How Efficient Are Your Windows? Three Ways To Check

Katelyn Lewis • January 5, 2023

Windows are one of the most-common places for your home to lose its heat, and non-efficient windows can cause you to lose hundreds to thousands of dollars annually on your heating and cooling bills.

After photo of RETEX insulated vinyl siding and window replacement in North Chesterfield VA 23235.

In fact, the U.S. Department of Energy estimates heat gain and loss through windows are responsible for 25% to 30% of residential heating and cooling energy use.


Knowing whether your windows are performing optimally, therefore, is critical for your home’s comfortability and energy efficiency.


Here are three ways to check your windows’ efficiency:


1. Look for gaps between the window frames and your home’s siding. Any cracks or dryness in your window’s glazing – the hard, putty-like substance holding the individual glass panes in place – also offers a chance for moisture or heat to transfer.


2. Use (or hire someone to use) Infrared laser thermometers and U-Value kits for a more high-tech testing option. If a window is leaking, it should register a colder temperature than the rest of the room.


3. Tape a small piece of plastic wrap on a pen and then hold it next to your windows. If the plastic wrap moves, your windows are drafty and non-efficient.


Don’t toss money straight out the window, so to speak. Give our Retex team a call at 804-258-6300 to tell us more about your window needs.

Our Window Services
RETEX roof installation in North Chesterfield, VA.
By Katelyn Lewis April 21, 2026
Montpelier homeowner Caroline Balita reached out to RETEX in September 2025 for an estimate for replacing her roof, referred to us by her real estate agent.
Retex roof and black gutter replacement in Richmond, VA.
By Katelyn Lewis April 16, 2026
RETEX replaced this Richmond homeowner’s roof and gutters with Tamko Heritage architectural shingles and black 6-inch seamless gutters in November 2025.
Roof Replacement in Mechanicsville, VA.
By Katelyn Lewis April 15, 2026
These early warning signs can signal it's time to replace your roof.
RETEX gutter installation in Chesterfield, Va.
By Katelyn Lewis April 14, 2026
Mineral homeowner Barrett Mcleod reached out to RETEX in May 2025 for an estimate for replacing his home’s siding, 5 windows, gutters. and gutter guards.
Hardie Plank fiber cement siding replacement in Richmond, VA.
By Katelyn Lewis April 8, 2026
In Virginia’s humid, storm-prone climate, durable siding makes all the difference.
Stock image of bunny in meadow.
By Katelyn Lewis April 5, 2026
This holiday is about more than chocolate bunnies and egg hunts.
Richmond street view during rain storm.
By Katelyn Lewis April 2, 2026
High winds and heavy rain can expose weak spots in your roof, siding, gutters, and windows.
Repair Team Alpha in front of RETEX repair van.
By Katelyn Lewis April 1, 2026
We’ll check your shingles, top off your granules, rotate your ridge caps, and vacuum out your gutters.
Siding replacement in North Chesterfield Va.
By Katelyn Lewis March 31, 2026
This North Chesterfield homeowner wanted to replace her home’s gutters, and she found us on Google.
Retex roof replacement in Stafford, Va.
By Katelyn Lewis March 27, 2026
This Stafford homeowner reached out to Retex in July 2025 for an assessment of her roof – she wasn’t sure if it needed to be repaired or replaced.