11. Does your household have good window insulation?
Up to 40% of heating can be lost through windows, so good window insulation greatly reduces the amount of heating you need. Heavy floor-length curtains or blinds with some sort of pelmets reduce heat loss on cold nights because they prevent the layer of cold air next to the glass from circulating to the rest of the room.
Double-glazing reduces heat loss (and gain) through windows. This is normally very expensive, but there are also cheaper DIY methods of installing an extra layer of glass. Or, you can use Clear Comfort film to create a sealed air space between the glass and the room. For inconspicuous windows, you can even stick on bubble-wrap. This insulates the glass well without blocking much light. If you are building or renovating, the Windows Energy Rating Scheme (WERS) website has detailed information on types of insulating glass and window frames that provide much better insulation than standard windows