Older Glass Systems Need Different Attention

Potomac Glass Repair services single-pane and double-pane glass systems throughout Rockville, Maryland and the DMV area.

Your home may have single-pane windows in older sections and double-pane units in additions or updated rooms. In Rockville, Silver Spring, and surrounding areas, where many properties were built decades ago and have been renovated over time, it is common to find a mix of glass types across the same house. Single-pane glass lacks the insulation of double-pane units, and double-pane glass can develop seal issues that single-pane windows never experience.


Potomac Glass Repair works with both systems and provides repair or replacement based on the condition of each pane and what you need the window to do. Single-pane glass is easier to replace but offers less thermal resistance, while double-pane glass provides better insulation but requires more care during installation to prevent future seal failure. The service helps you choose glass that fits your home and climate without pushing unnecessary upgrades.


If you are dealing with broken or underperforming glass in your DMV area home, call (202) 740-6600 for a consultation.

What Changes When You Replace the Glass?

When you schedule service in Rockville or throughout the DMV area, the technician measures your existing glass, checks the frame for damage, and discusses whether single-pane or double-pane replacement makes sense for that window. The choice depends on the age of the home, how the room is used, and whether you are planning other improvements in the near future.


After the glass is replaced, you will notice clearer visibility if the old pane was scratched or fogged, and you may feel a difference in how much outside noise or temperature comes through. Double-pane glass reduces heat transfer and can make rooms more comfortable during summer and winter, while single-pane glass is lighter and less expensive but offers minimal insulation.


The service does not include window frame replacement, sash repair, or modifications to the opening size. If the frame is rotted or the sash does not operate smoothly, those issues should be addressed before new glass is installed to avoid fit problems or shortened lifespan of the pane.

Homeowners often ask whether they should stick with the same type of glass that was originally installed or if upgrading to double-pane makes sense in every situation.

Questions You May Have About Glass Types

What is the main difference between single-pane and double-pane glass?
Single-pane glass is one layer of glass, while double-pane glass consists of two layers with a sealed space between them that is filled with air or gas. The sealed space provides insulation that reduces heat transfer and noise.
When should I replace single-pane glass with double-pane?
You should consider upgrading if the room is uncomfortable due to drafts or temperature swings, or if you want to reduce energy costs. Double-pane glass performs better in climates with cold winters and hot summers like Rockville.
How long does double-pane glass last?
Double-pane glass can last 15 to 20 years or longer if the seals remain intact and the window is not exposed to extreme stress. Seal failure is the most common reason for early replacement.
What causes double-pane glass to fog up?
Fogging happens when the seal around the glass unit breaks and moisture enters the space between the panes. Once moisture is inside, it cannot dry out and will condense whenever the temperature changes.
Why does single-pane glass feel colder in winter?
Single-pane glass has no insulating layer, so it conducts heat directly from the warm interior to the cold exterior. You feel the cold surface because the glass temperature drops close to the outside air temperature.

Potomac Glass Repair works with both single-pane and double-pane glass in homes across Rockville, helping homeowners match the right glass type to their needs and budget. 


To discuss your windows and schedule service, call (202) 740-6600.