I have a 2 bedroom trailer and we use propane for heating and cooking. I want to say we spend about $1100 during the winter on propane. Summer is pretty low/non existent since its only for cooking and we normally have enough left over from winter to last the summer, may end up needing a fill in September/October. Just checked and each delivery is about 130 gallons and we get deliveries every 1.5 months. After some repairs each delivery is lasting a little longer but homes are alot different than trailers.

It's hard to put a correct number because theres alot of variants like super cold streaks, extra warm streaks, how well insulated your place is(mine had ALOT of water damage when bought), etc.