Quote:
Originally Posted by blender
Are you sure the heat pump is sized correctly?
If it is oversized it will cycle and not run efficiently which can waste a lot of energy.
Also, you want to be sure that you are keeping your thermostat set at one temperature. If your wife (for example) adjust the T-stat based in how she is feeling hour-to-hour it will kill the efficiency.
Oversized heat pumps are the major cause of inefficiency.
The best gas furnace will be 96% efficient under factory testing (probably 90% real world), so you are wasting 10% right out of the gate. Keep that in mind with your calculations.
Electric heat is solid state, so you are getting 100% of the power you put in. A well-sized, properly functioning heat pump can run at 300% efficiency. I doubt you would see that level of efficiency in real world conditions, but they can be significantly more efficient than even regular electric heat.
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2200 kWh isn’t terrible, in fact his efficiency is pretty great considering the low ambient temperatures reducing heat pump efficiency. By comparison I used 17GJs of gas last month. That’s 4700 kWh of energy from gas plus my power consumption. I still have my 80% ME furnace but even if you consider the efficiency of CCGT of 50% the gas consumption using the heat pump would still be substantially less than heating conventionally.