Forums DIY Ground Source Heat Pumps Reply To: Ground Source Heat Pumps October 25, 2018 at 2:44 pm #445 housemouse 10 Posts If their seasonal CoP is to be believed they seem really impressive. Can you install underfloor heating. If you have underfloor you can normally have a lower flow and return temp and thus a higher COP. What is the DHW provided by? I think there might be noise issues as well from the condenser.