Most double pane windows in North Texas hold up for 15 to 20 years before a seal fails, the glass fogs, or the frame degrades enough to justify replacement. That is noticeably shorter than the 20-to-25-year figure printed on a lot of window brochures, and the difference is not a manufacturing defect — it is this region. Hail, extreme heat swings, high wind, and shifting clay soil all put more stress on a window here than they would in most parts of the country, so the same product simply wears out faster in Dallas-Fort Worth than it would in a milder climate.
A double pane window, sometimes called an insulated glass unit or IGU, is two panes of glass separated by a spacer bar and sealed around the edge, with either air or an inert gas like argon trapped in the gap for insulation. That seal is the weak point. It is made of a flexible sealant that has to expand and contract with the glass every time the temperature swings, and every cycle it goes through uses up a little bit of its lifespan. Once the seal cracks, moist outside air works its way into the gap, the gas fill leaks out, and you start seeing the fogging or cloudy haze between the panes that homeowners usually associate with an "old" window. At that point the insulating value of the unit has already dropped, even if the glass itself still looks fine from a few feet away.
The frame matters just as much as the glass. Vinyl frames soften and can warp under sustained heat, aluminum frames conduct heat and cold directly into the house and expand at a different rate than the glass they hold, and wood frames are vulnerable to moisture intrusion once paint or cladding fails. Whichever material a home has, the frame and the seal are aging on two different clocks, and either one failing first is enough to end the window's useful life.
North Texas sits in one of the most active hail corridors in the country, and Dallas-Fort Worth in particular sees hail events large enough to crack glass, dent frames, and punch through screens on a fairly regular basis. A single hailstorm can take a window from "fine" to "needs replacing" in about thirty seconds, regardless of how old it was. Straight-line winds and the occasional derecho that come through with those same storm systems add a second layer of stress, flexing the glass and racking the frame with sudden pressure changes that a coastal or northern climate window was never really engineered around.
Then there is the heat. DFW regularly logs weeks of triple-digit afternoons every summer, and a west- or south-facing window can see surface temperatures well above the surrounding air temperature during peak sun. That heat load, combined with cold snaps in winter, means North Texas windows go through wider and more frequent thermal cycles than windows in a more temperate climate, which accelerates seal fatigue and can shorten the practical lifespan of an IGU by several years compared to the same product installed somewhere milder.
Foundation movement is the piece homeowners least expect to connect to their windows, but it matters here more than almost anywhere else. The clay-heavy soils common across Dallas, Fort Worth, Plano, Frisco, McKinney, and much of the surrounding area expand when wet and shrink when dry, and that constant movement shifts foundations enough to rack window and door openings out of square over time. A window that is slightly out of plumb puts uneven pressure on its seal and can start binding, letting air leak in around the sash even if the glass itself is undamaged. Finally, Texas windstorm and hail insurance is its own consideration: many policies here carry separate wind/hail deductibles, and insurers increasingly ask about impact-rated glazing when writing or renewing coverage, which is worth knowing before storm season rather than after a claim.
Start with a simple annual check rather than waiting for a problem to announce itself. Look at each window for fogging, condensation, or a hazy ring between the panes, run a hand along the frame for soft spots or warping, and check that the sash still opens, closes, and locks without forcing it. Any of those signs mean the seal or frame is already compromised, even if the glass looks intact.
After any significant hail or wind event, walk the exterior and look for pitting on frames and screens, cracked or starred glass, and gaps where caulking has pulled away — storm damage to windows is not always obvious from inside the house. If your neighborhood took a hail hit, it is worth having windows inspected even if nothing looks wrong, since small impact cracks in glass can spread later with normal thermal cycling.
For homes on the west or south side of a lot, or anywhere getting long, direct summer sun, low-E coated glass and a well-sealed frame make a real difference in both comfort and how long the seal lasts. In hail-prone parts of North Texas, impact-rated or laminated glass costs more up front but holds up to hail sizes that would crack standard glass, and it can factor into insurance pricing. If foundation movement has visibly affected door or window operation elsewhere in the house, get that addressed structurally before replacing windows in the same area, since a new window installed into a still-shifting opening will develop the same problems again. Alpine Exteriors inspects window seals, frames, and surrounding trim as part of a full exterior check, which is often the easiest way to catch a failing window before it turns into a bigger repair.
Re-caulking around frames and keeping weep holes clear of debris are low-cost maintenance steps that extend a window's life without any major work. When a window is genuinely due for replacement, matching the new unit's glass package and impact rating to what actually happens on that side of the house — sun exposure, hail exposure, wind exposure — matters more than chasing the highest efficiency rating on paper.
It depends on what the hail actually damaged. If the glass itself is cracked, chipped, or starred, the insulated glass unit typically needs to be replaced, though in many cases just the glass pane can be swapped inside the existing frame rather than replacing the whole window. If the frame, screen, or exterior trim took the damage but the glass and seal are intact, a repair is often enough. A physical inspection is the only reliable way to tell, since hail damage is not always visible from a distance.
The clearest sign is fogging, haze, or visible condensation trapped between the two panes of glass that does not wipe away because it is on the inside of the sealed unit. You may also notice the window feels drafty or the room around it is harder to keep comfortable than it used to be, which points to the gas fill having leaked out even before fogging becomes visible.
Many Texas homeowners policies do cover wind and hail damage to windows, but coverage details vary a lot by carrier, and a lot of policies here carry a separate, higher deductible specifically for windstorm and hail claims. It is worth reviewing your policy's wind/hail deductible before storm season rather than finding out the terms after filing a claim, and keeping photo documentation of your windows' condition can help if you ever need to file one.
For homes in hail-prone parts of Dallas-Fort Worth, it is a reasonable investment to weigh, especially on street-facing or west-facing windows that take the brunt of storms. Impact-rated glass costs more than standard double pane glass, but it holds up to hail sizes that would crack a standard unit, can reduce how often you're dealing with storm damage, and in some cases affects insurance pricing. It is not a strict requirement for every window on a house, but it is worth a real cost comparison rather than dismissing it outright.
If your windows are showing fogging, drafts, or storm damage, or you're just not sure how much life they have left, Alpine Exteriors can walk the exterior of your home in Dallas, Fort Worth, Plano, Frisco, Arlington, Irving, McKinney, or Denton and tell you plainly what's worth repairing and what's worth replacing. There's no obligation to act on the inspection — it's just information you can use to plan around the next hailstorm or the next hundred-degree summer, whichever comes first.