When it comes to the temperature setting of an attic fan, it's best to adjust it to a temperature of 90 to 110 degrees Fahrenheit. It's impossible to say a single number because your attic can effortlessly rise above 95 degrees (on average). In general, most homeowners should set the attic fan temperature between 90 and 110 degrees Fahrenheit. The most recommended temperature setting for an attic fan in summer is 90 to 110 degrees Fahrenheit.
Ideally, the temperature setting should be equal to the outside temperature, and this is the thermostat setting that most HVAC technicians recommend. Typically, set the attic fan to a temperature between 95 and 115 degrees. However, it is important to set the fan to a higher temperature than the ambient outside temperature to prevent the fan motor from burning out. Attic Fan Temperature Setting Most attic fans work with a thermostat that automatically turns the fan on and off based on the temperature set by the homeowner.
Most manufacturers and contractors recommend a temperature setting between 100 and 110 degrees Fahrenheit. If the thermostat is a little high, natural convection cooling from the attic ventilation system will lower the temperature the rest of the way in a reasonably short amount of time after the fan shuts down. I recommend installing an attic thermometer by attaching it to a beam approximately in the center of your attic to get an average temperature. If you want to turn on the attic fan at a lower temperature, change the thermostat setting accordingly, however, for best results, you should be on par with the outside temperature.
Humidistat Thermostat & Most electric attic fans come with a thermostat, which controls when the fan turns on by itself. This is because you are drawing air out of your attic, which is the same as the air you draw into the attic. In poor attic ventilation, the heat in the attic bakes the oils in the asphalt shingles, causing them to deteriorate rapidly, leading to premature roof failure. On the other hand, attic fans not only help expel warm air, but they also work to bring cool air from outside.
The size of an attic fan is measured in CFM, which is a measure of the amount of air removed in a minute. Keep reading the rest of this post for a detailed rundown on how to determine how long you should run your attic fan. Most other home problems that could be solved with attic fans are best solved with better insulation and air sealing. Using a supercharged fan can depressurize the attic causing structural problems, as well as eliminate air conditioning in the home.
And if the temperature setting is too low (such as 90 degrees in Miami), the attic fan will run more often than necessary, possibly running 24 hours wasting energy. If you take notes on how often you run the fan and the heat from the ceiling adjacent to the attic, you will develop an idea of how often you should run the fan. In summer, the thermostat operates the fan when the attic temperature reaches a preset level (typically 90 to 95 degrees F). When this occurs, the attic will supply your home with a constant stream of cool air from above without proper attic insulation, making it difficult to keep the house warm.