We use Thermography, which measures surface temperatures by using infrared video and still camera. These tools see light that is in the heat spectrum. Images on the video or film record the temperature variations of the building’s skin, ranging from white for warm regions to black for cooler areas. The resulting images help us determine whether insulation is missing or there are areas of infiltration. We also offer inspections using our equipment to serve as a quality control tool, to ensure that insulation has been installed correctly. See photos of Images to see the heat loss and infiltration.
A thermographic inspection is done inside and outside the home. We us both to determine the best results under certain weather conditions. Interior scans are more common, because warm air escaping from a building does not always move through the walls in a straight line. Heat loss detected in one area of the outside wall might originate at some other location on the inside of the wall. Also, it is harder to detect temperature differences on the outside surface of the building during windy weather. Because of this difficulty, interior surveys are generally more accurate because they benefit from reduced air movement.
Thermographic scans are also commonly used with a blower door test running. The blower door helps exaggerate air leaking through defects in the building shell. Such air leaks appear as black streaks in the infrared camera’s viewfinder. Basically we attach a fan in your door way and pressurize your house. This extra pressure makes the energy losses more apparant.
Thermography uses specially designed infrared video or still cameras to make images (called thermograms) that show surface heat variations. We can alos use Thermograms of electrical systems to find hot electrical connections or components. Thermograms of mechanical systems can detect the heat created by excessive friction. We use thermography as a tool to help detect heat losses and air leakage in building envelopes.
We offer low cost options to have a scan done before purchasing a house; even new houses can have defects in their thermal envelopes. You may wish to include a clause in the contract requiring a thermographic scan of the house. A thermographic scan performed by a certified technician is usually accurate enough to use as documentation in court proceedings. We use the most accurate thermographic inspection device, a thermal imaging camera, which produces a 2-dimensional thermal picture of an area showing heat leakage. Spot radiometers and thermal line scanners do not provide the necessary detail for a complete home energy assessment. Infrared film used in a conventional camera is not sensitive enough to detect heat loss.
To prepare for an interior thermal scan, the homeowner should take steps to ensure an accurate result. This may include moving furniture away from exterior walls and removing drapes. The most accurate thermographic images usually occur when there is a large temperature difference (at least 20°F [14°C]) between inside and outside air temperatures. In northern states, thermographic scans are generally done in the winter. In southern states, however, scans are usually conducted during warm weather with the air conditioner on.
Some times of the year, because of a phenomenon known as “thermal loading,” it might be necessary for the homeowner–depending on local conditions–to create and maintain a specific inside/outside temperature difference for a period of up to four hours before the test will be performed. Running the air conditioner in cooling climates or the central heat in heating climates can do this. Ask the auditor prior to the test if this will be necessary.