Repair or Replace Heat pump?
I have an 11 year-old home with the original Lennox Heat pump model:
12HPB24-8P paired with CB29M-21/26-1P.
From what I can tell, this is a 12 SEER, 2 ton unit. It has a bad expansion valve that will need to be replaced and inspection does show some rusting on the coils but there are no leaks yet. Because of R-22 going sky high, I have been quoted a cost of over $1000 to replace the expansion valve. Is it worth repairing, or given the age and the rusting coils, would I be better served to replace it? I may be looking at having to replace it any way in a couple of years.
To add to this, I've been doing research and it seems this unit is undersized for my house. (A common problem in my neighborhood apparently) It's a 2 story home with a total of 1800 square foot in southern Indiana. From what I have found through research, it seems that my house should actually be using a 3 ton unit, but I have not had anyone come in to give me an estimate on a new unit and I know there are a lot of factors that are considered.