Pressures will be much lower when it it cold. If you put too much freon in things can get ugly such as liquid in the compressor pistons or starting a leak.
I like to charge systems when it is warm such as 70 degree to 100. But get paid to charge home and light commerical systems down to 40 degrees.
Don't think about charging the car unless you have an ambient air temp/pressure chart. You want to hit the target just right. Too little freon
poor cooling/freeze up, too much less coolingalso and asking for big repair issues.
John
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