If the Vapor aspect works well then this might make air source heat pumps tenable in cold countries. The current crop here in the UK are costing home owners a fortune as the 3-4 kw multiplier drops to 1 below 0degC or so and hearing becomes horrifically expensive. I know a chap who was paying £1,200 a month to hear is home at the worst of this winters cold and the energy price jumps we have here.