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Energy Audit

Graphic of Blower Door test as an energy audit toolEnergy efficiency is crucial to every business and home. Clarke Electric Cooperative has expert technicians who will perform free energy audits and give you up-to-date energy advice tailored for your individual needs. Or, for a fee you can have our experts perform a blower door test to determine your home's air tightness and help you stop wasting money. Call Jason Gibbs at (641) 342-2173 or (800) 362-2154 to learn about conserving energy or to set up an appointment for an energy audit.


What is a Blower Door Test?
Professional energy auditors will use a blower door test to help determine a home's air tightness.  Following the test, you will then be able to figure where to concentrate your efforts to make your home more energy efficient. Closing up the cracks and gaps can reduce energy consumption due to air leakage, stop moisture condensation problems, stop uncomfortable drafts caused by cold or hot air leaking in from the outdoors, and make sure the home's air quality isn't too contaminated by indoor air pollution.


How Does a Blower Door Work?
A blower door is a powerful fan that mounts into the frame of an exterior 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 auditors may use a smoke pencil to detect air leaks. These tests determine the air infiltration rate of a building.

Blower doors consist of a frame and flexible panel that fit in a doorway, a variable-speed fan, a pressure gauge to measure the pressure differences inside and outside the home, and an airflow manometer and hoses for measuring airflow.

There are two types of blower doors: calibrated and uncalibrated. It is important that auditors use a calibrated door, which has several gauges that measure the amount of air pulled out of the house by the fan. Uncalibrated blower doors can only locate leaks in homes and 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.

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