About

Frost King & Thermwell Products Co., Inc.

Frost King & Thermwell Products Co., Inc.
Frost King customers have been feeling the difference for more than 60 years, insulating their homes from the basement to the roof, from front to back.
Frost King is the original

Frost King is the original. It started by inventing the first do-it-yourself weatherstripping kit.

Just 17 feet of felt carpet strips and some nails that ignited America’s DIY revolution. 

Frost King has stayed true to its core values

Since then, Frost King has stayed true to its core values. Ensuring that its products are best-in-class, easy to apply and never look messy while keeping homes warm in the winter and cool in the summer.

No more freezing and hot drafts flowing through and skyrocketing your energy bills.

Keeps frosty winds out
Frost King is the original
Frost King is available at more than 10,000 stores nationwide and many retailers worldwide. Its products cover the entire house – not just doors and windows. Pipes, ducts, electrical outlets, and much more.
Frost King has stayed true to its core values
Since that day when it all started, Frost King has remained the admired market leader in weatherstripping. By reducing your energy bills and making your home cozier - and instantly feeling the difference.
That makes everyone in your home happy.
Where to Buy

Frost King Movie

Thermwell Products Co., Inc.
also manages the following companies:

Lever Lever Manufacturing Corporation Lever Lever Manufacturing Corporation For 90 years, Lever Manufacturing Corporation has been the premier designer and manufacturer of single knife roll slitting machinery and bias binding machinery. Lever offers single knife slitters from manually operated units to fully automatic, programmable logic controlled models. Visit website
W.B. Marvin W.B. Marvin Founded in Urbana, Ohio in 1915, W.B. Marvin introduced it's first metal rail adjustable screen in 1936. and since then, WB Marvin has continued to be a world innovator in replacement windows and screens. Today, WB Marvin is a leader in the adjustable screen market with adjustable screens to fit almost every window.
Mortite Mortite 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. 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.
Regent Tape Regent Tape Regent Tape is an established New England tape manufacturer, producing a complete line of consumer and contractor tapes. Regent Tape has anything the contractor or the consumer needs, including masking clean release, painters and professional grade, package sealing, strapping, and a full line of electrical tape.