It is important to use less energy because it saves us money and it is good for the environment.    We use different types of insulation to reduce the heat energy lost from a house,        these include:     Double glazing     Loft insulation     Cavity wall insulation     Draught-proofing     Hot water tank jacket     Curtains Heat loss from a house     The most effective type of insulation is the one that saves most money each year.     The most cost effective type of insulation is the one that pays for itself the fastest.