There used to be 82% and even 84% efficient furnaces, but
manufactures learned very quickly that cooling flu gasses
cases big problems....

Don't listen to who ever suggested replace it with 90%.....

Waste of money. So if you currently pay $350/month you would
save 35$ - 40$. That is stupid. Go with dual fuel HeatPump.

I am getting rapped by Vectren too. Switching off is the only answer.