
From the moment heat is generated, it tries to escape into the colder air outside. It vanishes through the ceiling walls, sneaks out around windows and doors. The rate of escape depends on the difference between the inside and outside temperatures, and on the resistance it meets. Insulation is the key barrier that traps and holds heat inside.
A thorough re-insulation job can cut your annual heating bill by as much as 50 per cent. A more modest improvement to your insulation can save you 20 to 30 per cent annually. So if your bill is now $300, a 30 per cent saving could reduce it to $210. The cost of insulating all or part of a house is usually paid for in 5 years or less, through lower annual heating costs.
A quick way to find out if your house needs extra insulation is to take a look outside. On a dull day, is the snow melting on the roof? If so, you don't have enough insulation in the attic. Is snow disappearing from around the sides of the house? If so you need insulation on the basement-walls.