From windows in your living room, to the pipes in your basement, from the gutters on your roof, to the AC unit in your backyard;
Thermwell has the right product at the right price to save you money and energy.

The Frost King Family of companies...

Frost King

For more than 60 years, Frost King has been the nation's #1 and most trusted brand of packaged weatherstripping. With an unsurpassed selection of more than 2,000 products, the entire line of Frost King weatherstripping is made with one goal in mind - to save the consumer money and energy in every room of the house. Frost King products are found in more than 10,000 stores nationwide and around the world.


A manufacturer and designer of roll slitters, log slitters, lathe slitters, baloney slitters, single knife slitter machines and bias binding machines. For more than 50 years Manufacturers around the world have trusted Lever Machines.


Founded more than 100 years ago in Urbana, Ohio, W.B. Marvin introduced the first metal rail adjustable screen in 1936. Today, as part of the Frost King Family, WB Marvin is the leader in the adjustable screen market with screens to fit almost every window.


Based in Paterson NJ, Filmco is a world class extruder of polyethylene sheeting, drop cloths, trash bags, contractor clean-up bags and window insulation kits. Found in more than 3,000 stores nationwide, Filmco and tarps are used around the country and world to keep homes and constructions sites clean.


Used by generations of handymen, Mortite Caulking Cord is the original name in do-it-yourself caulking, famous for its quality, versatility and ease of use. The entire line of Mortite caulking is perfect for just about any job, from gasket material to sound deadener, from insect barrier to general "plugger-upper." Just Peel, Press and your done.


The decades old Regent Tape line of adhesive products has everything the contractor and consumer needs to solve their home painting needs. From masking clean release tape to painters tape to a full line of electrical tape, Regent has what every painter needs.


America's #1 brand of automotive weather-stripping and insulation. Seal-rite insulation reduces or eliminates rattles and vibrations in just about any vehicle, from car doors, windows, hoods, trucks, to camper bodies, boat hatches and more.


Since 1957 PortaSeal products have been keeping America's front doors, back doors and garage doors weather tight and draft free. Specializing in self adjusting designs for Residential Doors, Garage Door Top & Sides, and Garage Door Bottoms, the entire line of PortaSeal products are made to keep the weather at bay.