Whole House Fans – A Great Tool in Colorado for Comfort and HERS Points
Lower electric bills, improve comfort, and boost your HERS score with a simple, cost-effective solution
Published May 13, 2025
What Is a Whole House Fan
A whole-house fan is a fan that exhausts a large amount of warm air out of a house. At night, when Colorado’s outdoor temperatures typically drop below 70 degrees, cool air naturally flows in through open windows to replace the warm air being exhausted.
Comfort, Fresh Air, and Lower Energy Bills
I believe whole-house fans are a great solution to limit air conditioning use, lower summer electric bills, and deliver cool comfort and fresh air at the most important time of day, when people are going to sleep. However, this newsletter is focused on the needs of builders and the solutions that EnergyLogic can provide. So, how does a whole-house fan fit into the picture?
Whole house fans bring in clean fresh air and flush out hot stale air.
HERS Score Benefits: What Builders Need to Know
Whole house fans are now part of the HERS energy model, and the installation of a whole house fan will have a beneficial impact on the HERS score of a house. EnergyLogic is still reviewing the impacts, but we anticipate a 1-3 point reduction in HERS scores.
Model Your Impact with EnergyLogic’s Team
For the times we are trying to find a couple of HERS points to meet ENERGY STAR or other energy programs, a whole-house fan may be a cost-effective solution. If you are interested in an analysis of how a whole house fan will impact your models, reach out to the EnergyLogic Energy Modeling Team for a scenario analysis.
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