I have a home built in the early 70's with a General Electric Central unit. The house is total electric, and the heater has three sets of coils, two are primary, and the last is called auxillary on the wiring diagram. I have calculated from my electric bills for the past year, that I use around 7600 kw of power for heating and cooling. I took the fall and spring months as normal useage, then deducted the excess over that for the remaining 9 or ten months. I would like to install a new 20 seer heat pump with a 3 ton a/c. I have a 1500 square foot home. My current unit is running fine, just know it won't last forever. I calculated I am using around $485 bucks a year for heating and cooling, and don't know if I will save much more than that. Do I run my unit to failure, or replace it?
Thanks for any replies.