Can you mix a single stage and two stage furnace?
After going through the posts here, I am concerned that I am being taken for a ride...
The compressor shorted to ground on my 2.5 ton Rheem air conditioner, and since the equipment on my 30 year old, 2100 square foot two story house had never been changed, I started looking at a full system replacement.
Since the original AC was put in, there was a second Amana unit added for the upstairs and a second furnace. The Amana unit has been working fine.
The current units are:
Rheem Criterion II - 80 afue (couldn't find the model number no matter how hard I looked)
Rheem Classic X - RPKA030jaz
Amana Distinctions - CKL24-IL - 1.5 ton
The Rheem is the unit that failed. Proposed replacements are...
Trane XV80, 60,000 BTU two stage gas furnace with variable speed blower to replace the Rheem Criterion II
Trane XR15 1.5 ton to replace the Classic X
Trane XR80 60,000 BTU single stage 3-ton multi speed blower to replace the Comfortmaker
The Amana will stay.
I have a couple of questions.
1. is it a good idea to mix a two stage and single stage furnace?
2. is it a good idea to leave the working Amana unchanged?
I know the Comfortmaker is a dinosaur (the manual is actually a series of stone tablets), but it is in the garage ... should THAT be the two stage if I only have one two stage?