Heat pumps are essentially mature technology. There's not much complicated about them.
The recent rocketing price of electricity has messed things up. You can get 4 to 1 leverage on a heat pump, 4 kWh out for 1 kWh in. With gas at 3p and electric at 12p, that just about balances. With gas at 4p and electric at 20p it's out of bed.
It's insulation and controls that are going to save me money, not the heat pump.
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