Historic home with traditional windows

Horizontal Storm Windows

Custom sizes, considered details, and an extra layer of comfort for your existing windows.

3 Windows

Choosing Horizontal Storm Windows

For wide openings, compare two-lite and three-lite layouts, which panel opens, and the position of your existing vertical meeting rails. Confirm the opening direction before ordering.

Start with where your storm window will mount and how your existing window opens. Explore interior storm windows for an inside-mounted layer, exterior storm windows for fixed or ventilating openings, or specialty storm windows for distinctive shapes. Check the mounting requirements and use our measuring guides before ordering.

What affects the price?

Dimensions determine the size of your frame and glass. Glass options, frame finish, and configuration—including fixed or operating panels, track count, and specialty shapes—also affect the price. Configure your chosen product for available pricing, or request a quote for details that need review.

Make the Most of Your Windows

FAQs

Which window styles pair best with horizontal storm windows?

They are the go-to choice for casement windows, horizontal sliders, and any opening wider than it is tall where side-to-side panel movement is needed.

How do dual-rail and three-rail horizontal models differ?

Dual-rail models use two tracks for a glass panel and a screen, simple and economical. Three-rail models add an extra track, letting you position two screens for broader ventilation options.

Can I slide the panels to either side for airflow?

Yes. The sliding panels can be repositioned within the frame, and with the horizontal two-track you can also choose which side holds the operable pane.

Do horizontal storm windows save energy?

They trap an insulating air layer between the storm panel and your primary glass, which limits conductive heat loss and reduces air leakage around the frame.

How should I measure for a horizontal slider storm window?

Measure the opening width and height in at least three spots, use the smallest reading for each dimension, and consult our measuring guide for product-specific rules.

A Good Fit, from the Start

Made to Your Measurements

Custom sizes for the windows already in your home.

Keep What You Love

Add a protective layer while keeping your existing windows.

Choose Your Details

Compare frame finishes, glass, and opening styles before ordering.

Help Along the Way

Measuring and installation guides, with a team you can contact for help.

Side-sliding storm windows are made for wide openings, casement-style frames, sliders, and rooms where horizontal operation feels natural. Choose a two-track model for simple protection or a three-track model when you want more ventilation flexibility.

Ideal Applications

Casement Openings

The side-glide motion mirrors how casement sashes swing, so the storm panel feels like a natural extension of the window rather than an add-on. Tight perimeter seals lock out drafts year-round.

Patio Door Transoms

Cover the fixed or sliding glass above patio doors to cut heat loss across that wide span while preserving sightlines and easy access to the door below.

Modern & Mid-Century Facades

Low-profile aluminum frames and horizontal operation complement ribbon windows, clerestories, and other wide-format glass common in modern and mid-century architecture.

Multi-Pane Ribbon Windows

When several windows sit side by side in a continuous band, horizontal storm panels span the full width efficiently and keep every section sealed against weather and noise.

Office & Commercial Glass

Durable powder-coated aluminum stands up to high-traffic settings, and the sliding panels let maintenance crews clean both sides without special equipment.

Whole-Home Energy Upgrades

Retrofit every horizontal opening in one project, the trapped air layer between storm panel and primary glass noticeably reduces heating and cooling demand.

Technical Specifications

Two-Track Configuration

Frame Construction
Solid Aluminum
Track Configuration
Two Parallel Tracks
Screen Panels
One Removable Screen
Weatherstripping
Dual Compression Seals
Warranty
Lifetime Limited

Triple-Track Configuration

Frame Construction
Tubular Aluminum
Track Configuration
Three Parallel Tracks
Screen Panels
Two Removable Screens
Weatherstripping
Triple Compression Seals
Warranty
Lifetime Limited

Homeowner-Friendly Install

Most homeowners mount a horizontal storm window in under an hour using a drill, a level, and the included fasteners, no contractor visit required.

  1. 1.Capture width and height at three points across the opening using our illustrated measuring guide.
  2. 2.Position the frame against the exterior casing and fasten through the pre-drilled mounting holes.
  3. 3.Slide the panels back and forth to confirm smooth tracking and a tight perimeter seal.

Minimal Upkeep

Factory-finished aluminum and lift-out panels make these storm windows easy to maintain season after season.

  • Lift-Out Screens: Pop out in seconds for rinsing or replacement
  • Factory Finish: Choose Mill, White, Tan, Bronze, or Black
  • Precision Rails: Interlock design keeps tracks free of debris buildup

Start Your Horizontal Storm Window Project

Configure a side-sliding storm panel for every casement and slider opening in your home.

Get StartedContact Us

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