Say goodbye to tape, weatherstrips, and plastic wrap
Block cold & drafts with
custom window inserts
Long-term, year-round insulation that fits your home aesthetic
Long-Lasting Seals & Insulating Materials
Custom-fit inserts use a tight seal that holds up over time. We use highly insulating materials and low-conductivity hardware to effectively block cold and help reduce energy use.
Fits Every NYC Window
Engineered to insulate while preserving window access across pre-war, brownstone, floor-to-ceiling, tilt-out, crank-out, oversized, and irregular windows — including configurations with window AC units.
Full-Service, Hassle-Free Installation
Our NYC-based team handles measurement, fabrication, and installation. Most projects are completed within 7–10 business days.
Minimalist Design That Fits Tight Spaces
Our inserts are barely noticieable post installation and fit on shallow window frames or behind shades with as little as ½″ of space.
How It Works
Consult
We work with you to best insert system for your home's design and window usage habits.
Measure & Build
We take precise measurements and custom-build your inserts in our NYC workshop for a perfect fit.
Install
We deliver within 7–10 business days—with full-service installation to bring warmth to your home.
Two Custom Systems —
We'll Recommend the Best One for You
Both systems are renter-friendly and professionally installed.
During your consultation, we'll recommend the system that performs best for your window setup and everyday usage.
Compression Inserts
No-Drill, Invisible Insulation- ✓Barely noticeable post-installation
- ✓Protects and preserves specialty and historic windows
- ✓Seamless look and custom fitted for non-rectangular and floor-to-ceiling windows
- ✓Zero construction tension mechanism — no-drill, no adhesives
- ✓Fits behind shades and within window frames that are just 1/2" deep
- ✓Proprietary fit-adjustment mechanism for tight seal and better performance on uneven frames
Magnetic Inserts
Versatile, Easy Window Access- ✓Fits all window customizations , including window AC, floor heaters, and more
- ✓Easy window access with modular pieces that snap on and off
- ✓Modular configurations for extra-large or multi-pane windows
- ✓Long-lasting magnetic mechanism maintains tight seal over time
- ✓Light mounting — renter-friendly and fully reversible with small patchable mounting points
Customized to Each Home
We work with each customer to make sure our panels look and work the best for you.
Invisible Insulation for Tribeca Loft with Arched Windows
Magnetic Panels for Easy Window & Sill Access
Insulation behind shades for Corner Windows
Insulation where Windows Still Open
Why Professional Installation Matters
| Feature | Self-Install Kits | Whisper Windows |
|---|---|---|
| Measurements | XSelf-measurement prone to errors | ✓Professional, precise measurement |
| Fit & Seal | XGaps or imperfect seals let in cold drafts | ✓Custom-fit and adjusted on-site for a tight seal |
| Window Access | XWindows sealed off for the season | ✓Year-round insulation with easy window access in seconds |
| Installation | XUnpack, orient, adjust window treatments, and install hardware yourself | ✓Full-service installation by our team |
| Custom Optimizations | XYou choose product type and placement alone | ✓We recommend the ideal configuration on-site for your window type and thermal profile |
| Cost | ✓Lower cost for thin film-based insulation products | ✓Similar cost as DIY insulating acrylic inserts—with full service included ✓Often cheaper than shipped inserts for oversized windows |
More Effective Insulation Than Replacement Windows
Our inserts use materials that seal more effectively and are less thermally conductive than typical hinged or tracked windows. Acrylic panels also block more UV than glass, helping reduce summer heat and protect interiors from fading.
Simple, Transparent Pricing
Most NYC projects range from $600–$1,200 per window, depending on size and configuration.
Ready to feel warmer at home?
Complete the form below to get your free quote.
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Shipping To All Contiguous-US