Certified performanceWhat does ENERGY STAR certified mean?
ENERGY STAR is the EPA’s label for energy-efficient products. Here is what it tells you about a storm window, what the EPA estimates you can save, and which of our windows have earned it.
- $350
- a year
- Average savings on heating and cooling
- 10%
- of your bills
- Over single-pane clear glass with no storm window
- 3 years
- to pay back
- The added cost of a certified storm window
EPA estimates for ENERGY STAR certified low-e storm windows, which the EPA calls conservative. Your savings depend on your climate, your home and your utility rates.
A rare seal
29 of the 30 ENERGY STAR certified storm window listings in the country are windows we offer.
Most storm windows on the market have never earned it. If you want the EPA’s savings estimate to apply to your windows, the window has to be on this list.
29of30
certified listings nationwide are windows we offer. Each icon is one listing: a model in one climate zone or glass option.
Source: EPA ENERGY STAR certified storm window data, checked October 2, 2026.
What the government seal means
ENERGY STAR is a program of the U.S. Environmental Protection Agency. The EPA sets the performance requirements for storm windows, and a window is independently certified against them. The result is listed publicly, model by model and for a specific climate zone. A company cannot simply put the logo on a window; only a listed model may carry it.
How a window earns the label
Tested
The window is evaluated for how much air it lets through and how well its Low-E glass holds heat, for a specific climate zone.
Certified
The result is independently certified and the model is listed with its climate zone. Certification belongs to the model, not the brand.
Labeled
Only listed models may carry the ENERGY STAR mark, which is why you will see it on some of our windows and not others.
Our certified windows
These models carry the ENERGY STAR logo. Each one is made to your measurements.
Aluminum Exterior Low-E Picture Window
Northern and Southern climate zones
Aluminum Exterior Low-E Double Hung
Northern and Southern climate zones
Aluminum Exterior Low-E Slider
Northern and Southern climate zones
Low-E Aluminum Fixed Interior Storm Window
Northern climate zone
Low-E Aluminum Double-Hung Interior Storm Window with Screen
Northern climate zone
Slim Low-E Aluminum Double-Hung Interior Storm Window
Northern climate zone
Low-E Aluminum Sliding Interior Storm Window with Screen
Northern climate zone
Slim Low-E Aluminum Sliding Interior Storm Window
Northern climate zone
Direct-Mount Low-E Aluminum Storm Panel
Northern and Southern climate zones
Architectural Aluminum Exterior Double Hung
Northern and Southern climate zones
Architectural Aluminum Exterior Slider
Northern and Southern climate zones
Compression-Fit Vinyl Interior Storm Window
Northern climate zone
Certification is listed model by model, so not every window we sell carries the label. The product page for each window tells you whether it does.
Which of our windows are certified for you
Your zoneFind your ENERGY STAR zone
Enter your ZIP code to see which of our windows are certified for your climate.
What certification does and does not do
It tells you that independent testing backs the window’s air leakage and Low-E glass performance for the climate zone it is listed for. It does not repair a damaged window, and it does not promise a savings figure for your house.
Fit still matters. A made-to-measure window installed to the instructions will perform better than a loose one, so make sure the original window is sound before you add a storm window.
FAQs
How rare is ENERGY STAR certification for storm windows?
Very rare. The EPA’s certified storm window list had just 30 listings when we last checked (October 2026). 29 of the 30 are windows we offer.
What does ENERGY STAR certified mean?
It means the specific model has been tested and listed as meeting the ENERGY STAR program’s performance requirements for its product type and climate zone.
Are all of your windows ENERGY STAR certified?
No. Certification is model by model. Most of our Low-E aluminum storm windows, including the architectural exterior double-hung and slider, and our vinyl interior compression window are certified. Look for the ENERGY STAR logo on the product photo and the certified line on the product page.
How do I know a window is certified?
Certified windows carry the ENERGY STAR logo on their photo in our collections and a certified line on their product page, with the climate zone and ratings. If you would like the certification listing for a model, ask us and we will send it.
How much does the EPA say storm windows save?
The EPA estimates that certified low-e storm windows save homeowners about $350 a year, roughly 10 percent of heating and cooling bills, over single-pane clear glass windows without existing storm windows.
How long does it take to pay back the extra cost?
The EPA estimates the incremental cost of ENERGY STAR certified storm windows pays back in about three years. The EPA calls these estimates conservative.
What are the Northern and Southern climate zones?
ENERGY STAR certifies products for particular climate zones. Northern-zone models are evaluated for colder climates and Southern-zone models for warmer ones, so choose a window rated for where you live.
Does certification apply to the whole window?
The certification applies to the storm window model as tested and listed. It does not rate your existing window or your installation, so make sure the original window is sound and the storm window is installed to the instructions.
Source: ENERGY STAR: Storm Windows (U.S. Environmental Protection Agency)
Find the right storm window for your home
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