this post was submitted on 11 Mar 2024
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How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world. About 1C of total warming. Second chart: about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability. Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases. About 0.5C of cooling with large error bars from SO2.

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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 6 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] 5 points 6 months ago (3 children)

Can you convert an existing AC system to do both and save money on getting a whole new system installed?

[–] [email protected] 3 points 6 months ago

You have a furnace that provides heat, air handler that moves the air, and compressor that forces heat in a certain direction (inside to outside in the case of AC) with coils in the air handler to make use of that (re)moved heat.

Heat pumps have several features that make them a bit more than backwards AC, like defrost systems, VFDs and often dual-fuel controls. If it snows where you are, you'll also want it off the ground. So, best to get a new system.

As another said, you might be able to reuse the coolant lines and coils in the air handler. It might not be a bad idea to keep the furnace for backup when it's extra cold.

[–] [email protected] 7 points 6 months ago (1 children)

It's probably not worth it. If you have a system more than 10 years old, then you're probably going to have to replace the accumulator as well if it uses a different kind of refrigerant. It's likely cheaper to buy a whole unit and furnace than messing with it.

[–] [email protected] 2 points 6 months ago

What about a new system? Had the AC compressor replaced last year but not the gas fired furnace due to cost lol

[–] [email protected] 3 points 6 months ago

I believe so but you need a new compressor - the heat exchanger in the house can stay the same I think.