How many CFM do I need for a whole house fan?
We use a general formula of either 2, 2.5, or 3 CFM, or “Cubic Feet per Minute”, per square foot of living space. 2 CFM would provide a good system, 2.5 CFM would provide a better system, and 3 CFM would provide the best system.
What’s the difference between an attic fan and a whole house fan?
Definitions of whole house fan vs. attic fan vary by region, causing some confusion. In a nutshell, whole house fans are designed to run after sundown, using cool night air to ventilate and cool your entire living space. Attic fans are designed to run on hot sunny days to clear super-heated air from your attic.
What is the quietest whole house fan?
Ducted fans are the quietest of the three options because the fan is typically more than 10 feet away from the finished space it cools. Insulated door whole house fans are generally designed to install in an attic floor.
Do you need both attic fan and whole house fan?
The Verdict You don’t need to choose between either a whole house fan or an attic fan; they are not mutually exclusive. You can install a whole house fan to draw air up through the house and an attic fan to remove that air from the attic.
Can you run a whole house fan all night?
Whole house fans can be ran at any time of the day, however, depending on the time of year and the goal you have, the time of day may be different. For cooling purposes during the warmer months of the year, Whole house fans are designed to run whenever it is cooler outside than inside your home.
Is a whole house fan cheaper than AC?
The cost of operating a whole-house fan is also less expensive compared to an air conditioning unit. While energy usage will vary depending on how much you use it and what type of unit you have, in most cases it’s pretty much accepted that whole house systems are less expensive and use less energy.
How many CFM do I need for 2000 square feet?
100 CFM
Heat and energy recovery ventilators
| Total area of home (square feet) | Continuous ventilation rate |
|---|---|
| 1,000 square feet | 50 CFM |
| 2,000 square feet | 100 CFM |
| 3,000 square feet | 150 CFM |
Can whole house fans cause mold?
Many homeowners that have a whole house fan love running them when they get out of the shower to exhaust all that steam and humidity that builds up and can cause mold.
How long does it take a whole house fan to cool a house?
The larger the fan’s capacity, the quicker it will cool the house. The fan should be able to completely exchange all the air in the house every one-to-two minutes. Larger fans will increase comfort and lower the air temperature in the house to near the outdoor temperature in less than one hour.
How many windows do I need for a whole house fan?
Q. How many windows should I leave open and which ones? A: Opening two or more windows half way or more is recommended. Basically you should make it easy for the home ventilation system to pull in air.