Albany – September 07, 2026 -- Homeowners who install new insulation but still feel cold drafts may be missing a critical second step: air sealing. According to insights shared in a HelloNation feature, insulation slows heat transfer through walls, floors, and ceilings, but it does not stop air from moving through cracks and gaps.
Small gaps let conditioned air escape even in fully insulated homes
Common trouble spots include window frames, door thresholds, attic hatches, and areas where pipes or wiring pass through exterior walls, says Darren Haggett, Branch Manager and Insulation Expert at Builders Installed Products of New York LLC in Albany, New York. Rooms above garages, additions, and spaces near exterior corners are especially prone to temperature swings because they contain more seams and transitions where air can move freely.
Older homes typically leak more air than newer construction
Settling, aging materials, and outdated building techniques all contribute to gaps that were never properly sealed in older properties. Adding more insulation without fixing these underlying leaks can produce far less improvement than homeowners expect.
A blower door test or visual inspection can pinpoint hidden leaks
The recommended approach starts with identifying exactly where air is escaping, using either a visual inspection or a blower door test. Once leaks are located, sealing them with the right materials creates a more consistent barrier for insulation to support -- with attics, basements, and crawl spaces often offering the biggest, most accessible gaps to address first.
Windows and doors matter less than most homeowners assume
Weatherstripping and caulking around windows and doors help, but they rarely account for most of the air loss in a typical home. A house functions as a connected system rather than separate rooms -- air leaking into an attic can pull conditioned air away from rooms below, forcing heating and cooling systems to work harder.
Persistent drafts and mismatched thermostat readings signal a leak
Cold spots on interior walls, drafts near baseboards, and rooms that never quite match the thermostat setting are common warning signs, alongside unexpectedly high utility bills. Professional assessments using thermal imaging or a blower door test can reveal leaks invisible during a normal walkthrough, helping homeowners set realistic expectations before starting a project.