Duct Repair & Sealing

Technicians locate hidden duct leaks using a specialized duct pressurization diagnostic test known as a duct blaster, often paired with thermal imaging cameras or non-toxic theatrical fog. During this evaluation, the technician temporarily seals all supply and return grilles, pressurizes the duct network with a calibrated fan, and measures airflow leakage through cracks and gaps. TrueTemp HVAC Solutions performs thorough duct testing in Novato homes to pinpoint exact failure points located inside inaccessible attic and crawlspace cavities. This scientific approach ensures every major gap and disconnected collar is targeted directly.

Standard cloth-backed duct tape has a rubber adhesive that dries out, turns brittle, and fails completely within one to two years under attic heat fluctuations. In contrast, duct mastic is a thick, water-based acrylic elastomer paste applied with reinforced fiberglass mesh that cures into a permanent, flexible, and airtight gasket. TrueTemp HVAC Solutions exclusively uses UL 181-approved mastic sealants and foil-faced tapes on all Novato duct repair jobs. These specialized materials expand and contract with seasonal temperature changes without degrading or leaking.

When conditioned air leaks into an unconditioned attic or crawlspace, your air conditioner or heat pump must run longer cycles to reach the temperature set on the thermostat. By sealing joints, seam connections, and tears, 100 percent of the air your system heats or cools is delivered directly into your living spaces. TrueTemp HVAC Solutions helps Novato homeowners eliminate this continuous loss of energy, directly reducing monthly heating and cooling runtimes. Shorter runtimes mean less electricity and gas consumption while prolonging the operating lifespan of your HVAC equipment.

Yes, leaky return air ducts operate under negative pressure, which acts like a giant vacuum pulling in whatever air surrounds the leak in your attic or crawlspace. If return trunks have splits or disconnected fittings, they pull in fiberglass insulation fibers, mold spores, rodent droppings, and humid crawlspace air, blowing them directly into your bedrooms and living spaces. TrueTemp HVAC Solutions seals and repairs damaged return plenums and ducts throughout Novato to eliminate this hazardous cross-contamination. Sealing your return network ensures that only filtered, healthy indoor air enters your HVAC system.