Why is there fog or condensation between my window panes?

Fog or condensation between panes usually means the seal on an insulated glass unit has failed, allowing moisture into the space between the glass. That is different from condensation on the room-side or exterior surface of the glass.

For homeowners and property managers, the right answer usually depends on where condensation appears, whether it is between panes, age of the unit, and whether visibility or energy performance is affected. A good FAQ post should make the decision feel clear without pretending every glass project is the same. In the Phoenix metro area, heat, sun exposure, dust, foot traffic, tenant needs, and security concerns can all change the best recommendation.

The safest next step is to have Arizona Glass & Door review photos, measurements, the property type, and any surrounding conditions before recommending a final scope. That keeps the visitor from guessing and helps route them to the right service: repair, replacement, resealing, window film, security film, custom glass fabrication, shower glass, mirror installation, board-up, or commercial door work.

Recommended next step: Send photos of the fogging, especially when it is visible between panes, and include the approximate size and location of the window.