8 Signs You Need New Windows (and When You Don't)

Windows fail quietly — here's what to watch for

Unlike a roof leak, failing windows rarely cause a dramatic moment. They just slowly cost you money in wasted energy and comfort while you get used to the draft. Here's how to tell the difference between a window that needs replacing and one that just needs a tune-up.

The 8 signs

• You can feel a draft near the window even when it's closed — the seal or the sash is failing.
• Fog or condensation between the panes — the insulating gas has leaked out and the seal is broken. This can't be cleaned; the glass unit has failed.
• Windows stick, won't stay open, or are painted shut — worn balances or swollen frames.
• Rising heating and cooling bills with no other explanation — old windows bleed conditioned air.
• Visible rot, soft frames, or water stains around the window — especially on wood frames.
• Outside noise pours in — modern double-pane windows should noticeably quiet a room.
• Single-pane glass — if you still have it, you're heating and cooling the outdoors.
• Chipping, peeling, or condensation-driven mold on the frame or sill.

Repair or replace?

Not every problem means new windows. A broken balance, a torn weatherstrip, or worn hardware is a cheap repair on an otherwise sound window. But a failed seal (the foggy-glass problem) usually means replacing the glass unit or the window, and once several windows are failing at once — or they're 20+ years old and single- or early double-pane — replacing them as a project is more cost-effective than chasing one repair at a time.

If you're weighing the spend, the real question is payback: see are new windows worth it for the energy-savings and resale math, and what replacement costs per window and whole-house.

Pro tip from our network contractors

The fog-between-the-panes test is the single most reliable sign. If wiping both sides of the glass doesn't clear it, the sealed unit has failed — no amount of cleaning brings it back, and its insulating value is largely gone.