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25 States Agree To Quadruple Number Of Heat Pumps In America (cleantechnica.com)
submitted 2 years ago by [M, B] to c/technology@lemmy.world
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25 States Agree To Quadruple Number Of Heat Pumps In America::The US Climate Alliance met in New York City this week to explain the benefits of heat pumps, including better health for American families.

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[–] 22 points 2 years ago (5 children)

Direct electric heat is very efficient. Practically 100%.

My understanding is that you would only need the aux source during extreme cold. So very rarely.

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  • [–] 12 points 2 years ago (1 child)

    Right - in fact, from my knowledge, heat pumps only see use over direct electrical heating because they are effectively more than 100% efficient. They move more heat energy from outside to inside than they use in the transmission.

    The breakdown between gas and electric heating isn’t necessarily a matter of how efficiently the energy is used once it gets to the home, it’s how expensive it is to get it there in the first place. In a lot, if not a majority, of places, it’s much cheaper to get gas piped in than it would be to pay for the same amount of heating via direct electric resistance. Heat pumps change the equation because they can make electric heating in places that don’t get outrageously cold economically competitive with gas.

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  • [–] 7 points 2 years ago (1 child)

    My heat pump is around 300% efficient. It adds 3X the energy into the house than it spends by stealing that energy from outside.

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  • [–] 1 point 2 years ago (1 child)

    Except when it's very cold outside, which is what was discussed here. Heat pumps are great (have one in my home), but it might not be ideal in very cold areas, especially if electricity prices are high compared to other energy sources.

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  • [–] 3 points 2 years ago (1 child)

    You need to be in a very, VERY cold area for that to matter. While these places exists, I'm sure it's not the case for a lot of the states I've seen marked in that article. Heat pump can heat the inside of your house even when it's freezing outside.

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  • [–] 4 points 2 years ago (2 children)

    That's a misleading number. In most other cases where we are using electricity--motors, CPUs, lighting, etc--we consider the heat generated to be inefficiency. It might be more accurate to say that electric resistance heating is 100% inefficient.

    If you're using resistance heating to heat your home, using electricity that's originally produced by natural gas, then you're using more natural gas compared to burning that gas for heat directly in a home furnace. Now, electric resistance heating can be a choice when it's fed by clean electrical sources otherwise. Even then, though, you would prefer a heat pump if possible.

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  • [–] 1 point 2 years ago

    Icing conditions can also be a factor; freezing rain in the high 20's F (~-4C for those who can't F) will build up a layer of ice on the outside unit especially since it's already the coldest thing around. That ice prevents air from circulating through, so it loses effectiveness. Running the strips for about a half hour or so, then running the air conditioner for about a half hour will defrost it quite effectively and restore it to efficient operation. It is my understanding some systems even do this automatically.

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