Test House Project
Summary of Finding
Summer Heat Gain
The houses featured in this report are located side by side in Springfield, IL. On the day that the pictures were taken the observed high for the day was 91°F and both houses had their thermostats set at 70°F. The houses are within 100 square feet total size of each other.
All inside pictures will be marked with three temperatures; cavity, stud, and truss (when applicable).
Outside pictures are marked to show low, high, and average temperatures over a total surface area.
Inside Pictures: The walls of the Low-E protected house are 6°-8°F cooler than the non Low-E house. Over the period of a coolling season, this difference would result in less load being placed on the colling unit and significant energy savings for the home owner.
Control: The Norht facing walls represent the control in this study. These walls see little direct radiant heat and their temperatures are nearly the same.
Outside Pictures: The walls of the Low-E protected house show hight temperatures of 117°-119°F and average temperatures of 114°-115°F. The walls of the non Low-E house show high temperatures of 114°-118°F and average termperatures of 111°-114°F. These pictures re-enforce that Low-E Housewrap does not significantly raise temperatures behind vinyl siding.
With the thermostat set at 70°F, the average wall cavity temperature for the South and Southwest walls was 72.5°F, a difference of 2.5°F.
Non Low-E Front
The Non Low-E House is located immediately to the left of the Low-E House.
With the thermostat set at 70°F, the average wall cavity temperature for the South and Southwest walls was 78.8°F, a difference of 8.8°F
The temperature of the vinyl siding, between the house with the Low-E Housewrap and the house without, does not show a significant difference.
This study is meant to provide comparison data in an actual building system. It is not intended to be used in lieu of testing. The images shown demonstrate how Low-E Housewrap performs in reducing summer heat gain. These images are one part of a continuing study. Further information/images will be releases as they become available.