A/C CHARGES YESTERDAY WITH FREON STILL NOT BLOWING COLD AIR

Bought car recently. The a/c was very cold the last couple of days not as cold, cool at best. Took it to jiffy Lube the charged it with freon as they said it was a bit low.

Now the car blows warm air when stopped and blows cool air when driven (not really cold though). Jiffy lube saw that and said the condensor may be on the way out, but I'm not sure I trust their judgement I'm hoping it is something else that won't be as expensive. Haven't checked any fuses not sure where they are and don't have a manual.

Any idea as to what the issue may be?

Would really appreciate the help.

George.