This winter I installed a Mitsubishi Air Source Heat Pump (27 SEER) in my home. I was told they will work down to   -13 degrees F, My system worked perfect down to my lowest temperature of -4 degrees F. Airsource HEAT PUMPS ARE GOING TO CHANGE THE WAY WE THINK ABOUT HEATING AND COOLING.

They are cost-effective, it costs less to operate than Oil,  Propane, or Electric.........They Heat and Cool.

They are clean and quiet.

One day installs.

The Numbers.
To put 100,000 BTU of energy in a home it costs.
$5.00 with electric resistance heater but only $1.70 with an ASHP.

Same with COOLING it is 3X LESS to run an ASHP (27seer) than a 9 seer window unit.