Thermosiphoning

Many believe that since they have heavy curtains covering their windows they don't need further insulation.

However, most heating elements such as forced air registers or baseboard units are located directly below the windows.  When standard draperies are in use this creates two effects which contribute to heat loss through the glazing.

1) While a room is being heated, loose-fitting draperies concentrate heat flow against the glass. The amount of heat loss depends upon the location of the heat source relative to the glass and the length of the draperies.

2) When the heating element shuts off, a "chimney effect" begins. Air between the window and the drapery cools and falls to the floor, drawing more warm air from the ceiling down between the window and drapery. This air also cools and falls to the floor, and the process continues.

Energy losses take place through windows in four ways:

• Conduction
• Convection
• Radiation
• Infiltration

If any one of these are not addressed expensive and unnecessary losses will continue.

HeatSaver either completely eliminates or seriously reduces the effects of each of these important factors.