that aint that bad mine is in same shape but my temps were getting into 110.f to 120.f mid day i put a window unit in and with a good timer mine now stays about 76.mid day down to as low as 55 at night (night time temps been kind of low recently)
but cooler it gets at night in there the longer it takes to warm it up. as long as you got a timer set to run at least 1/2 hour every hour. i run mine 15 minutes on then 15 minutes off. but i don't have to worry about sun on roof after noon as big shade tree covers it from noon till late in the day.
my old garage and carport was recently redid so it is almost fully insulated. got to put a drop ceiling in and insulate the old carport section then fully insulated. (i used blow in insulation and used twice as much as what was recommended for standard installation so is about a r-64 value
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