If your home isn't fully insulated, consider upgrading it. Loft insulation can be replaced or replaced with thicker material.
Turn down your room thermostat or boiler a couple of degrees and wear more clothes.
Use localized heating such as radiant,convector or fan heaters while doing sedentary work such as working at a computer rather than heating the room continuously.
If rooms are heated by storage heaters, turn down the heat setting in rooms which aren't being occupied. Only background heat is necessary to prevent the room becoming damp.
Replace incandescent bulbs with CFLs.
Try to dry washing outdoors when the air humidity is low and there is a breeze rather than using the tumble drier.
I live in Ireland which has a damp climate but even with temperatures around 10C or 50F, clothes will at least half dry in the winter when it is breezy and there is a little sunshine.
There are more tips on energy saving in my hubs here: