If you have a fireplace, Guantee that you shut the damper. An open damper is like leaving a window open up. If you do not utilize the fireplace, then include and seal the entrance with the fireplace with a few solid material, such as plywood. Examine your insulation. That is http://hvac-repair-west-hills83184.blog2learn.com/26208209/9-ted-talks-that-anyone-working-in-insulation-companies-in-la-should-watch