Located in Ontario.
We manager our TOU pretty well and have averaged $0.12 kWh (induced all extras, taxes, distribution etc)
House is 40 years old with new windows, doors and R50 in the attic.
Current heat pump is air-source electric.
I believe we were well over 100 kWh a day in Jan.
So consensus is that keeping these heat pump with electric aux is better than switching th aux to propane.
Why would ALL the new homes in our area be going with what appears to be 100% propane furnaces? Not electric furnaces with/without heat pumps? All these people were scrambling for propane when we had a cold spell around Christmas.
Electricity in ontario has a distribution component that's also per kwh which adds quite a bit to the bill. You have to go to your utility's website to calculate the true variable rate.
It could be an extra 2.5 to 5 cents per kwh.
Our electricity is super expensive which is why we don't use heatpumps much. The use of strip heat offsets savings compared to propane only.
They don't have enough capacity to begin with, being sized for a/c and it drops as it gets colder outside. Most traditional air source heatpumps may start needing supplemental heat from between 25 to 40f outdoor.
There are heatpumps out there which can maintain full capacity down to -20c or so and almost completely eliminate the use of aux heat. In canadian studies, the effective efficiency has been shown to be around 200% over the entire heating season, so cheaper than propane despite the high cost of electricity.
A traditional air source heatpump relying on aux heat may be 120 to 150% over the entire heating season.
The problem is, they're extremely expensive.
The one I know of is made by Mitsubishi; it's call "zuba".
You're right in that use of a programmable thermostat with heatpumps raises consumption - set it and forget it.
Check your actual kwh per day on the bill. At 100kwh, unless your heat loss is really high, your heatpump may not be working right.
What size and shape is the house? What's the tonnage of the heatpump?