>Aren't air pumps less power efficient then ground ones? Not modern ones. When outside temperature is above 5C, they're actually more efficient. > Also, is it

>Aren't air pumps less power efficient then ground ones? Not modern ones. When outside temperature is above 5C, they're actually more efficient. > Also, is it possible for air pump to heat a liquid in pipes? I mean can I have air pump that provides heating to the floor? Yes, via a heat exchanger. This isn't new techonology, I have a 10 year old version of this warmning my house as I type: https://www.nibe.eu/sv-se/produkter/varmepumpar/luft-vattenvarmepumpar/NIBE-F2120-_-34 https://www.nibe.eu/sv-se/produkter/varmepumpar/luft-vattenv... >I know air pumps only as air conditioners and they just blew warm air around, which is not that comfortable if you are just where the warm wind blows :) The pump linked above connect to the water based heating system in my house. Works like a charm and I heat ~260 m2 (badly isolated) with 1500 kWh per month (wintertime)