High heating bills for steam heat building using natural gas

[Carey Ransone]

Hello everyone!

I have been living in an older home (100+ years) for about 2 years. The house is on radiator heat. We bought a new steam boiler during the winter of 2021. I've been told that boilers are an efficient heating source, but we've generally seen extremely high heating bills i.e. $300+/month during the winter season. The gas company has come out and said that the meter is fine, but I feel like there's something that's causing the higher bills. I was wondering 1/ if anyone has dealt with a similar problem and could tell me how they went about fixing 2/ I'm assuming a natural gas plumber would be the best person to call to get an assessment, but was wondering if anyone had any thoughts around the best professional to use in this situation. Any and all suggestions are welcome. Thanks!