Ah, 39PSI, 39degrees, what's the difference?

My recommendation is to wait until it warms up a bit more and see if the performance is adequate. You need more heat load to really test the a/c system. If it's not cooling like it used to, then top it off.

The only way to accurately charge the system in moderate temperatures is to evacuate it and then put in a full charge by weight.

- JimY