What is the minimum accepted air flow (in cabin feet per minute) over the indoor coil on a heat pump (per ton)?

The minimum accepted airflow over the indoor coil on a heat pump is 400 cubic feet per minute (cfm) per ton. This figure is significant because proper airflow is crucial for the efficient operation of heat pumps. An airflow of 400 cfm per ton allows for optimal heat exchange, which is essential for both heating and cooling modes of the heat pump.

In the context of heat pumps, airflow directly affects the system’s capacity to move heat. If the airflow is too low, the heat pump may not effectively absorb or release heat, leading to decreased comfort levels and increased energy consumption. Therefore, maintaining a minimum of 400 cfm per ton helps ensure that the system operates efficiently, reducing wear and tear on the equipment while maximizing performance.

The other values presented are lower, which could lead to underperformance of the heat pump system, potentially causing issues like insufficient heating or cooling and longer run times, which can result in higher energy costs and reduced system longevity. Therefore, adhering to the standard of 400 cfm per ton is essential for optimal heat pump function and efficiency.