A replacement defrost sensor or outdoor coil temperature sensor for a residential heat pump is an affordable component, typically costing between twenty and sixty dollars for the standalone part when purchased retail or through an HVAC parts distributor. If you choose to hire a professional HVAC technician to diagnose the heating fault and replace the sensor, the total service bill generally ranges from one hundred and fifty to three hundred dollars, which includes the diagnostic service fee, travel time, and labor costs. Universal defrost sensors are widely available, but matching the exact resistance curve and electrical plug configuration for your specific heat pump model is critical. You can verify successful replacement when the system accurately initiates and terminates defrost cycles.
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