Address drafts and heat transfer together
An added panel creates an air space alongside your existing glass. A close fit helps limit drafts, while the glazing affects heat transfer. Before buying, inspect the primary window and its surrounding frame: a new panel cannot correct water entry or structural damage.
Explore storm window benefitsUnderstand what Low-E adds
Low-emissivity, or Low-E, coatings reduce radiant heat transfer through glass. They offer a different function from tint or a screen. The best choice depends on the existing window, climate, sun exposure, and the glazing options offered for the selected system.
Shop Low-E interior storm windowsChoose a mounting system that fits
Compare interior and exterior mounting before choosing glazing. Check the space available for the frame and the clearance needed for operating hardware. Proper installation and maintained weatherseals matter alongside the glass selection.
Shop exterior storm windowsSet realistic expectations for savings
Energy results vary with climate, existing windows, air leakage, installation, and heating and cooling use. Do not treat a general savings estimate as a guaranteed reduction in your bill. Compare product-specific performance information when available; Low-E glass alone does not establish ENERGY STAR certification.
Ask about product optionsInspect the existing window before upgrading
Look for loose or missing weatherstripping, gaps around the sash, damaged glazing, and signs of water entry. Note whether the discomfort is a draft around the edge or a cold sensation near the glass. Those observations help distinguish air leakage from heat transfer. Repairs to the primary window may be needed alongside a storm panel, particularly where the surround is too damaged to support a secure attachment.
Evaluate the existing storm windowKeep the installed system performing
After installation, check that operating panels close fully and that seals meet evenly. Inspect exterior drainage openings and keep them clear. If condensation persists, investigate moisture sources and the installation rather than simply sealing every visible opening. During seasonal cleaning, check loose hardware and damaged seals so the system continues to fit as intended.
Follow the care guide