There are virtually hundreds of spots through which energy can leak and money is lost.
This booklet is primarily for manufactured home owners, although many of the energy saving suggestions will be useful for renters as well. The major part of the booklet deals with energy conservation, followed by a few solar options and remodeling and building addition ideas—things you might consider once you have taken all the fundamental energy conservation steps.
Find here authoritative advice about: Caulking, weatherstripping, insulation, windows, shades, doors, celing insulation, etc.
Download this booklet published by the Missouri Department of Natural Resources.