It s double trouble for temperature control.
Hot attic over garage.
The heat from the garage will absolutely contribute to high temperatures in the attic space above as well as the finished rooms.
And in homes with attic knee walls i e.
Since your home s heating and cooling system usually does not extend into the garage insulating this area does little to change the cost of running the system.
A lot of bedrooms over garages have both of these problems.
Builders rarely insulate the floor above a garage.
If not you may want to consider adding blown in insulation.
They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees.
If the trusses of your garage roof cannot support an attic you will find that holes will develop in the ceiling of the garage.
The biggest problem with these types of spaces is load capacity.
Install electric ventilators and attic fans which remove hot air from an attic.
If you have a garage then you might want to create a little bit of attic storage above it.
Hopefully the ceiling cavity between the garage and the finished spaces was insulted.
Will the garage heat rise to the attic.