I live in New Jersey, 1800sq ft 1950's ranch. We have 30+ year a/c GE condenser, Bard air handler, built and maintained by my father (retired commercial HVAC).
The system runs good. During the peak in July it maintains 76. It could use a coil cleaning and maybe some sealing in the return duct.
I'd like to upgrade the system, but cannot justify the payback at this point since it is working. However, at the same time NJ has some aggressive (approaching $5k) rebates to upgrade the system(s) which would offset it as well as interest free loans over 10 years.
To further compound the decision, we have a spare compressor, plenty of freon, blow motor, etc...so routine breakage is covered. The only thing that would hit my hard is a leak in the evap coil....(although I'd bet he'd make me send it out to repair).
I am interested in thoughts on upgrading vs not.