Drafty windows: the cheap fixes to try first and how to time a replacement

Stand next to a closed window in a Rolling Meadows or Des Plaines home on a January night and you may feel a distinct river of cold air. The instinct is to price replacement windows, and sometimes that is right. But the draft often is not the window unit failing; it is air moving through gaps around it, or cold glass cooling the air beside it, which are three different problems with three very different price tags. Sorting out which one you have is worth an hour before it is worth a quote.

Start with diagnosis. On a windy day, move a lit incense stick or a thin strip of tissue slowly around the frame, the sash meeting rails, and the trim. Where the smoke flutters or the tissue dances, air is moving. Check the obvious mechanical causes first: a sash that does not fully close because of a failed lock or a warped latch leaks more air than any glass problem. Then check outside, where the trim meets the siding; the caulk line there has a lifespan, and cracked exterior caulk is the single most common draft source in the suburbs and the cheapest to fix.

The fix order runs cheap to expensive. Weatherstripping on the sash, renewed where it has flattened, typically costs a few dollars per window and an afternoon for the house. Fresh exterior caulk around every frame, with the old failed bead cut out first, is a one-weekend job. Interior window insulation film, the shrink-wrap kits, looks humble and works genuinely well on the worst windows for about $5 to $10 a window per season. Storm windows, which many older suburban homes were built with, deliver a large share of a replacement window's comfort benefit when they are intact and closed; a missing or broken storm window is worth repairing before anything else is quoted.

Real replacement triggers are narrower than the sales pitch. A failed seal between panes shows as fog or moisture inside the glass that no cleaning touches. Rot in a wood sash or frame that a probe pushes into is structural, not cosmetic. A window that cannot open, close, or lock is a safety and egress issue, not an efficiency one. And single-pane windows with no storms, in a home you plan to keep for a decade, are a legitimate efficiency project. Expect typical installed pricing of $600 to $1,200 per window for quality double-pane vinyl or fiberglass units in standard sizes, with large, shaped, or wood windows above that range, and be skeptical of any quote, high or low, that does not itemize by window.

Timing helps the budget. Window companies in the northwest suburbs run their lightest schedules in late winter, and the honest ones will say so; the same project quoted in September, when every homeowner feels the first draft, carries the season's full calendar. Replacing in phases, worst elevations first, usually the north and west sides that take our winter wind, spreads the cost without wasting any of it.

If your tissue test shows the frames are tight and the glass is clear, your windows are probably fine and your money belongs in the attic insulation above them. The directory lists window and glass companies across the northwest suburbs for the windows that have genuinely failed; bring photos of fogged panes and soft wood, and any reputable installer will tell you quickly which units to replace and which to leave alone.