Thermwell V73/3H Shrink Window Insulation Kit 3 Pack

Product Description

The THERMWELL V73/3H is an indoor shrink window insulation kit designed to reduce drafts and heat loss through standard-size windows. Each kit includes a crystal-clear plastic sheet measuring 42 inches x 62 inches that shrinks tight and wrinkle-free when heated with a standard handheld hair dryer. The plastic film installs using the included double-face tape, which adheres to metal, painted wood, varnished wood, or vinyl-clad window frames. This 3-pack format is suited for contractors, property managers, and service techs completing seasonal weatherization on multiple units in a single visit.

The V73/3H is intended for residential interior window applications where air sealing and thermal performance need to be improved without replacing the window itself. The kit is a common solution for older single-pane windows, drafty frames, and budget-conscious weatherization projects in residential and light commercial settings. The clear film maintains visibility after installation and is applied from the interior side of the window.

Key Features

• Crystal-clear film shrinks wrinkle-free using a standard handheld hair dryer — no special tools required
• Sheet size: 42 inches x 62 inches per panel, suitable for standard residential windows
• Includes double-face tape for adhesion to metal, painted wood, varnished wood, and vinyl-clad frames
• 3-pack format supports multi-window jobs in a single installation session
• Interior installation maintains natural light and outward visibility after application

Compatibility

Designed for interior installation on standard residential windows with frame materials including metal, painted wood, varnished wood, and vinyl-clad surfaces. Each sheet covers openings up to 42 inches x 62 inches.

Installation Notes

Installation is performed by weatherization technicians, general contractors, or knowledgeable property maintenance staff. Clean the window frame thoroughly before applying the double-face tape to ensure proper adhesion. Apply the plastic sheet to the tape, then use a handheld hair dryer on a low-to-medium setting to shrink the film tight across the frame. Avoid using an open-flame heat source — use only an electric hair dryer as intended.