Understanding how the interior heating system works

Janda2 said:

So basically in our MG cars we do have a heat pump set up to cool, like a fridge. A heat pump set up to provide heat is very efficient capable of producing more energy (heat) than it consumes. Cooling is the reverse, inefficient. Surely we just need the ability to run it in reverse mode, no need for another heat pump? (my ice maker can reverse as can air to air heat pumps). Am I misunderstanding?

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siteguru said:

That's interesting info re. the ER. But @Joningy's Trophy LR will almost certainly not have a heat pump - if it's a UK-spec car.

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siteguru said:

That's interesting info re. the ER. But @Joningy's Trophy LR will almost certainly not have a heat pump - if it's a UK-spec car.

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siteguru said:

Yes - the air conditioner (which is a heat exchanger rather than a heat pump). A heat pump is like A/C in reverse.

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MDWMG said:

I've said it before, and I'll say it again - my UK MG4 Trophy ER has a heat pump.

I don't know whether it has a PTC heater as well as the heat pump.

The type certificate says it was built September 2023, and I bought it new through an MG dealer last year.

After earlier comments on this thread, I removed the black plastic cover under the bonnet to take a closer look. All the visible components are those shown on pages 243-244 of the Service Repair Manual (aka Refit and Remove Manual), which are different from the parts of the non-heat pump a/c on pages 241-242.

I only found out that it has a heat pump when investigating whether to buy a third-party frunk. There are two types on the market, and I discovered that the ones for cars without a heat pump won't fit my car.

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