Insulation & Energy Efficiency
To maintain comfort in your home, the heat lost in winter must be replaced by your heating system and the heat gained in summer must be removed by your air conditioner. Your walls are the biggest source of heat loss in your home (accounting for up to 35%). This is primarily due to 2 reasons: air leakage and heat loss (or gain).
In all homes, there are areas either between studs, at wall intrusions such as wiring and windows and improperly sealed building paper (the list goes on) which allow air to flow through it.
Heat flows naturally from a warmer to a cooler space. In winter, heat flow moves directly from heated living spaces to the outdoors; directly through walls – wherever there is a difference in temperature. During the hot season, heat flows from outdoors to the house interior. Traditional home insulation is only between the studs in your walls; spaces between the insulation and studs, and areas entirely lacking insulation may have a profound effect on the entire effectiveness of the between-the-stud insulation.
Insulating the exterior walls with EIFS decreases this heat flow by providing a countinuuous barrier to the flow of heat, via insulation and an air-flow resistant barrier.
In this thermal imaging picture; dark purple represents a cool area, and the temperature moves up through red, orange, yellow and white as it gets warmer. You can tell that it is a cool night by the colour of the ground, and likely early in the evening, as the concrete wall beside the driveway is still warm. You can see that the overhang on the house(purple) is properly insulated, as there is very little heat being lost through it. You can also see (on the wall next to it) where the insulation is between studs (red squares) and how much heat the studs are allowing to escape (orange). The first floor appears to contain only drywall, and no insulation.
Note: Calculation includes inflation.