We have an oil boiler and wood stove. This year and last we added Mitsubishi hyper-heat heat pumps. The wood stove is great, and cheap to operate, but in the ~4 mos. of the shoulder seasons, it often doesn’t make sense to fire up the wood stove (when it’s only cold in the mornings). This is where the heat pumps shine. This winter we will only use the oil heat when the temperature is below 25°F as per this [1] Mass Save site. A bonus of the heat pumps is the AC in the summer, which we now need about 2 mos. of the year.
So we are effectively deprecating our oil boiler. In the next year or so, we may pull out the indirect water heater (which is powered by the boiler) and replace with a heat pump water heater. Then in ~5-10 years when our oil boiler is at EOL, we will likely replace with wood pellets.
[1] https://www.masssave.com/learn/blog/residential/5-tips-to-ma...
It’s mostly hydro electric here, so much so that it’s not called your ‘electric bill’, it’s the ‘hydro bill’.