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This math formula will work every time, for any size home, and as always the more airflow the better. Here is the formula for proper sizing:įor a “good” system, 2 CFM per square foot of living space.įor a “better” system, 2.5 CFM per square foot of living space.įor the “best” system, 3 or more CFM per square foot of living space. If a whole house fan system is not sized properly, meaning enough airflow, the system will not work effectively.Īirflow is measured in CFM, or Cubic Feet Per Minute. Size is very important to a whole house fan system. These aren’t recommended as some motors, such as ECM, will not work with a variable speed switch and ceiling fan remotes are either low voltage or operate similarly to a variable speed switch. Some customers try and use variable speed switches, ceiling fan remotes, and other types of switches. If you’re not sure about the control then you can always call the manufacturer to get support. This can really frustrate homeowners but as long as you follow the instructions to set it up correctly and set it up with a compatible router, the control will operate as designed. Setting it up on a combined network (that is both 2.4 and 5 GHz) can cause homeowners to have to get back up into their attic to set it up again week after week. You can only set up the control on a 2.4 GHz network, not a 5GHZ network. The drawbacks to Wi-Fi are that each router is different for the setup. It does require a smartphone or tablet to control your whole house fan. You can control the speed and timer from it.
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Wi-Fi controls allow you to control the fan from anywhere in your living space. Wi-Fi controls are the way of the future but there are many variables that will tell a customer if they are a good candidate. If you are downstairs it makes it very annoying to have to go upstairs to control the fan. The drawbacks of a switch and timer are that you cannot control the whole house fan downstairs on a two-story house. This is the most reliable method of controlling a fan without having any issues. This is very convenient throughout the nighttime. This allows the homeowners to control the speed of the fans while being able to set it on a timer. The most reliable type of control is a speed switch and an electronic countdown timer.
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There are many different options to control a whole house fan including wired and wireless controls. A frequent question among whole house fan customers is what controls are offered for their fan.