A whole house fan is a large fan that is usually installed in the ceiling but it’s not your typical ceiling fan. This fan is designed to pull the hot air from within a building and force it into the attic space. This creates a pressure within the attic that forces that hot air outside through the soffit vents while the pressure within the house pulls cooler air in through the windows.
This type of fan is a very good addition to your home’s ventilation system and can save you a lot of money on your home energy bills if you live in a warm climate. The whole house fan can lower the temperature in your home fast and will use a lot less energy to do it than an air conditioner would. Not only does this save on the costs of cooling, it is also a much more environmentally friendly way to make your house comfortable. Of course, the whole house fan does have certain disadvantages, as well. The biggest would be that the air being pulled into your home is not filtered so could be full of allergens like pollen and dust. Another disadvantage is that the whole house fan tends to be louder because more are made with direct drive motors to increase speed – that also increases noise. A whole house fan can be ducted instead of ceiling mounted which would eliminate the nouse concern.
A few tips that we’ve picked up from manufacturers of whole house fans that have helped us are also listed here for your convenience.
1) Make sure in cold winter zone climates that you cover the holes that the air flows through during the cold winter months. Otherwise if the holes are left open, the moist heated air from your furnace tends to flow up those openings and condense against the cold surface of your roof. This can lead to dripping condensation and then the follow on to that which is mold growth. A simple effort in covering the holes, or even ducting the fan directly outside would fix this problem in the cold months.
2) Whole house fans are meant to move warm air from your home to the outside. They don’t necessarily excel in improving air quality as some companies claim. While it is true that air flow results from operating whole house fans, it is also of note that they aren’t made primarily with the intention of filtering or improving indoor air quality.
3) What goes in, must go out. In whole house fan terms ,what this means is that if you are directing air flow from your home into your attic, you must size the escape vents for the air to leave the attic properly. If not, the air flow pressure in your home will be unbalanced and will have a chance to return to your indoor areas through walls, outlets, and other various cracks. A simple rule of thumb can be found at this website’s helpful page in item
As for purchasing whole house attic fans, it makes sense to talk to a qualified specialist in your area. If those don’t exist, then you can learn more about the different kinds and styles of whole house fans and whether they could be helpful for you by doing a search on the web. Manufacturers that build these fans themselves, home store websites and of course niche commercial london building contractors sites will have most of the details you need.