Potentially looking at replaceing my upstairs unit.
Upstairs = 3.5 ton 10 SEER aire-flo ~1100sqft
Downstrs= 3.5 ton 10 SEER aire-flo ~1600sqft
2700sqft, Phoenix, AZ.
If I end up replacing the upstairs unit it would be with a 13 or 14 SEER 3.5 ton unit/air handler, the whole thing. Single stage likely same as before.
The way I understand it, it should not negatively affect the other unit. They both blow the same 3.5 tons (granted the older unit may blow a little less), just the new unit would do it with less energy.
Would this be a correct assumption?