Less driving ( and adjusting yearly mileage on insurance to reflect that), being able to eat at home. Less side trips or stops on the drive home since you're not driving to work often. Less "hey let's go get lunch" or "stop somewhere for a beer after work," etc.

No midday trips to the coffee machine or snack machine...

We have a nice sunlit office in winter which negates the need for as much heat. And in the summer, trees shade it to help with cooling...

But ultimately it comes down to self discipline. ...