Larson Sidelite Storm Panel with Clear Glass

Larson’s sidelite storm panels cut energy loss by up to 60% — the kind of measurable performance that matters when Montana temperatures swing from 90°F in summer to -30°F in winter. These aren’t decorative add-ons. They’re engineered energy barriers that solve the chronic draft problem plaguing entry door sidelites.

The panels transform leaky sidelites into insulated barriers without the expense and disruption of full window replacement. Standard clear glass maintains full visibility through 1/8-inch tempered safety glass, while the aluminum frame handles Montana’s temperature extremes without warping or corroding.

Energy Performance and Specifications

The 60% energy loss reduction comes from creating a sealed air pocket between the existing sidelite and the storm panel — basic physics that works. Low-E glass options on the L705 models push efficiency even higher by reflecting radiant heat.

Specification	Value	Source
Energy Loss Reduction	Up to 60%	Manufacturer
Glass Type	1/8” tempered safety glass	Manufacturer
Frame Material	Maintenance-free aluminum	Manufacturer
Standard Height	81 inches	Manufacturer
Maximum Height	96 inches with expander	Manufacturer
Safety Certification	ANSI Z97.1	Manufacturer
Warranty	10-year limited	Manufacturer

Four standard widths handle most residential sidelites: 11-7/8”, 12”, 13-7/8”, and 14”. Custom sizing availability means odd-sized openings don’t derail the project. The aluminum frame resists the corrosion that destroys steel components in Montana’s freeze-thaw cycles.

Installation and Professional Considerations

The overlap mount design saves contractors from precision fitting nightmares. Panels build with approximately 1/2 inch overlap margin — enough forgiveness for real-world installations where nothing’s perfectly square.

Installation follows a straightforward sequence: position panel over exterior opening, drill pilot holes, secure with mounting screws, attach screw-cap covers, and add bottom expander if needed. Exterior-removable via mounting screws means seasonal removal doesn’t require interior access — practical for vacation homes.

The DIY-friendly design reduces callbacks. Homeowners can handle basic installations themselves, freeing contractors for more complex work. Two styles available with overlap and inside mount options accommodate different sidelite configurations.

The Bottom Line

These panels solve real problems. Drafty sidelites waste energy and create comfort issues near entry doors. Full window replacement runs thousands. Larson’s storm panels deliver most of the energy benefit at a fraction of the cost.

The L703 serves as the entry-level clear glass option, while the L705 adds decorative appeal and Low-E glass capability. Both use the same proven aluminum frame construction and tempered safety glass.

For Montana contractors dealing with energy-conscious clients, these panels offer a smart middle ground. They’re not as thorough as full window replacement, but they’re far more effective than weatherstripping and caulk. The 10-year warranty backs up the durability claims.

FAQ

What’s the actual energy savings from installing these panels?

Manufacturer testing shows up to 60% reduction in energy loss through sidelites. Real-world savings depend on the existing sidelite condition and home heating patterns. The worse the original seal, the more dramatic the improvement.

Do these panels work with all sidelite configurations?

Panels fit standard residential entry door sidelites, with custom sizes available for non-standard openings up to 96 inches tall. Both overlap and inside mount options handle different frame types.

Can homeowners install these themselves?

The overlap mount design enables DIY installation. Basic tools required: drill, level, and screwdriver. The forgiving overlap margin helps compensate for minor measurement errors.

What’s included with each panel?

Each kit includes the tempered glass sash, aluminum frame components, mounting screws, screw-cap covers, and adjustable bottom expander on select sizes. Everything needed for basic installation ships with the panel.

How do the L703 and L705 models differ?

L703 is the standard clear glass panel, while L705 is the premium version with decorative options and Low-E glass availability. Frame dimensions vary slightly between models. Both use the same mounting system and safety glass standards.