A replacement defrost control board for a residential heat pump typically ranges from one hundred to two hundred and fifty dollars for the standalone part alone, depending on whether you purchase a universal aftermarket model or a specialized OEM board designed for your specific HVAC brand. If you hire a professional HVAC technician to diagnose the system and install the new board, the total service cost usually falls between two hundred and five hundred dollars, covering diagnostic labor, travel fees, and technician expertise. Universal replacement boards offer a cost-effective alternative for older systems, while high-end inverter heat pumps require proprietary OEM boards. You can verify that the repair was successful by observing a complete heating and defrost cycle where the board accurately times out and returns the heat pump to normal heating operation.
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