Insulation If you're looking to save heat and energy, then insulation could be the route for you. Given that heat rises, insulating your loft is the first step. It can pay for itself within just a couple of years, thanks to the energy you'll save. Another smart move is to fill cavity walls with insulation, as homes without it are losing almost as much heat as those without insulated lofts. Image Source: Pexels / Pixabay