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I have a better idea
One system that is both an Air conditioning system that uses waste heat to heat water. And uses waste "cold" from heating water to cool house.
I can get you half way there with a heat pump water heater.
Thats the point, they both use the inverter based heat pumps, they even use the same refrigerant. By no-one builds one that shares the same unit, so they both dump waste temperature differential into the outside air.
A lot of newer water heaters use essentially an air conditioner type system to heat the water and blow cold/cool air away from it. Obviously only useful if you have your water heater in an area that can make use of said a/c, but I did and it was glorious.
Theoretically you could use a heat pump to heat water that would generate "waste cold", but heat pumps typically don't get nearly hot enough to heat water as much as a gas water heater does. I suppose one could be made but it would be very difficult, I think. It would need to use the ambient air in your house and suck enough heat out of it to heat your water, and if your house is about 72°F / 22°C and you want water at 130°F / 54°C (which is pretty typical) that seems like a challenge, especially since water is so much denser and has a higher heat capacity. I have a portable A/C with a heat pump and it starts to struggle to heat my apartment once it gets down to 45-50F outside and it struggles to cool once it gets above 95F.
GE currently sells a heat pump water heater on the market, I'm not sure if it uses resistive heating to supplement the heat pump
Your AC may be undersized if it doesn't perform well in hot weather, also unfortunately many heat pumps aren't optimized for extreme cold weather performance. Some are, it's definitely not a failure of heat pumps in general, but you'll only find those as permanent install units and they're usually only sold up north.
Mine is general purpose, I suppose. I'm gauging its performance based on the temp of the air coming out of the unit, I think the room I'm using in is within range of it's cooling/heating capabilities. Didn't realize GE was making water heat pumps, nice.
Check if you can get some shade on your exterior unit. Also check that the area is well ventilated.
And as always, insulation is king.
I'm renting, I'm doing the best I can with what I've got. The entire unit is inside and I have a huge tube going to a panel in my window. It works surprisingly well.
Yeah, those units have their limits. Better than nothing though.
Its all just about the relative compression ratio of the refrigerant. They make heat pump based water heaters that have external units that operate identically to air conditioners running in a heating mode.