07/16/2023
While we have a bit of a (wet) reprieve from the heat, we all know the heat will return. In the interest of home air-conditioning / cooling efficiency, if your attic does not already have a ventilation fan, it is a must-have. And if you do have one, make sure it's operating!
A bonus to having a 'cooler' attic is to increase the lifespan of your shingles (assuming they are asphalt shingles). But back to the air conditioning:
Some AC units are located in the attic. Attic spaces can reach 150 F. Even though your attic floor (the ceiling of the rooms below) is insulated, that attic heat is making the ceiling radiate into the room and making the AC work to cool. Cooling the attic space by 40-50 or more degrees with a simple fan is much more efficient than cooling through AC compressors and the like. A 150 F attic is roughly equivalent to 6 below zero (78 degrees departure from 72 F, the standard comfort design temperature for HVAC equipment).
In addition to a ventilation fan, the house must also have a means of drawing air into the attic, which is done by installing gable-end vents and / or ridge vents. Ridge vents are normally installed with new roofing jobs. Vent fans can be installed either in a gable end (which requires a larger vent in the opposite gable or again, a ridge vent).
Happy Cooling!