A friend of mine instaled an air to water system at his place,
wich is hooked up to his floor heating. He's still heavily remodeling the house, so he can't yet comment on how effective the system is.i haven't seen the setup but the exterior hardware looks like an AC. he said the system could still derive energy from the air as low as -15 degrees celcius that 5 degrees farenheid and for every watt of electricity it delivers 4watts of heatenergy. the downside is it costs about twise as much as a conventional natural gass boilers and it's more suited for pasive houses with limited additional heating required. still i'll be looking into this system when i'll have to decide how to heat my place
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