 One way to fix cold accumulation in the ground heat exchanger loop is to use ground water to cool the floors of the building on hot days, thereby transferring heat from the dwelling into the ground loop.There are several other methods for replenishing a low temperature ground loop; one way is to make large solar collectors, for instance by putting plastic pipes just under the roof, or by putting coils of black polyethylene pipes under glass on the roof, or by piping the tarmac of the parking lot.A further solution is to ensure ground collector arrays are correctly sized, by ensuring soil thermal properties and thermal conductivity are correctly measured and integrated into the design.