Question

the coefficient of performance (cop) is
o variable with outdoor temperature
o the point at which the heat loss from the house exceeds the output capacity of the heat pump
o the point at which heat loss from the house exceeds the input capacity of the heat pump
o the seasonal energy efficiency of the system
o the ratio of the heating capacity to the cooling capacity

Explanation:

The coefficient of performance (COP) of a heat - pump system is variable with outdoor temperature. As the outdoor temperature changes, the efficiency of heat transfer and the work input required for the heat - pump operation change, thus affecting the COP. Other options do not correctly define COP. COP is a measure of the efficiency of a heat - pump or refrigeration system and is not related to the points where heat losses exceed capacities in the ways described, nor is it the seasonal energy efficiency or the ratio of heating to cooling capacity.

Answer:

variable with outdoor temperature