That only applies if you're only going to get less than 1 year of use out of a heat pump. A heat pump has an "embodied CO2" of 1.7t, which is about the same a

That only applies if you're only going to get less than 1 year of use out of a heat pump. A heat pump has an "embodied CO2" of 1.7t, which is about the same as the annual CO2 emissions of a gas furnace.