Commercial Heat Pump Repair Service: Responding to a commercial client's report of inconsistent heating performance, I performed a thorough diagnostic on their rooftop heat pump system. I discovered that a failing reversing valve was preventing the unit from switching smoothly between heating and cooling modes. After replacing the valve and inspecting the refrigerant levels, I recalibrated the system to ensure balanced operation. The heat pump now delivers reliable, energy-efficient performance throughout the facility.