Reply to HVAC replacement - looking for advice from those who have BTDT

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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]I second the comment about variable stage (or multi-stage, or modulating). In my experience a modulating gas furnace and two-stage air conditioner made a big difference in comfort. Presumably heat pumps are available with similar.[b] It eliminates the mentioned concerns about the system being oversized for some seasons, because it changes its capacity as needed[/b].[/quote]

I am not sure if this is true. My understanding is you lose the efficiency of the variable stage in the summer when it is oversized. Since it is oversized it can't run at the low level.that you actually need so it will shut on and off like a single stage. In addition to costing you more in electricity bills it won't do as good s job removing humidity.[/quote]

I didn't mean to imply that proper system sizing doesn't matter. I meant that caveats about heat pump capacity in summer vs. winter [b]aren't relevant[/b], because the system has more ability to adapt itself to conditions.[/quote]

I'm sorry, I'm not following. You are saying it's "not relevant" if a variable stage system is properly sued for heating but oversized for cooling? Why not? You are paying so much for the variable stage but o let getting the benefits in the winter.[/quote]

If I understand what you’re saying, I guess the solution is a heat pump with more than 2 stages, or an inverter heat pump which is in effect infinitely variable. [/quote]

You are assuming that an inverter heat pump's capacity can go all the way down to zero, and that's not accurate.

https://www.linkedin.com/posts/allisonabailes_can-you-oversize-a-mini-split-heat-pump-activity-7105132985556889600-d5Ss?utm_source=share&utm_medium=member_desktop[/quote]

On the 2-stage A/C I had in my previous home, 1st stage capacity was 2/3 of 2nd stage. So if a unit was oversized, but could go down to 30% of full capacity, then it could have a 1st stage with a ratio similar to my A/C's. If you're mainly concerned with heat pump overcapacity during heating season, then the BTU output of the stages of a 2-stage gas furnace would be more relevant. I don't know what that is, because I had a modulating gas furnace.[/quote]

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