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I think these will make sense eventually but if most of my electricity in winter comes from gas anyway, is changing where the gas is burned really better?
Yes, on two points. 1) heat pumps are more than 100% efficient in most conditions. Because they are moving heat, rather than generating it, they can add more heat energy to your home than they actually consume. 2) mix of sources. As you said, even if most of your electricity comes from gas plants, that means some can or does come from renewable sources or nuclear. This makes it much easier to transition to even more renewables, since the consumer side doesn't need to change anything as gas plants are phased out. It's future planning with immediate benefits from point 1.
Point 1 can be a bit complex, since in extreme conditions air source heat pumps may rely on resistive heating which is only 100% efficient. Alternatives like ground source HPs don't have that problem, but they are suited to fewer areas.
Thanks. My climate is relatively mild so I don’t think resistance heating will be necessary. Extreme lows could get to the low 20’s but only for brief periods, so I think heat pumps should still work in such conditions?
Our heat pump didn't really kick in the resistive auxiliary heat until temps were well below 0°F, but humidity also plays into that. It wasn't ever running the resistive heat exclusively.
If sized correctly, heat pumps also don't really like setbacks in the winter. Just set the thermostat to whatever and leave it -- don't have it cool down at night and warm back up in the morning.
I like to be warm at night anyway so I don’t have a problem with that.