Our panel system with 1,400 sq. ft. of floor and 450 sq. 1 KWH = 3,412 BTUAt an average COP of 4.5 the heat pump extracts heat from the air at the rate of 4.5 X 3,412BTU = 15,354 BTU per KWH of electricity input. During milder outdoor temperatures (40 degrees to 60 degrees Fahrenheit), the COP value will increase to 5 and 6, meaning another 10 - 25 % savings can be expected. Energy efficiency cooling ratings of EER 13 to 15 with radiant cooling panels can be expected, based on outdoor temperature conditions.