If you are living in a big, own house, you possibly are happy because of that, mostly in the time of summer time. And what about winter? How much funds you are wasting each year for heating? When your resident is older then ten years, it probably does not have a decent wall insulation. Or probably even you don't have a modern windows which will protect your house from loosing the hot air. If you wish to cut your costs, you have to spend some cash first.