Originally Posted by
HVAC9900
The air source with gas back up is very common, most manufacturers have them available, just depends on what brand name rings your bell, and how efficient you want to be.
The company that installs and services the equipment is often as important or more so than the equipment itself.
Yes, I really like geothermal heat pumps,with a closed loop system( piping that will take the water from outside to inside and back again without constantly adding water) they are practical,if you are going to live in the home for at least 7 years(give or take).They can be used to heat domestic water too,which can make it even more efficient.
They have no outdoor temp limitations like an air to air heat pump does.
There are several brands out there, water furnace,climate master,bard,and I used to see a lot of tetco years ago but again installer/servicer is crucial.