[DharmaPolice]

It's going to vary entirely depending on your dwelling type. But that's a red herring I think. We need to make homes energy efficient anyway (regardless where people work) and once you've insulated/moved to more efficient heating/cooling then the cost of keeping your dwelling running for the hours you're personally out should be pretty low. Not to mention however many households have to be kept warm/cool because there are other household members home.