Hi I want to ask if is it possible, it is just hypothetical now

I want to use cheap air>water heat pump (designed for pool heating) to prepare hot water and heating house (45 *C 110 *F should be fine)
It could work well down to 5-10 *C (40-50 *F), it have no defrosting
I have an idea to add plate heat exchanger to evaporator (between expansion valve and current evaporator) and "heat" it with ground collector (which gives stable water temp 0-5 *C (30-40 *F) whole year)
So at low temperatures it will work from ground and with rising outdoor temperature will use more and more air evaporator to increase efficiency

Do you thing could it work ?