As an average, how much delta do you have between incomming air and what you get at the registers?. And if you ever measured you anemometer speed. (I know that's relative to your duct and register size), but just for a comparison. I just replaced my old r22 freon hp with whatever it is now, and I'm seeing a difference. I did upgrade from a 31 to a 36 btu so I expected more volume, but not this much of a temp delta. My numbers are: incomming air is 68, and register air is 85. My old setup was 68/95. I'm getting more volume so it should compensate ..old registers average about 500 where new is 700. (Using anemometer) Cost of running... old unit pulled 10 amps, this one is actually a bit less at 9. Bigger / lower delta, but cheaper to run. As close as I can tell my incomming water temp is 65 outgoing is 57. (Not sure why my incomming well water is 65, it should be 59.. (at least that's what I measure with a meat thermometer at the kitchen tap ) I'm using an infrared thermometer (like they use on your head at the dr... who nows how accurate, but the delta should be the same) to get my Temps at the hp.