PV2U said:
Just for kicks, added in the cooling days. Looks like things are tracking pretty well, peaks-and-valleys wise.
Taking a look at your completed chart, your usage does reflect a correct pattern for the heating and cooling period. The peeks and valleys of the heating and cooling do match the demand pattern, and the overlap of the HDD and CDD do match the low usage spots on the KWH graph line. Your winter usage is double the summer usage, and that points to the heat pump as a possible culprit.
You didn't mention what cooling method you use in the summer, do you use air conditioning, and what kind?
Do you have a pool that does electric for a pump in the summer?
Usually most people use more electric in the summer months for cooling, except if you have electric base boards, or in your case, a heat pump that possibly is drawing too much.
I don't have any experience with heat pumps, but I would expect them to draw similar loads as a central air conditioning unit similar in size. This may explain you "reverse" pattern of usage for a given year.
Checked my electric bills for the summer, and August had the most usage at 2057 KWH.
During the summer months we run 3 central air condensers/blowers for the house set to 72 degrees, and a pool pump and salt water chlorinator that runs 9 hrs. per day, 7 days a week, and still use about 200 KWH less than you do.
Your heat pump deserves a serious looking at, but I still feel that you have too much usage during the shoulder season. Please fill us in on your cooling habits for the summer.