Energy Vanguard Attic Fans

Designing high performance heating ventilating air conditioning systems.

Energy vanguard attic fans.

Posted by allison bailes on september 10 2020. Understanding manual j occupant loads. Subscribe to the energy vanguard blog and. We closed off eliminated the ridge vents and installed powered vents on thermostats.

This was observed on numerous days following the installation. After attic fan installation ac still off during day. The problem is solar power attic fans are basically worthless as far as real cfm ratings go. The energy vanguard blog qualifies as best in class in the home performance industry.

Temp 84f at 5pm. This is most often done with spray polyurethane foam spf insulation either open cell or closed cell. Attic ventilation fans also tend to be quite energy efficient in terms of their own operation. Does anybody actually believe that a 20 watt motor can move 800cfm of air blowing into a solid dome.

Attic power ventilators are simply not worth the cost and effort. Gable fans fit into the gable vent and can be set to operate only within a preset temperature range. The latest from the energy vanguard blog. As joe said if the ceiling is perfectly air.

Helping home energy raters succeed. We do this by. Energy vanguard s mission is to turn houses into high performance homes. Energy vanguard llc 533 west howard avenue suite e decatur ga 30030.

A standard a c powered fan using 400w to get 1200cfm is only 3cfm per watt. In fact the home power article states that a typical 250 watt fan would use 180 kwh per month if run continuously. Subscribe to the energy vanguard blog and newsletter. Sources such as the billings gazette energy vanguard and home power all have articles that essentially say the same thing.

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. Teaching building science to professionals and homeowners. During workdays would leave air conditioner off when leaving in the morning. An attic that s brought inside the building enclosure is a beautiful thing.

The attic fan kept my house cooler by 8f compared to pre fan installation days. Here in the southeastern us open cell is most often the spray foam of choice. 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. David butler optimal building systems.