We had a Tranquility geothermal installed in our house when we built it 4 yrs. ago. 27 SEER and the whole house (2400 sq. ft.) is electric.
Highest electric bill was last month, just over $300.
Good lord! I pay under $100 a month year round. And the AC unit is 8 SEER circa 1978. (I need to replace it). House is about 24-2500 sft.
Propane heat, water heater, dryer and stove and spend about $50-60 a month on that with about double that when it was -33F for a couple nights and the month had -18F highs.
Also burned up 6-8 full cord of wood that cost about 30 bucks for saw blades, fuel, and a couple cold ones.