Water source or ground source heat pumps are among the most efficient means of heating and cooling available today. If you own a geothermal heat pump system in De Soto, MO you must protect your investment by maintaining a proper inspection and service schedule to ensure long and trouble free operation. B.F. Mahn & Sons, Inc. is uniquely qualified to provide geothermal heat pump service in De Soto, MO. Our service technicians have the experience and equipment necessary to professionally maintain or repair your HVAC systems.