Refrigeration & Air Conditioning Mechanic Red Seal · Question
During a seasonal performance check, a technician measures the indoor return air temperature at 21°C and the supply air temperature at 33°C with the heat pump operating in heating mode. The auxiliary heat strips are confirmed to be off. What does this temperature differential suggest about the system's operation?
A temperature differential of 12°C (33°C - 21°C) across the indoor coil in heating mode is generally indicative of proper heat transfer and efficient operation
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Question: During a seasonal performance check, a technician measures the indoor return air temperature at 21°C and the supply air temperature at 33°C with the heat pump operating in heating mode. The auxiliary heat strips are confirmed to be off. What does this temperature differential suggest about the system's operation?
Answer options: ✅ The heat pump is operating efficiently and delivering adequate heat.
- The heat pump is undersized for the current heating load.
- The outdoor unit is likely in a defrost cycle.
- There is an airflow restriction across the indoor coil.
Correct answer: The heat pump is operating efficiently and delivering adequate heat.
Explanation: A temperature differential of 12°C (33°C - 21°C) across the indoor coil in heating mode is generally indicative of proper heat transfer and efficient operation for many air-source heat pumps, meaning it is meeting the heating demand effectively.
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