Why you need a blower door test is because air leakage is one of the biggest sources of energy waste, discomfort, and moisture problems in homes, and you cannot accurately assess leakiness without measuring it. A blower door test quantifies how leaky your home is in CFM50 and air changes per hour, giving objective data rather than guessing. For new construction, you need it because building energy codes like International Energy Conservation Code require it for certificate of occupancy to ensure homes meet minimum airtightness standards. For existing homes, you need it to diagnose drafts, high energy bills, uneven temperatures, ice dams, and indoor air quality issues, as air leaks account for 30 to 40 percent of heating and cooling costs. It also helps locate exact leak locations using smoke pencil and infrared camera while fan is running, so you know where to air seal for best return on investment. After air sealing, you need retest to verify improvements. For health and safety, blower door test combined with combustion safety testing ensures your home is not backdrafting furnaces or water heaters that could cause carbon monoxide issues. Overall it provides roadmap for making home more comfortable, efficient, and healthy.
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