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I believe my heat pump does not try to warm my house when the outside temperature is below 45 degrees F. Below a certain temperature, they just work way too hard. Bear in mind, they are trying to take heat from the outside and put it into your house. Like the OP said, when the outside temp is 36 degrees, the system struggles. It probably should move to electric heat at that temperature.
Yes, many systems are built these days to use geothermal. The "coolant" runs through hoses in the ground. The contractor drills holes, line drilling a well, then puts a hose 'loop' in the hole and fills it up with grout. The ground temperature at the bottom of that hole might be 50 degrees, even when the outside air temperature is 20. These systems work well.
So does gas or propane "backup" heat, for when it is really cold outside.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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