If there's a hazy film, condensation, or visible moisture trapped between two panes of glass that never fully clears, even on dry days, that's not dirt on the glass. It's a sealed unit that has failed, and cleaning won't fix it.
Why It Happens
Modern sliding glass doors typically use an insulated glass unit (IGU): two panes of glass with a sealed air or gas gap between them for insulation. Over years of expansion and contraction from heat and humidity, the edge seal around that gap can fail, letting in moist air. Once that happens, condensation forms inside the sealed gap where it can't be wiped away.
Why It's Worse in Florida
Constant heat and humidity cycling puts more stress on IGU seals than a drier, more stable climate would. This is one of the more common glass-related calls we get, especially on older doors or ones exposed to direct sun most of the day.
What It Costs to Fix
The good news: this is almost always a glass-unit replacement, not a full door replacement. The existing frame, rollers, and track are unaffected, only the sealed glass unit itself needs to be swapped, which is typically a fraction of full door replacement cost. Exact pricing depends on the panel size and glass type (standard, tempered, impact-rated, or tinted).
Can You Just Live With It?
Cosmetically, yes, some homeowners do for a while. Functionally, a failed seal often means reduced insulation value too, you may notice the door feels less effective at blocking heat or cold near it. It won't get better on its own, and it typically doesn't get meaningfully worse either, so there's no urgency beyond your own preference.
Getting an Exact Price
A photo of the fogged area and the panel dimensions is usually enough for a preliminary estimate; the exact price is confirmed once the glass type and thickness are verified.
Fogged glass doesn't mean a new door
In most cases we replace just the glass unit, not the whole frame. Get a free quote to confirm your exact cost.