how to use a whole house attic fan
Watch this video on how to install a whole house fan and how they work. The fan takes the hot and humid air that sits in your attic circulates it and pushes it out of the houses upper space.
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This is known as air exchange.
. A rule of thumb is that you should have one square foot of net free venting area for every 750 CFM of airflow. Besides requiring precise measurements and added dedicated wiring a whole-house fan may require the installation of new attic vents. A good rule of thumb is to provide one square foot of opening for every 750 CFM cubic feet per minute of whole house fan capacity.
It is a simple process but does require some careful planning and fan sizing. The whole house fan then draws cool air from outside in through open windowsdoors and pushes the hot air from inside the house outside through existing vents on the roof effectively cooling your home. Next close the damper on your fireplace if you have one so that soot and odors arent drawn down into your house.
Whole-house fans with electronically commutated ECM motors provide the most energy. Cooler outdoor air enters through open windows lowering the indoor temperature. In hot or cold weather this ensures the elimination of excess heat and moisture by passive or forced attic ventilation.
That translates to lower cooling costs. Run the attic fan during the hottest time of the day. Set the thermostat temperature to 110 degree F for better results.
Secure the grill to the hallway side of the installation. Use high speed to kick-start the cooling and use low to run quietly through the night. The higher the CFM the more venting area is required to keep the system working efficiently.
Opening windows on the lowest level helps to ventilate both the lower and upper levels but sometimes stairways doorways and. Whole house fans should provide houses with 3 to 6 air changes per hour varies with climate floor plan etccheck with a professional to determine what is appropriate for your home. Instead of letting that heat sit and re-enter your house attic fans move hot humid air outside of your home and release it into the cooler overnight temperatures says Zac Houghton CEO at Loftera.
A way better choice than just a attic fan. The windows should remain closed until the next day evening to prevent the chilly air from escaping. Once the needed fresh air is enough close the windows and turn off your fan.
How To Use A Whole House Fan 1 Open a few windows 4-6 inches 2 Turn on your whole house fan using the switch or portable remote and timer 3 Feel the nice cool breeze as air passes through to the attic and fresh air replaces stale trapped air 4 Experience complete indoor air exchanges in your home. To use a whole house fan start by opening up any screened doors and windows in the room youll be in. The whole house fan pulls air in from open windows and exhausts it through the attic and roof.
In fact Fixr says running a whole-house fan costs 90 less than running a central air conditioning unit. It needs to be near a window or door or installed directly into the roof of the attic. A too-warm attic causes ice dams.
Connect to an electrical outlet. Open several windows in your home. In the late evening or early morning the fan is turned on to exhaust hot air from the house.
Spray insulation in the gaps between attic and ceiling. Make sure at least one window is open. Installation Video for Cool Attic and Ventamatic Whole House Fan.
Turn on the fan typically a manual process to avoid forgetting to open the windows and creating a backdraft. For general cooling open windows far away from the fan to provide airflow to the whole house. Attic fans replace the air in your attic by drawing stagnant air out and fresh air in through the roof vents.
Running a whole-house fan overnight instead of the AC can save 70 to 170 per monthA whole-house fan uses 70 to 90 less energy than a central AC system depending on the motor type. Whole-house fans are also cheaper in monthly electric bill costs because a whole-house fan uses far less power than an air conditioning unit. Make sure that the attic has enough venting area.
They can cool your home in less than an hour. Ideally it should be installed at the top level of your home whether that is the top floor or the attic. This way hot stale air under your roof isnt sitting over your home.
Airflow is measured in Cubic Feet per Minute CFM. You can also add larger gable vents. Avoid opening windows or doors without screens since they wont work with a whole house fan.
Run the attic fan in the winter too. So at 3000 CFM youll want four square feet of venting. When installed on the ceiling of your attic they circulate the air at the top of your house.
Whole House Fans Are Typically Installed Inside The Attic Of A Home Between The Ceiling And Living Space Whenever Outside Temperatures Are Cooler You Would Open Your Homes Windows And Turn On Your whole house fan Cooler Outdoor Air Flows Through The Home Cooling The Living Space Of Your Home. A typical fan cant do both the work of an attic and the whole house fan But a whole house fan does both. Average cost to run 8 hours per day.
A whole-house fan is usually installed on the attic floor near the center of your house. Open windows in your house when operating the whole-house. If you add that up over the course of a summer it could lead to substantial savings.
It provides good attic ventilation in addition to whole house cooling. Set fan in the frame and secure with screws. Tip Enlarge your attic venting by adding dormer vents eave vents ridge vents soffit vents or turbine vents.
Apply weather-stripping to fan where it will rest on the plywood. Use an attic fan of the right size. Know When Not to Use the Fan While the whole house fan can be used regularly nearly year-round there are some days when you should keep it turned off.
Opening two or more windows halfway or wider is recommended to allow the fan to do its job. An attic fan isnt just for summer youll use it year-round. Set the humidistat level to 50 for effective removal of moisture.
Whole-house fan energy usage and savings. See more about how to install this type of. Service the attic fan once or twice a year.
Operating an attic fan is simple.
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