If you call the utilities with the address and ask for the average annual usage, they will usually give it to you. Then you have to adjust for number of people, ages, personal temp preferences, etc.
Condo association docs can be reviewed - usually a real estate pro will provide these. You can also request info as part of an offer - Subject to review of docs including but not limited to annual fee history - or something like that.
A good pro with experience will help you.
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