Energy Analysis

Todd-Wadena Electric Cooperative invested in special equipment designed to detect heat loss so that we can help members pinpoint areas of infiltration, where weatherstripping or caulking can pay dividends in lower heating and cooling costs. Our technician will conduct one or both tests and provide detailed reports to verify results.

Blower Door Test

A blower door is a powerful fan that mounts into the frame of an exterior door.Blower Door The fan pulls air out of the house, lowering the air pressure inside. The higher outside air pressure then flows in through all unsealed cracks and openings.

The technician may use a smoke pencil to detect air leaks. These tests determine the air infiltration rate of a building. Establishing proper building tightness is important to reduce energy consumption due to air leakage, to avoid moisture condensation problems and uncomfortable drafts and to make sure that the home’s air quality is not too contaminated by indoor air pollution.

Our technician uses a calibrated door, which has several gauges that measure the amount of air pulled out of the house by the fan. Uncalibrated blower doors only locate leaks in homes. They provide no method for determining the overall tightness of a building. The calibrated blower door’s data allows the auditor to quantify the amount of air leakage and the effectiveness of any air-sealing job.

Infrared Scanning

Thermography, or infrared scanning, detects thermal defects and air leakage in buildings. It measures surface temperatures by using infrared video and still cameras. Thermography exampleThese tools ‘see’ light 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 the auditor determine whether insulation is needed and where. They also serve as a quality control tool, to ensure that insulation has been installed correctly.

Interior scans are often preferred over exterior scans 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.

Thermographic scans may also be used with the blower door running since it exaggerates air leaking through defects in the building shell.


The fees include trip charge, scans and reports
A. Infrared Scan  $60
B.  Blower Door Test  $60
A. and B.  $90