Lincoln Windows & Patio Doors


Have a question that could not be answered by reviewing the other pages of our website? Try browsing through our Frequently Asked Questions below. Simply click on a question to view the answer. If you still cannot find what you are looking for or if you need more information, feel free to contact us.

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Why is there moisture forming on the interior pane of my windows?

Moisture on the inside pane of a window is called condensation.  Condensation simply stated occurs when the surface temperature of the glass is below the dew point temperature of the air in your home. Dew point is defined as saturation vapor density of when the air reaches 100% relative humidity and can hold no more moisture it has reached the dew point. 

Relative humidity is a comparison of the actual vapor density versus the saturation vapor density at a particular temperature.  Dew point is 100% relative humidity or the point where the air, at that temperature, is no longer able to hold any more moisture.  If the air has reached vapor saturation (100% relative humidity) then the air will release moisture onto the surface of the glass, the same way condensation would form on the outside of a cold beverage container. 

See our Owner’s Manual for further explanation and recommendations to reduce condensation.

What is the difference between condensation and seal failure?

Where condensation is moisture on the inside pane of a window, seal failure occurs when moisture is present in between two panes of insulated glass. You can detect seal failure when the glass becomes “foggy” or appears to be dirty and cannot be cleaned. The only way to correct a seal failed piece of glass is to replace the glass or the sash.

Is it possible to have moisture or condensation on the exterior surface of my windows?

Yes, under the right conditions it is possible. It can be present on coated glass products or glass that has a higher insulating value than standard insulated glass. The right conditions include high relative outdoor humidity, still air; glass temperature below the dew point temperature. Exposed to these conditions, the outdoor glass surface can radiate heat away and the outdoor glass temperature can fall below the dew point of the ambient air. When this occurs, moisture from the air can condense on the outdoor surface of the glass. This is similar to moisture or dew on lawns or on automobiles when exposed to the same natural occurring phenomena.

How should I clean my windows?

A mild soap and water solution or a vinegar and water solution should be used with a soft cloth or sponge to remove dirt and debris. See our Owner's Manual for further recommendations on window cleaning.

Do my windows require maintenance?

All windows should be inspected annually. The type of windows you have and the local climate affects what type and how often maintenance is required. It is recommended that you should also inspect the perimeter sealant joint surrounding your windows and doors.

I am having trouble with my windows how do I initiate a service request?

A service request can be submitted by fax at (715) 536.9783 or by contacting your local dealer or warranty center.

What is the warranty on my windows?

Lincoln windows and patio doors carry a Limited Lifetime Warranty. See our Warranties page for details. There you will find the current warranty as well as any previous warranties.  Products are covered under the warranty that was in effect on the date of manufacture so you should use the year your windows were purchased as a guide to which warranty is pertinent.

How soon should I finish the interior wood surfaces of my windows?

We recommend sealing or finishing the wood surfaces as soon as possible after installation. See our Owner’s Manual for detailed finishing instructions.

Where do I find my warranty code?

The warranty code is etched in a corner on the glass or the spacer channel between the panes of glass. The code that is etched in the corner of the glass will have an “L” with two lines of numbers above it. The first line will be for the month and year of manufacture. The second line will contain the order number and line number for the particular window. This etching will be found in either the upper right or bottom left hand corner of the glass.

Glass codes found on the spacer channel are located between the panes of glass and would have the date produced (i.e. Dec. 14 1999 LWP) or a six digit number (i.e. 612145).

What are your recommendations for installing my Lincoln Windows?

Lincoln recommends following the AAMA (American Architectural Manufacturers Association) Installation Masters guidelines, which utilize standards that are nationally recognized instructions pertaining to the installation of windows and doors.  Our instructions are product specific and are written following the AAMA guidelines.

Where can I find replacement parts for my windows?

Replacement parts can be purchased through a Lincoln dealer. If a dealer is not convenient, you may contact Lincoln’s Customer Service Center, however shipping charges may apply.

The aluminum exterior on my windows has faded, how can I correct this?

Waxing the aluminum with an automotive type wax may prolong the finish life and restore faded aluminum. Use non abrasive wax and follow the manufacturers instructions.

Additionally, exterior sash and frame aluminum cladding should be cleaned periodically using a soft cloth, brush, or sponge and a mixture of mild soap and warm water. Rinse thoroughly with clean water and dry with a soft cloth. Mineral spirits or a solution of water and denatured alcohol can be used on stubborn dirt.  Cleaning should be done on the shady side of the building or on a mild cloudy day. Do not clean hot, sun heated surfaces.

Further information on care and cleaning of aluminum cladding can be found on the American Architectural Manufactures Association (AAMA) web site at

The finish on my door handles is fading, how can I get this repaired?

Weathering of exposed hardware finishes may vary and is not considered a defect.  To prolong finish life, clean with mild soap and water at regular intervals (at least every three months). An automotive type wax can be used to help prolong the finish. Use a wax that does not contain abrasives and follow the manufacturers instructions. Do not use wax on oil rubbed finishes.  Product damage may occur.

The Oil-Rubbed finish is a “living finish” and color change will occur over time depending on usage and weather conditions. Variations in color from one piece to another are not uncommon. To clean, pat gently with a damp, soft, clean cloth and pat dry.

Replacement hardware can be purchased through a Lincoln dealer.

Can I apply a reflective film to my windows to reduce the amount of ultraviolet rays?

We do not recommend applying a reflective film to insulated glass. Doing so will void the warranty for seal failure. Applying a reflective film could cause the insulated glass unit to prematurely fail by heating up the interior air space of the sealed unit therefore causing the glass unit to develop moisture in between the two panes of glass.