Window film will help increase the efficiency of your existing windows by up to 25%. It is estimated that in an uninsulated home, around 35% of heat loss occurs through walls and 25% is lost through your roof. The remaining 40% is lost through doors, windows and your floor.
When window film is properly applied, it decreases energy transfer coming in from the outside. It will both reflect and absorb some of the radiant energy from the sun. Depending on the darkness and the amount of reflectivity you have on your chosen window film, a percentage of the remaining radiant energy will transfer through a window with window film installed.
In a sense, window film is an insulator much like the insulation you have in the walls or attic of your home. In addition to protecting your home from outside energy, window film will also help retain any energy generated by your heating and air conditioning systems. In the summer, window film will block outside heat and any cool air generated by your air conditioner will stay in your property longer versus escaping from your windows.
There is a common misconception that you want radiant heat to enter your home through the windows in the winter months to heat your home. While that may be true to a certain extent, allowing radiant heat to enter the home through the windows in the winter months puts increased wear and tear on your home’s heating system. Once the sun sets, temperatures drop forcing your heating system to work overtime to maintain the level of heat you were experiencing throughout the day, thus increasing your heating bill.