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What Causes Discoloration in Double-Pane Windows?

Double-pane windows, also known as insulated windows, help you save on your energy costs by limiting the amount of heat that can pass through into your home. Sometimes, though, you might notice discoloration on your windows. Here’s what causes this discoloration and what can be done to fix it.

What Causes Discoloration in Double-Pane Windows?

How Double-Pane Windows Work

Every home has an energy enclosure, which is comprised of the attic, exterior walls and fenestrations (entry doors, skylights and windows). These components are insulated in one way or another. The walls may have batt or expanding foam insulation, and the attic may have loose-laid or blown-in insulation while entry doors may have foam cores. A well-insulated energy envelope should maintain consistent indoor temperatures, which should make the indoor space more comfortable and energy-efficient.

Windows (and patio doors) are mostly made of glass, a naturally conductive material. The aforementioned types of insulation are not suitable because they’re opaque. The solution is double-pane windows. Inserting a space between interior and exterior glass surfaces minimizes heat conduction through the glass. When set into an insulated sash or frame, double-pane windows complement the rest of the energy envelope in providing comfortable indoor spaces. This has proven to be so effective that all Renewal by Andersen® replacement windows feature double-pane glass as a standard component.

Double-Pane Window Discoloration

Indoor moisture problems can cause discoloration on double-pane windows. It may appear as black or similarly dark-colored streaks on the window surface, but the cause is the same. Fortunately, window discoloration is preventable. You simply need to control your home’s relative indoor humidity. Most residential HVAC systems already have humidifier/dehumidifier systems built in, which means you only need to consult your HVAC technician on how to adjust its settings.

Repair or Replace?

How about windows that are already discolored? The first thing you should check is your window warranty coverage, especially if the window is still relatively new. You can also ask your window contractor if repairs are possible as some double-pane glass assemblies are designed as a single unit. If the windows will ultimately require replacement, ask your replacement window provider if an insert window replacement is possible. Instead of replacing everything, insert window replacements retain the original frame, which may cost less and take less time to install.

Renewal by Andersen of St. Louis is your leading provider of replacement windows. Give us a call at (314) 332-2364, or fill out our contact form. We serve customers in Chesterfield, MO and nearby areas.

Reviews

"Scheduled for December, Installed in October, High quality windows and Excellent install team. I haven't seen people work together like that in years. I am definitely impressed."

Raymond Mills
Oct 13, 2022

"The service provided by Renewal by Anderson is great, both on the sales and the installation side. Our sales representative was very accommodating and helpful. The installation crew was efficient and they all were professional. These are really nice windows and a great upgrade especially from builder-grade windows."

Brad Allen
Nov 17, 2022

"It is great to do business with a company that still cares about what they do and respects the end goals. We appreciate your craftsmanship professionalism, and cannot say enough about the wonderful experience. It was clear from the onset of the installation we got the A Team and we certainly appreciate that."

1speedwagon
Nov 17, 2022

"Everyone I worked with from setting up the initial appointment to the salesman to the installers to everyone who checked on us and kept us updated on the progress of the windows was courteous, professional, and responsive. There’s always someone who is willing to answer your question without jumping through hoops which is rare these days! The installers were on time, did a beautiful job, cleaned up the space better than I expected, and even helped me with some blinds I couldn’t remove and fixed my squeaky front door! I’ve already recommended Renewal by Anderson to friends!"

Karen Mortillaro
Nov 19, 2022

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