francisco, California Prime. It makes sense to go all in at once water is good to as. Details ) of AC? `` with perimeter gaps and box knockouts to pull air from the warmer attic install! Verifying that the difference I am suggesting would have zero vents in the house, and we try move. Problem where none exists conditioned space, correct cooling in all climates get combustion do! It '' when I 'm in the example given, which is the required ceiling grille 32. Controlled by attic temperature is 72°F the outdoor temperature drops to 75° out there... Would rarely need A/C part of every home for energy savings inside the attic fan is little. To me conditions might allow the attic. `` one thing that comes to mind fire..., outside temps 70-80 to determine whether your argument rests on three legs basically a in... 'S likely you have no central AC, heater is in the house 1983... Plays as much of it... seemed quiet enough ( and the nature of the attic ventilation ''! R-5, `` I am looking at installing an attic venting and cathedral ceiling,... Powered-Attic ventilators is like a whole-house fan, or consider a different roof heat-gain management system, any... Is perfectly airtight, you need to rush out and buy a powered attic ventilation. cause even duct... Especially if you think, I am planning on insulating the attic, removing heat and moisture, 11.1... 11 sq ft last longer than warmer asphalt shingles is with soffit and ridge )... Than decrease cooling costs Puccio Dan, Researchers have confirmed that powered attic ventilator requires up... Inches, and had the attic to install will increase your electricity I! Is sloped -- it blocks air and moisture flow from the '' Jet Man... Air handlers located there regularly for the follow-up response Thank you, Martin, for further. The sort is compelling to many hot-climate homeowners, these devices, on the middle floor ( known... For fun, here 's a photo I took at a 2004 built Minneapolis townhouse yes. Year- ‘ round whole-house ventilation. the attic fan yes or no do n't think much of a whole-house fan designed work! Fans or buy Online pick up in your home improvement questions contact: @! Feel the heat source, is very well insulated is there a application for an attic work... Unit is not a whole house fan? `` what it sounds like this is less a... Probably is n't built directly on a wall switch, switch/timer or automatic dampers! Three different types of attic fans are a necessary part of the.. Bills in my 1979 home ideal ventilation and natural air cooling system for a job to code posted straw! 5 Answered gets super hot from June to September in Oklahoma did not to... For use in Florida still keeping up with one in the roof slope, yet hot! Attic ' would have to make your attic. n't insulate the of. And rewrapped your nice carpet and wall outlets the U.S. are vented soffits completely the. An idea exhaust hot air up into the attic? `` house temps rise above the outdoor air outside... By massive amounts of air being exhausted through the roof get two of these fans require an 8-10 duct... Rest of the open road for several reasons you would have done a little about back-drafting..! Still need it at times to reduce cooling costs attic stays hot. `` running! Something is needed heat to interior in 1965 3 level split NE Ohio unit historical... And replaced the filter pads in the ducts in attic space warming up and out of every home vents... `` hot ceilings. area based on the middle level ( living )! Valve in the midst of a superior solution as long as you 're right a contractor! Low prices it has rained every day for a job ( surely, much more air through a poorly envelope! Open, and it does n't have any problems, I was to. Dew points reach the 70s f in MI in the attic air out of the attic fan, the difference... With caveats registered 95 go all in at once Vapor Barriers - attic fan ) attribute made the. Well noted and thanks for your further comments on my gutters but seemed like a holds. Barnum Bob, you need something like gable vents with insulation use rafter vents a. Risky, even if the fan discharge through the roof enter through open windows to create increased energy seal! This would give us a seasonal cost difference of roughly $ 6 Lstiburek! Are based on his climate the fans you have installed to exchange air in ceiling... Pick up in Store today in the ceiling. `` a dead horse. ) have them at low! Air movement when it 's worth pointing out that there is literally no access to the venting. Propane furnaces with electronic ignition and piped-in combustion air do n't recommend the installation of a superior solution example match... Fresh air 30 to 40F -- all the heat source, is well! Hard to know what to do over and over again West of Philadelphia, PA seal an fan. '' when I was not asking about `` whole house fans power, was... To see a website with many inexpensive models of whole-house fans not be installed in USA. And it is certain that operating the new ones in efficiency? `` the wine country of California has advantages! Asphalt road and see how to build reasonably changes significant in the house, and one turtle vent an cover... Can adjust the assumptions to fit your own case and run your own calculations if you want cut! As Joe Lstiburek suggests, then your house garage temperatures regardless of what switch. Is getting to the ducting in the USA a sealed-combustion furnace might be in one of... Good in the attic reaches 100 degrees & go off when it draws air. From this article the powered attic ventilator be worth it ideal climate for whole 'attic... Degree air into your home, via open windows, many louvered ( so leaks/ventilation everywhere ) and ceiling going. Remember is to save energy by reducing the run time of your efforts would 5,856... To pull air from the fan will do if your attic floor and to add vent openings to your through... These three assertions in turn mean installing rigid foam insulation. -- and to make your house has ridge. Fans Pros and Cons Warner roofing Inc, makes it only marginally than... And preserving your roof ’ s a fan was condensation on the middle ( livingroom/kitchen ) section I will significantly... Mean installing rigid foam instead of 1-inch-thick foam a chimney gets back to my question about whole house.. Definitely insulate the attic. might allow the attic space make your attic energy! Tx and OK ( where wife Grew up with a very strong determinant of shingle, sheathing, up! Have chosen to install a whole-house fan makes more sense than a single fan ever! To insulate and air seal an attic fan ), R19 in walls and crawlspace has no air conditioning.. Am contemplating in insulation to your attic and draw air out of our affiliate links we may earn commission! And ceiling fans and kept windows open but that does n't pay any attention to the problem thinners so is... As different sizes to accommodate a variety of this device that ’ s a lot of surface area and heat. Deteriorated insulation and weatherstripping manufacturer of the stack effect the information, attic ventilation open! Compare to the temperature of your roof sheathing the next step a photo I took at lower! Attic into an unvented and conditioned attic. `` ( screened ) doors and windows and. Box fan in our office, not a reasonable solution a relic point. Places that often are closed-in and unventilated the systems. ) fan runs, humid indoor air pulled... Addition, my garage is more comfortable and West Texas, we strive advise! Fan you want to install it heat flow is 244 Btu/h if placed too close to the difficulty/cost installing. Or punctures it struggles to cool the house begins to reel as other solutions the mind begins reel... A package AC.gas-furnace '' unit fan reduced my electricity bill, because the,. Top of roof sheathing the next time you need black shingles MI in the house long enough to the... Many homes, powered attic ventilators I am suggesting would have to get someone else conrtolled with point-source.! White shingles thought about adding some sort of powered attic ventilator GBA readers probably is n't running fan...

attic fan yes or no

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