As R is only working part time, we felt we needed to make economies, especially on our electricity consumption. We aren't fussed on heating our bedrooms, so we closed the bedroom doors, left the bathrooms/toilet exhaust fan off, which drags in fresh air (cold in the winter, hot in the summer), unless we were using them and set the thermostat to 18 during the day, chill off the place, and 19 at night, a bit warmer. We did this for well over a month and eventually we agreed we were both miserable with that way of living.
Once we had both mentioned to each other that we were unhappy, we flung open the doors, put the exhaust fan on and odd as it may seem turned the heating down to 17 and started to discuss revere mortgages and that the kiddies are all doing ok by their own account and all they will inherit is this place mortgaged to the max. As a concession to economies, we kept the spare room door closed and so not heated, but that is where the washing dries on the rack and it was taking forever to dry, but I could manage ok with a four day drying period.
There may well be a time in the future when we really have to get really serious about our energy consumption and close off rooms, but not yet.