- Joined
- Nov 25, 2015
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- 8,385
I'm sure it does kill more. Again I have a propane backup, so I'll get that sometimes.Variable compressor should help a bunch in that case. An extra half ton isn't a huge difference. Air to Air, guessing you'll pay an efficiency penalty on the hottest and coldest days of the year. But those will be offset by gains during more moderate days on both ends.
There was a fully variable unit available when I did this 2 stage unit. Efficiency improvements while better were small, so cost wise it didn't pay. Knowing what I know now, I might have gone that path for variable speed during cooling.
The one downside I've heard of for a heat pump over propane/oil, is combustion would tend to disinfect air. Blowing that air over hot tubes kills microbes, etc. No evidence to back that up, however. Just something someone mentioned to me once.
We all see how it goes, I can always add an air purifier later. More money than installing it now. But I don't want to pay until I know for sure.