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Comment on Biden Administration Is Said to Slow Early Stage of Shift to Electric Cars

You sound informed, more so than I. The heat pump thing confuses me, and I’ve seen it a lot lately.

I was under the impression that the vast majority of homes were using a heat pump system. Seems like a no-brainer? Is this not so?

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Tak@lemmy.ml ⁨8⁩ ⁨months⁩ ago
It’s technically a heat pump but it only cools and can’t switch to heating the space. It’s a fucked up way the American HVAC system has done things for decades.

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dragontamer@lemmy.world ⁨8⁩ ⁨months⁩ ago
No.

Typical gas / coal plants are ~40% efficient. That means that if you do natural gas -> electricity -> heat pump, you only have 40% of the energy available to you. Yes, Heat-pumps then multiply that 40% energy out into “energy movement” rather than heating, but its a huge efficiency break.

If you instead run a pipe from the central source of natural gas and then burn the natural gas inside of a home, you have something like 95% efficiency (5% lost in the chimney).

Its only in the most recent decades have heat pumps actually become more efficient than burning natural gas inside of homes, because you have to factor the inefficiency of the power plant in your conversion. So today we’re finally in a position where modern, advanced, efficient heat pumps are worthwhile. But go back just 20 years ago and the math still pointed towards burning fuel inside of our homes as the most efficient solution.

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jmiller@lemm.ee ⁨8⁩ ⁨months⁩ ago
A increasing percentage of new construction gets heat pumps. Some replacement HVAC units make the switch, but there is still a large portion of people who won’t because of misinformation and/or stubbornness.

But, unfortunately, most existing residential systems do not use heat pumps, under 20% in the US I believe.

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mosiacmango@lemm.ee ⁨8⁩ ⁨months⁩ ago
Nope. Burning gas and direct electric heat of some sort are still the most prevalent forms of heating in the US, and often have separate cooling systems.

New building almost all use heat pumps because they were a no brainer, but a house built 60yr befofe the technology existed may still be using a very old heat source. Many people do not have the 20k+ to retrofit their current home with new technology even if it can save hundreds/month on their power/gas bill.

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