this post was submitted on 11 Mar 2024
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Yes, heat pumps slash emissions even if powered by a dirty grid | Installing a heat pump now is better for the climate, even on U.S. electricity generated mostly by fossil fuels. Here’s why (www.canarymedia.com)
submitted 8 months ago by [email protected] to c/[email protected]
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The article doesn't go into it, but a key advantage they have is that heat pumps move heat, rather then trying to generate it. So they can move a lot more heat into your house than would be generated by running the electricity they use through a resistor. This makes them effectively more than 100% efficient (the exact amount depends on temperature) as compared with burning a fuel or resistive heat.

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[–] [email protected] 7 points 8 months ago (1 children)

Notable, but outside of very cold climates (which I think I feel safe describing Saskatchewan as being), heat pumps are a LOT more than 200% efficient. In mild climate, they can be 2-4X that.

[–] [email protected] 2 points 8 months ago (1 children)

Definitely, that's why I say the seasonal heating efficiency is based on heating-degree-days of the location. I'm not sure they'd get to 2-4x 200% efficient, though. 350% might be more reasonable.

[–] [email protected] 3 points 8 months ago (1 children)

It gets hard to say because COP varies with climate. But even in SEER ratings, 17-20 are pretty much the norm for modern systems and I have seen as high as 23. That translates to a 4-4.5 COP in an average climate.

But those COPs get higher the more mild your climate -- I am somewhere with quite mild winter where we only get a hard freeze once or maybe twice a year, and generally winter low temps are in the 40-50F range.

I believe the theoretical max efficiency for a heat pump is something like 8.8 COP. In a mild climate like mine, where most of the time if your heat is running it's to heat to ~70ish from an ~50ish outdoor temp, you're should be getting a lot closer to 7 than you are to 2.

[–] [email protected] 1 points 8 months ago

I'm pleasantly surprised. Right, sometimes I forget that most people don't live in a deep freeze like Saskatchewan.