Is it worth spending the extra money for a high efficiency furnace if it is going to be used as back up?
We live in a two-story, 100+ year old house in northeastern Maryland and are looking at doing two systems. We also have a quote for a single system.
Two-systems Option 1: Lennox G61 MPV-36B-45 gas furnace, XP16-024-230 2-stage heat pump, coils are CX34-36B-6F and CH33-36B-2F.
Two-systems Option 2: Lennox G61 MPV-36B-45 gas furnace and single stage heat pump XP13-024-230, coils are CX34-36B-6F and CH33-36B-2F.
Since these are two separate systems (each floor ~1000s.f.) could we step down a grade with the furnace and still have an efficient set-up?
Single system Option: Lennox G61 MPV-60C-90 gas furnace, XP16-048 heat pump, coil CX34-60D-6F.
We currently have an oil furnace and will be purchasing a 500 gallon underground propane tank in addition to installing a Rennai tankless hot water heater, so this project is getting quite pricey.
I want efficiency, but I also don't want to break the bank. Any suggestions would be greatly appreciated!