Buying Guide

Signs Your Great Lakes Home Needs New Windows

In this climate, windows announce their failure in January: ice on the inside of the glass, curtains that move on still nights, and a furnace that never rests. Here is how to tell aging from actually failed.

1. Ice or frost on the inside of the glass

The signature Great Lakes window failure. When the interior surface of the glass drops below the dew point of your indoor air — easy to do on a single-digit night — moisture condenses on it, and when the surface drops below freezing, it becomes frost or a ridge of ice along the bottom rail. Occasional light fogging on the coldest morning of the year is forgivable. Ice you can scrape, water pooling on the sill by breakfast, or frost appearing at ordinary indoor humidity means the glass is running far too cold: single panes, failed seals, or conductive old frames. That moisture does not evaporate harmlessly — it soaks the sash and sill day after day, all winter.

2. Fog or haze between the panes

Double-pane windows are sealed units with insulating gas between the panes. Permanent fog, haze, or droplets inside the glass means the seal has failed and the argon fill is long gone. The window still keeps out snow, but its insulating value has dropped substantially — and in a heating-dominated climate you pay for that every day from November to April. One failed unit can be a glass-only repair; seal failures spreading across several windows of the same age usually mean the whole batch is at end of life.

3. Drafts you can feel across the room

On a windy January day, hold the back of your hand around the sash edges and where the two sashes meet. Lake-effect wind finds every gap in worn weatherstripping, warped sashes, and frames that have pulled away from the masonry. A draft strong enough to move a curtain or chill your ankles from across the room is not a weatherstripping problem — it is air moving through the assembly, and it is why one bedroom never warms up no matter what the thermostat says.

4. Rot, peeling paint, or soft sills

Freeze-thaw cycling is brutal on wood. Snow piles against sills, melts on a sunny afternoon, soaks in, and refreezes at night, prying the wood apart season after season. Press a screwdriver gently into sills and lower corners: soft, spongy wood means rot has started. Interior condensation adds to the damage from the other side. Isolated rot can be repaired with epoxy by a good carpenter, but rot that returns or spans multiple windows means water is getting in behind the frames — a replacement-level problem.

5. Windows painted, swollen, or frozen shut

Much of the region's housing stock — 1920s brick bungalows in Chicago, post-war capes around Detroit and Cleveland — carries original wood windows under many layers of paint. Sashes that no longer move are more than an annoyance: bedroom windows are emergency exits, and a window that will not open is a safety issue before it is a comfort issue. The same goes for double-hungs that slam shut on failed balances or will not close far enough to lock.

6. Basement windows that fail the egress test

If you are finishing a basement in an older Great Lakes home, the small hopper windows typical of pre-war and post-war foundations almost never meet modern egress requirements for a bedroom — codes generally demand an opening large enough for an adult to climb through, at a height they can reach. Converting to a code-compliant egress window is excavation and masonry work as much as window work, which is exactly why it belongs with a specialist rather than a general handyman.

Repair or replace?

A useful framework for this climate: repair when the problem is isolated — one foggy unit, one bad balance, one soft sill — and the window is otherwise sound. Replace when problems are spreading across windows of the same age, when frames themselves have failed, or when interior ice shows up every winter regardless of what you do to the humidity. And do not assume you must wait for spring: winter installations are routine here, done one opening at a time, and the off-season often means shorter lead times.

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