Solar Attic Fan Temperature Reduction

The benefit from lowering temperatures in the attic and thus reducing heat gain from the attic into the house is usually off set by the electricity use by the fan and the increase in air leakage.

Solar attic fan temperature reduction.

A solar powered attic exhaust fan is designed to extract air from the attic to remove all of that contained heat reducing temperature values to a cool range between 40 50 f. The solar attic fans all moved less than 1 000 cubic feet of air per minute cfm and they did nothing to lower the temperature inside my own attic. An attic ventilation fan with an installation cost of anywhere from 200 to about 1 300 is a common choice. However in order to be capable of reducing and regulating temperature values to acceptable ranges that will cool your attic and reduce air conditioning costs you must make a good estimation of the attic venting load required.

On one hand the national renewable energy laboratory said attic ventilation reduces attic temperature 10 to 25 degrees and slows the transfer of heat into the living space on the other the florida solar energy center university of central florida found that attics with nominal natural ventilation and r 19 ceiling insulation do not need powered vent fans.