Window Insulation Tips and Tricks

Window Insulation Tips and TricksEnsuring your home has adequate window insulation also ensures that sunlight and a nice view of the outdoors aren’t accompanied by excess heat loss in winter and heat gain in summer.

Windows are an often overlooked source of air infiltration that can boost heating/cooling expenses in any season. The sum total of energy loss from all leaky windows in a house can equal the effect of leaving one window open 24/7/365. This also over-burdens your furnace or air conditioner, resulting in longer operating cycles to maintain indoor temperatures and increasing system wear and tear.

Restoring window insulation isn’t high-tech stuff. It’s just a matter of closing gaps that allow air infiltration. Here are some suggestions to get the job done:


If you can feel drafts around the window and frame—a cold windy day presents a good opportunity to find them—seal small gaps with caulking. Use latex caulk for openings in the wooden sash and silicone caulk to close gaps that contact glass or metal. Caulking doesn’t last forever, so be prepared to repeat the process in a few years.


The gap between moving segments of the window is usually sealed by felt and/or vinyl weatherstripping. These materials are affected by age and wear and tear as the window is opened and closed. Use adhesive felt to seal along the top and bottom where the window contacts the sash and vinyl or rubber “V-strips” to line the inside of V-channels where the window slides.

Window Film

Transparent plastic window film is an inexpensive recourse to seal the entire opening. The film is attached to the wooden frame surrounding the entire window with special double-sided tape. Once the window is fully enclosed, heat is applied to the fiom with a hair dryer or heat gun, causing it to shrink into an air-tight covering that keeps out external drafts . Because it’s an easy DIY procedure, window film is often a seasonal option during cold winters and is removed during summer.

For more energy-saving tips like window insulation, contact Paitson Bros., the Wabash Valley’s preferred HVAC sales and service provider since 1922.

Our goal is to help educate our customers in Terre Haute, Indiana about energy and home comfort issues (specific to HVAC systems). For more information about other HVAC topics, download our free Home Comfort Guide or call us at 812-645-6859. 

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