A heat pump here has to manage summer heat and real winter cold
Clyde has a long cooling season, so a heat pump spends much of the year moving heat out of the house. That makes outdoor coil performance and unobstructed airflow important. Dust and debris around the outdoor equipment reduce how well the coil releases heat, making summer cooling harder work for the system.
Winter operation deserves equal attention. On moderate days, a heat pump provides efficient, steady heat. During a hard freeze, it has less heat to draw from the outdoor air and its heating capacity drops. Auxiliary heat may take on more of the load, so a replacement needs to be considered for the coldest conditions as well as for summer cooling.
Frost also puts defrost operation and drainage to work. A heat pump needs to clear frost from its outdoor coil so it can continue moving heat. When duct capacity does not match the equipment, even a correctly operating heat pump cannot deliver its intended comfort through the house. We take those parts of the system into account when assessing repair or replacement work.