My condo uses a water source heat pump. It took me more than a few minutes to understand, but it’s so sensible. The building runs water in a loop through all th

My condo uses a water source heat pump. It took me more than a few minutes to understand, but it’s so sensible. The building runs water in a loop through all the units. An individual unit’s heat pump can either add energy to or take energy from the water. If the water is too hot it can be cooled in a cooling tower on the roof, and if too cold it can be heated in a central water heater. The unit lives in an interior closet and there is no outdoor component, yet it’s central A/C.