Buy one of those cheap draft stoppers that slip under your door or roll up a towel and put it at the base of the door. Another alternative is to install weather stripping on the door.
Wearing thick clothes, such as jackets and hats. But hats also help problem achne. But we will never lose a lot of heat unless if we are just in our underwear in antartica. :Syour mom also helped me...
Heat production can be reduced and it cannot be prevented. Reduce current density by increasing conductor cross section or increase core area to reduce copper content. In both cases there are limits....
You should do all these things.
Have loft insulation fitted Have cavity wall insulation fitted Draught excluder placed by your doors Carpet your house all the way round Have double glazing...