My furnace gay said he can not install coolant into the new a/c condenser because the outside air temp had to be 75 degrees. Is that true?

No not exactly

As long as it is above 60 it can be done, but it is easier if it is hotter.

Quote:

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Originally Posted by oletiger

my furnace gay said he can not install coolant into the new a/c condenser because the outside air temp had to be 75 degrees. is that true?

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When I was in HVAC tech school,, that is what we were taught, but with a little more experance we learn to get around that problem

Most of the charging charts for the a/c system start with a ambient temperature at 60 degrees.