Find the type of problem
A cold feeling near a window can come from air moving through gaps, from the cold glass surface, or from dampness and condensation. Check whether the frame seals close properly and whether drafts appear on windy days.
Use materials in the right place
Weatherstripping is generally suited to moving joints such as opening windows and doors; caulk can seal small stationary gaps where appropriate. Follow manufacturer instructions and ensure the material suits the surface and expected movement.
Never block required ventilation
Vents serving gas appliances, fireplaces and other fuel-burning equipment must not be sealed just to stop a draft. Changes can increase carbon-monoxide risk. If a heating appliance is involved, ask a qualified contractor to assess ventilation and flues.
Review moisture before insulating
If glass and wall surfaces collect condensation or show mold, find the source of moisture and address ventilation first. Simple seals can improve comfort, but they do not repair structural gaps, damaged frames or water leaks.
A general educational overview, not a substitute for professional guidance. Check current local rules and trusted primary sources before making consequential decisions.
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