Climate Seal Window Inserts

Overview

Climate Seal has been making magnetic interior storm windows for close to thirty years, and its customer list reads like a preservation register: historic landmarks, museums, and National Park Service buildings where the original windows cannot be touched. The system is simple. A thin steel subframe is fixed to the inside of the window casing. The acrylic panel carries a magnetic vinyl extrusion around its perimeter. The panel snaps to the frame with a seal the company describes as virtually airtight, and lifts off in seconds when you want it gone.

It is our Best for Noise pick in the storm window roundup. This review covers what separates it from a generic magnetic panel, what the series mean, and why the DIY experience gets mixed marks.

The bellows

Acrylic expands and contracts with temperature about eight times more than glass. On a large panel that movement bows the sheet and, on a plain magnetic strip, peels a corner off the frame. Climate Seal builds a bellows into the molding so the sheet can grow in its own plane without deforming. That detail is the difference between a magnetic insert that stays sealed through a January cold snap and an August heat wave and one that does not. The vinyl extrusion is also a far better insulator than the aluminum frames on some competing systems.

Series

• Thermal Series is the everyday product: standard 1/8-inch acrylic aimed at heating and cooling savings, with up to 60 percent sound abatement claimed.
• Acoustic Series steps up to 1/4-inch acrylic, and up to 5/16 inch for maximum performance, with acoustically rated weather stripping. Climate Seal claims an STC rating of up to 49 and up to 80 percent sound reduction, the strongest published numbers in this category.
• Preservation Series is configured for historic buildings, where reversibility and invisibility from the street are the requirements.
• Pro Series uses abrasion-resistant acrylic in 1/8 or 1/4 inch and is built for exterior and commercial use.

The acrylic is guaranteed against yellowing and clouding for ten years and is about 17 times more impact-resistant than glass of the same thickness.

Performance

Owners who have them are happy with the product itself. Testimonials on the company's site report inserts that went in perfectly, look clean, and delivered immediately noticeable sound attenuation. A Trustpilot reviewer confirmed the panels "block drafts and sound" well. We found no reports of seal failure or fogging, which is consistent with a magnetic system that allows for expansion.

The physics is the same as any sealed acrylic panel: a dead-air gap that roughly doubles resistance to conductive heat loss and stops air infiltration. As with Indow, the acoustic result depends on the air gap between insert and glass as much as on the acrylic thickness. We have not tested these ourselves.

The DIY problem

Climate Seal's online footprint is small, two Trustpilot reviews at a 3.4 average, and both say the same thing: the product is good and the instructions are not. One customer wrote that clear directions for installation were "almost totally lacking" and had to phone repeatedly for basics. Another, who had spent several thousand dollars, was told by email that a follow-up project was too small and complicated to take on. The owner was described as friendly; the documentation and the appetite for small residential jobs were the complaints.

Read that as a signal about who the company serves. Climate Seal is built for institutions, contractors, and large residential projects. A homeowner with four windows and a screwdriver will get a good insert and should expect to work for the installation.

Price

Not published. Every job is quoted by the company or a dealer. Expect it to land in the same broad band as Indow, around $250 to $400 per typical window for the Thermal Series, with the Acoustic Series higher and installation on top if you hire it.

Who should buy it

Buy Climate Seal for a noise problem serious enough to want an STC rating, for windows you will take out every summer, for a historic building that needs a preservation-grade reversible insert, or for a commercial job in the Pro Series. Buy it with an installer or the patience to call.

Buy Indow if you want the insert measured and made for you with a Snug Fit guarantee and a deep review record. Buy a Window Savers kit if you want magnetic mounting at a fraction of the price and do not mind building the panels.

Sources

• Climate Seal: home, Thermal Series, Acoustic Series and Acoustic Series window inserts, Pro Series, Preservation, product benefits, and testimonials
• Trustpilot: climateseal.com
• Acoustical Surfaces: Climate Seal acoustic window inserts
• Home-Adviser: Magnetic interior storm window inserts