Had a 1974 GE Weathertron heat pump in my last house in Upstate NY. Only ever replaced the condenser fan (after 12 years). Reconfigured it to work as AC only in 1990 and the current owner says its still going strong!
my parents Rheem split system was installed in 1972 if i remember correctly.
NEVER been touched. Capacitors still good.
still full on refrigerant. Contactor could probably be changed but is still operating.
I will be installing a new Rheem split system and ducting next month cuz I'd imagine
those units are like -5 SEER
look at labels on the back of the condenser, they're still intact. you could even read the inspectors initials on the green label when I bought it July(?) 2010. http://imageshack.us/f/526/img2158x.jpg/