The garage ceiling has a door to the attic.
Attic is open in garage.
Over a 24 hour period compare the differences in peak temperatures between the outside north in the shade and inside the garage maximum.
As you know cold air settles and hot air rises.
Step 2 create an attic.
Our only attic opening is a very large always open space above wall height in our garage.
I think you should do the reverse one.
Then prop open the garage s attic access ladder by about 12 inches or enough to let a sizable draft enter your attic.
Your attic acts as an insulation between the terrace and the living room.
During this brutally hot summer of 2012 i ve left the garage access door open and it dropped the temperature in the attic substantially.
This insulation is penetrated if you open u.
The first thing you need is access to the attic.
This insulation resists the heat from the terrace to pass it directly to the living room.
Will the garage stay cooler with the trap door closed or open.
For having the air conditioner running almost continuously this summer i thought my utility bills were not that expensive.
You may be able to add extra trusses to the garage in order to secure the attic properly.
Opening your automatic garage door will let cool air and a draft in.
I have a wireless thermometer set pair that allowed me to do a one day test.
To get up there you just lean a latter against the wall and climb on up.
When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still.
Using the measurements from your loft ladder kit you should cut a square out of your garage roof.
The next step is to create the attic.
The primary reason to insulate any part of the home is to provide a thermal barrier between conditioned heated or cooled interior space and the outdoors or unheated spaces such as an unfinished.
In the garage is an access door to the attic.