I am looking at renovating a long farm building into three accomodations. We will insulate the roof (at least 20cm), walls (probably 5cm) and install double glazing. Eventually, all three of them will be rented out. The property is in Brittany, so the winters are pretty mild. What kind of heating should I use? I could go with electric heaters (no maintenance, easy installation, but expensive to run) or oil fired central heating (cheaper to run, maybe a bit more expensive to install, but adds value to the property). We will be installing everything ourselves, so the difference in cost is not all that great. Where I'm from, nobody in their right mind uses electricity for heating, but I read that 70% of houses in France do. How expensive is electric heating? What do you pay per month in winter on electricity? What if tenants run the electric heaters on max for the whole week? I understand that there is no definitive answer to these questions, but some of you may be able to share your heating costs to give me (and others) an idea... Thanks!