2000 sq foot log cabin with insulated roof. Oil and propane. Primarily use propane, about $250/mo average across a Rinnai wall heater (basement, used sparingly) and a faux wood stove (main floor). Keep it between 70-75 when this is running.

Oil forced hot air furnace backup. 275 gal tank, fill it once a season. So an extra ~$60/month across 12 months since I filled it at >$5/gal most recently.

Furnace is set at 60 most of the time, use it to warm the house to 70 in the morning and then propane rest of the day unless it's a super cold day.

Have good southern exposure, this can keep us from using the stove on a sunny day even in winter.