Energy Vanguard Attic Fans

Attic power ventilators are simply not worth the cost and effort.

Energy vanguard attic fans.

During workdays would leave air conditioner off when leaving in the morning. Temp 84f at 5pm. An attic that s brought inside the building enclosure is a beautiful thing. The latest from the energy vanguard blog.

The energy vanguard blog qualifies as best in class in the home performance industry. Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing. They seem to be about the only people that are getting 40cfm per watt. Attic ventilation fans also tend to be quite energy efficient in terms of their own operation.

This is most often done with spray polyurethane foam spf insulation either open cell or closed cell. Here in the southeastern us open cell is most often the spray foam of choice. The attic fan kept my house cooler by 8f compared to pre fan installation days. Energy vanguard llc 533 west howard avenue suite e decatur ga 30030.

Designing high performance heating ventilating air conditioning systems. Yes using fans to put positive pressure in the house would eliminate pulling conditioned air into the attic but if the ceiling has leaks you ve now turned the problem from exfiltration to infiltration and are pushing hot attic air into the house there s also still the problem of using all that power for something that s not necessary. Temp 92 f at 5pm. As joe said if the ceiling is perfectly air.

Subscribe to the energy vanguard blog and. Does anybody actually believe that a 20 watt motor can move 800cfm of air blowing into a solid dome. Subscribe to the energy vanguard blog and newsletter. Posted by allison bailes on september 10 2020.

In fact the home power article states that a typical 250 watt fan would use 180 kwh per month if run continuously. David butler optimal building systems. Helping home energy raters succeed. After attic fan installation ac still off during day.

This was observed on numerous days following the installation. A standard a c powered fan using 400w to get 1200cfm is only 3cfm per watt. Energy vanguard s mission is to turn houses into high performance homes. Teaching building science to professionals and homeowners.

Understanding manual j occupant loads. We closed off eliminated the ridge vents and installed powered vents on thermostats. Many are solar powered and require no other wiring so they don t cause any additional charges on your electricity bill at all. However as a very old builder 70 years i have known cases where roof mounted attic fans have helped tremendously where the roof is a full hip and the ratio of ridge vents to soffit vents was way out of whack.