Frequently Asked Questions
What is a solar attic fan?
A solar attic fan is an active ventilation system that is typically installed on the roof of an attic. These types of fans use solar panels to collect energy from the sun to propel fan blades, which provide constant air flow to an attic space.
Solar attic fans also help extract excessive heat and moisture in an attic. This helps protect your roof and insulation systems, while providing added comfort to the home.
How to size a solar attic fan?
To determine what size solar attic fan(s) you need for your attic, you first need to know the size of your attic in square feet.
To determine the size of your attic, multiply the width by the length of the attic floor in feet. For a single story house, this is usually the same as the square footage of the house itself.
Next, multiply the square feet of attic space by 0.7 to get the minimum number of cubic feet of air per minute that the fan should be rated to move. Example: 1,000 sq. ft. attic x 0.7 = 700 CFM minimum fan rating
Add an additional 20% (CFM x 1.20) if you have a steep roof, and 15% (CFM x 1.15) for a dark roof. Attic fans come in all different shapes and sizes. Be sure to check the CFM rating of the product that you are interested in prior to installation to determine how many you need.
What is CFM?
CFM, or Cubic Feet per Minute, determines the amount of air that a fan can move while operating at the highest speed. The larger the attic, the higher the CFM must be in order to efficiently cool that space. CFM for attic fans is a critical measurement for sizing and installation.
What is the best solar attic fan?
The best solar attic fans are typically Made in the USA and come with a minimum of a 25-year warranty. Our choice for the best solar attic fan is the Solaro Aire (pictured on this page). We are a certified distributor of Solaro’s products, and based on our experience, we have found them to be the best solar attic fan for ventilation performance, durability, and aesthetics.
Is there a tax credit for solar attic fans?
Solar powered attic fans are eligible for a 26% Federal Tax Credit on the purchase price of the fan, installation and sales tax. Additional incentives may be available through certain State, municipalities, and utility companies.
Do solar attic fans work on cloudy days?
Yes. Ordinary daylight is all that’s required. As long as the product is placed so that the solar panel is not obscured by hedges or under a roof overhang, it will gather sunlight and transform it into DC power.