Duct & Envelope Tightness Testing (DET)

Advanced Service Company LLC has been certified by Southface Energy Institute as a Duct & Envelope Tightness tester. DET testing helps isolate duct leakage and structure infiltration problems.

Duct and envelope tightness testing is an important part of improving HVAC system efficiency and overall building performance. Over time, air ducts can develop leaks and gaps that allow conditioned air to escape before it reaches the intended rooms. Similarly, the building envelope—made up of walls, ceilings, windows, doors, and other structural components—can develop air leaks that allow outside air to enter and conditioned air to escape. These issues force HVAC systems to work harder to maintain comfortable indoor temperatures, which can increase energy costs and reduce system efficiency.

Duct tightness testing measures how much air is leaking from a building’s duct system. Technicians use specialized equipment, such as duct testers and pressure gauges, to pressurize the duct system and identify areas where air is escaping. This process helps locate leaks, disconnected ducts, or poorly sealed joints. Once these issues are identified, sealing and repairing the ductwork can improve airflow, increase comfort in different areas of the building, and help the HVAC system operate more efficiently.

Envelope tightness testing focuses on the overall air leakage of a building. One of the most common methods used is a blower door test, which temporarily installs a powerful fan in an exterior doorway to measure how much air leaks through the building envelope. The test helps identify problem areas such as poorly sealed windows, gaps around doors, attic leaks, and other openings that allow unwanted air infiltration. Improving envelope tightness can help stabilize indoor temperatures, reduce energy waste, and improve indoor air quality.

Advanced Service Company LLC can help both homeowners and businesses by providing professional duct and envelope tightness testing services. Their trained technicians use specialized diagnostic equipment to accurately measure air leakage and identify problem areas that may be affecting comfort and efficiency. After testing, they can recommend and perform improvements such as duct sealing, insulation upgrades, or air sealing solutions. By addressing these issues, Advanced Service Company LLC helps customers improve HVAC performance, lower energy bills, and create more comfortable indoor environments. 

Blower door testing is a diagnostic method used in HVAC and building performance to measure how airtight a home or commercial building is. During the test, a powerful fan is temporarily mounted in an exterior doorway and used to either pressurize or depressurize the building. This process allows technicians to measure how much outside air is leaking into the structure through gaps, cracks, and other openings. By identifying these air leaks, blower door testing helps determine how efficiently a building retains conditioned air produced by the HVAC system.

Air leakage can significantly affect the performance of heating and cooling systems. When a building is not properly sealed, conditioned air escapes while unconditioned outdoor air enters. This forces HVAC systems to run longer and work harder to maintain comfortable indoor temperatures, increasing energy usage and utility costs. Blower door testing helps identify problem areas such as poorly sealed windows and doors, attic penetrations, duct leaks, and gaps in insulation so they can be properly sealed and improved.

Blower door testing also plays an important role in energy efficiency programs, building codes, and indoor air quality improvements. Many new construction projects and energy efficiency upgrades require blower door testing to verify that buildings meet certain airtightness standards. By reducing uncontrolled air leakage, buildings can maintain more consistent temperatures, reduce moisture problems, and improve overall comfort for occupants.

Advanced Service Company LLC can assist both homeowners and businesses by performing professional blower door testing and identifying areas where energy is being lost. Their trained technicians use specialized equipment to measure air leakage accurately and pinpoint problem areas within the building envelope. After the test, they can recommend solutions such as air sealing, insulation improvements, and HVAC adjustments to improve efficiency. With the help of Advanced Service Company LLC, customers can reduce energy costs, improve indoor comfort, and ensure their buildings operate as efficiently as possible.