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What is the real story around heat pumps?

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Siwastaja:

--- Quote from: coppice on February 23, 2024, 07:53:12 pm ---There are many millions cooling homes in hot climates, but very few of those are reverse cycle and can heat a home.

--- End quote ---

You would be wrong here. While there still are very cheap cooling only window units, and of course the warmest climates mostly do with only cooling, the hugely popular split type air conditioner was originally invented in 1980's to be a heating (and cooling) device, and this type is literally everywhere (except UK) since late 1990's.

Even in relatively warm climates you need heating during winter months, and quite obviously decent COP can be easily had when "winter" means +5degC not -10 or -30. Such split type air conditioner offers both heating and cooling, both being something people need. It's an optimization to the old days of burning something for heating and using window type cool-only air conditioner during summer. Rest of the world took this step a decade or two ago. Africa included.

nctnico:

--- Quote from: coppice on February 23, 2024, 07:53:12 pm ---
--- Quote from: Siwastaja on February 23, 2024, 07:45:34 pm ---In the end, UK remains one of the few outliers where natural gas is 1/4th of the price of electricity. But most of the Earth's population uses heatpumps just fine, because they are hugely popular in most of Asia.

--- End quote ---
So, where in Asia are heat pumps popular for heating? There are many millions cooling homes in hot climates, but very few of those are reverse cycle and can heat a home.

--- End quote ---
I have a feeling people will want to have heating in the parts of Asia close to the north pole:


My previous and current split AC systems can both heat and cool. I got them for cooling as heating makes no financial sense but the heating option is standard on all units they sell here. And even then, I'd favour underfloor heating over an air-to-air unit.

pcprogrammer:

--- Quote from: coppice on February 23, 2024, 07:53:12 pm ---
--- Quote from: Siwastaja on February 23, 2024, 07:45:34 pm ---In the end, UK remains one of the few outliers where natural gas is 1/4th of the price of electricity. But most of the Earth's population uses heatpumps just fine, because they are hugely popular in most of Asia.

--- End quote ---
So, where in Asia are heat pumps popular for heating? There are many millions cooling homes in hot climates, but very few of those are reverse cycle and can heat a home.

--- End quote ---

Did you not see the news lately, -52 in China couple of day's ago.

Maybe a heat pump won't help much with these low temperatures, but as nctnico showed, Asia has some very cold parts.

Someone:

--- Quote from: coppice on February 23, 2024, 07:53:12 pm ---
--- Quote from: Siwastaja on February 23, 2024, 07:45:34 pm ---In the end, UK remains one of the few outliers where natural gas is 1/4th of the price of electricity. But most of the Earth's population uses heatpumps just fine, because they are hugely popular in most of Asia.

--- End quote ---
So, where in Asia are heat pumps popular for heating? There are many millions cooling homes in hot climates, but very few of those are reverse cycle and can heat a home.

--- End quote ---
Japan and China. I'll assume also Korea but would need some other verification of that.

tom66:
A regular-old gas boiler will struggle with -52C.  For one, the condensate pipe will freeze up quickly, and will require frequent defrosting, but also I doubt the output power of most normal systems could keep up with such extreme weather.

In those cases, wrap up warm and use local heating in addition to any central heating. 

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