The reason behind this could be that your thermostat is set at a very low temperature.
Attic exhaust fan wont shut off.
This is because it is not getting enough air.
Ventilation is very important and in the end will save you money not cost you.
They are typically easier to install and won t detract from the appearance of your roof.
They can quickly remove a larger volume of hot and or humid air from your attic compared to static ventilation which helps save money on your heating and cooling.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
If there are not enough soffit gable or ridge vents a powerful attic exhaust fan can pull the air from your home through the ceiling if it is not perfectly sealed off.
The house was constructed in 1958 and is 2x6 wood frame on 16 centers.
Intake vents located at the lowest part of the roof under the eaves allow cool.
However it may be on a dedicated circuit so you can shut it off in.
A switch to shut it off is a good option.
Read more about why attic fans are a bad idea in my post on attic ventilation.
It helps cool the attic in the summer thus supplimenting your insulation.
Attic fan not turning off.
It could also be because someone hotwired it to the power source.
I recently bought a house that has an attic fan on a thermostat that seems to run whenever the outside temperature gets above about 70.
Make sure the window is at least 30 feet away from the fan.
The attic has about 2 3 of blown in cellulose is pitched i don t know the pitch but it s about average for a typical suburban house and has a gable vent on each end l shaped house.
This will create a nice airflow and allow more air into the fan itself.
The best solution is to add a continuous ridge and soffit ventilation system.
These fans use very little electricity.
Strong attic fans can actually back draft furnaces or water heaters by pulling combustion gases out of their burnersand into the home.
It may be a bad thermocouple but in any case the fan does not know when to shut off.
When your attic reaches a certain temperature it comes on.
Check the contactor relay switch.
You have no need to turn it off.
If you have a closed off attic install a window or open one on the other end.
Remove the access panel with a screwdriver.
Test the contactor with a multimeter to see if it works.
This component tells the air conditioning fan to shut off once the thermostat reaches a reading equal to the temperature setting.
Installed correctly this will vent heat in the summer and moisture in the winter delivering a truly 24 7 365 solution to all your attic ventilation issues.
Some people face the issue of the attic fan not turning off.
It is thermostatically controlled.
