My central AC unit (10 year old Carrier system) was not cooling down the house. I noticed that the air coming off the condensor was not particularly warm. The repair guy showed up and checked the freon pressure and said it was ~20psi and should be at ~70psi. He said there was most likely a leak in the system and that he reccommended replacing the system for $4500.
This seemed excessive and I was wondering if there's a good way to check the system for a leak? In the meantime, I had him recharge the unit (something that he insisted would be a temporary fix). The house seems to be cooling down nicely.
Thanks in advance.