Our panel system with 1,400 sq. ft. of floor and 450 sq. ft. of wall panels was operating between 85 degrees F and 110 degrees F throughout the last heating season with COP values ranging from 3 to 6, depending on outdoor temperature.
1 KWH = 3,412 BTU
At an average COP of 4.5 the heat pump extracts heat from the air at the rate of 4.5 X 3,412
BTU = 15,354 BTU per KWH of electricity input.
Based on average fuel cost in the greater Boston area: $.28 kwh electricity this translates into cost savings of:
BTU/Values
$3.75 gallon #2 heating oil 140,000
$3.50 gallon propane gas 91,500
$2.50 therm (100 cubic ft.) natural gas 100,000
32% over oil
52% over propane
27% over natural gas
That is not taking into account combustion losses of fossil fuels (at least 10%). 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.