MakeHeat

Up north, the ground source heat pumps are still more prevalent, and we’re hoping to see more of the design efficiencies incorporated into them as well.  The upside of the air source heat pumps is that you don’t have to dig up your yard.  The downside is when the temperature extremes kick in.  With the ground at a constant 52 degrees, heating and cooling is more efficient during the summer heat and the winter cold.

“… There have been many recent developments in air-source heat pumps. The modulating, multistage output rotary compressor design is now available in heat pumps. This design produces high efficiencies for both heating and cooling (HSPF of 10 and SEER of 22). What this means is you can get $2 to $3 worth of heat for each $1 on your utility bills. …”

via Heat pumps are popular and efficient – St. Petersburg Times.