Frost King

What Frost King does

Frost King is a US-based weatherization products brand operating under privately held New Jersey corporation Thermwell Products Co., Inc. Founded in 1960, the company manufactures and distributes a broad portfolio of DIY home insulation and sealing products — weatherstripping tapes and gaskets, indoor shrink and EZRoll window kits, pipe and duct insulation, automatic electric heat cables, roof de-icing cables, garage door seals, air conditioner covers and brackets, gutter accessories, door sweeps and thresholds, drop cloths, carpet trim, and paint sundries — across 10,000-plus retail doors including The Home Depot, Lowe's, Menards, Walmart, Canadian Tire, ACE Hardware, and Amazon.

The underlying product technology is rooted in materials science: closed-cell polyethylene foam, EPDM rubber, silicone, tubular vinyl, fiberglass, and foil-backed natural cotton insulation, combined with electromechanical thermostats in heat-cable SKUs. Frost King differentiates on ease of DIY installation (self-sealing adhesives, pre-taped edges, applicator tools) and durability (e.g., 10-year guarantees on EPDM rubber and silicone weatherseals). The brand is supported by a portfolio of acquired and sister labels — Mortite (caulking cord), W.B. Marvin (adjustable window screens), Termwell, and Lever Manufacturing — managed under the same parent.

Frost King's revenue model is one-time hardware sales through retail channel partners; there is no subscription or recurring revenue component. The primary customer segment is the DIY homeowner, with a secondary professional contractor segment served via HDSupply and Home Depot Pro. Go-to-market relies on shelf-space dominance at major home improvement retailers rather than direct-to-consumer e-commerce, augmented by content marketing (how-to videos, blog, interactive Frost King House tool) and social media engagement.

Name

Frost King

Legal name

Thermwell Products Co., Inc.

Website

https://frostking.com

Company type

Private

Founded year

1960

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Frost King is a US-based DIY weatherization products brand under Thermwell Products Co., Inc., manufacturing and distributing insulation, weatherstripping, window kits, heat cables, and home sealing products through major retailers (Home Depot, Lowe's, Walmart, Canadian Tire, Amazon) to DIY homeowners across North America.

Ownership category

akta.pro rank

Product category

Home Weatherization Products

NAICS

Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341), Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing (333415), Home Centers (444110)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Electric Housewares & Fans (3634), Steam & Air-Conditioning Supply (4961)

akta.pro primary industry

HVAC Parts & Supplies Retail (Thermostats, Filters, Ducting) (CRAIADAI)

Keywords

• DIY weatherization products
• Home insulation materials
• Weatherstripping solutions
• Window insulation kits
• Pipe and duct insulation

Headquarters

HQ city

Jersey City

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Personnel, Marketing or Sales, Infrastructure

Revenue model

1. Consumer Weatherization Products: Frost King generates revenue through the sale of weatherization and insulation products to consumers via retail distribution channels. Products include weatherstripping, window kits, pipe insulation, heat cables, garage accessories, air conditioner accessories, door sweeps, and related hardware items sold through major home improvement retailers.
2. Paint Sundries and Hardware: Secondary revenue stream from complementary home improvement products including drop cloths, carpet trim, paint strainers, and painter's accessories sold through the same retail distribution network.

Go-to-market motion1 record

Distribution channels12 records

Marketing channels6 records

Core offering

Frost King manufactures and sells a comprehensive line of DIY home weatherization products, including foam and rubber weatherstripping, indoor shrink and roll-on window insulation kits, foam and rubber pipe insulation, electric heat cables and roof de-icing cables, garage door seals, air conditioner covers and brackets, gutter guards, door sweeps and thresholds, drop cloths, paint sundries, and carpet trim. The company also markets W.B. Marvin adjustable window screens and Mortite caulking cord as managed sub-brands. Products are sold exclusively through third-party retailers including The Home Depot, Lowe's, Menards, Walmart, Canadian Tire, and Amazon rather than direct from the company's website.

Product overview

Frost King is a weatherization products company with over 60 years of experience, offering a comprehensive portfolio of home insulation and energy-efficiency solutions. The company manufactures and sells DIY weatherstripping products (foam tapes, rubber gaskets, silicone seals, expandable foam), window insulation kits (shrink films and roll-on kits), pipe and duct insulation (foam, rubber, fiberglass, natural cotton wraps), heat cables for pipes, roof de-icing cables, garage door seals (Portaseal GaraSeal/GaraBottom systems), air conditioner accessories (covers, brackets, filters), gutter accessories (screens, guards, downspout extenders), door sweeps/thresholds, window screens (W.B. Marvin brand), paint sundries, carpet trim, and drop cloths. The product line is organized by category with sub-brands including Mortite caulking cord, W.B. Marvin window screens, and Portaseal garage seal systems. Frost King products are available at over 10,000 retail stores nationwide including Home Depot, Lowe's, Menards, True Value, Walmart, and Amazon.

Differentiator

Problem solved

Functional benefit

Brands

• Mortite: The original name in do-it-yourself fingertip caulking, famous for quality and versatility. Mortite Weatherstrip and Caulking Cord seals windows effectively and is widely used as gasketing material, sound deadener, insect barrier, crack filler, and general plugger-upper.

Products and services

• Weatherstripping Self-adhesive foam and rubber tapes, tubular gaskets, silicone seals, and expandable foam weatherseals for sealing gaps around windows, doors, and building perimeters to prevent drafts and energy loss. Sold to DIY homeowners through retail partners.
• Window Kits Indoor shrink window insulation kits and EZRoll roll-on window insulation kits for sealing windows during winter to reduce heat loss. Sold to residential DIY consumers.
• Pipe and Duct Insulation Tubular foam and rubber pipe insulation, fiberglass wraps, foil-backed natural cotton insulation, heat deflectors, vent covers, water heater insulation blankets and bases for preventing pipe freezing and reducing energy loss. Sold to DIY homeowners.
• Heat Cables and Roof Cables Automatic electric heat cable kits with built-in thermostats for preventing pipe freezing, and electric roof de-icing cable kits for preventing ice dams in gutters and downspouts. Sold to residential DIY consumers.
• Garage Accessories Garage door bottom seals, side and top weatherseals, and Portaseal GaraSeal and GaraBottom systems for sealing garage doors against drafts, dust, dirt, and water. Sold to residential DIY consumers.
• Air Conditioner Accessories Window AC unit covers (inside and outside), central AC covers, side panels, weatherseals, support brackets, filters, coil cleaners, and odor-fighting pan tablets for seasonal AC protection and efficiency. Sold to residential DIY consumers.
• Gutter Accessories Vinyl snap-in gutter screens, plastic mesh gutter guards, downspout guards and screens, tilt and drain downspout extenders, and gutter scoops for preventing debris clogging. Sold to residential DIY consumers.
• Door Sets Replacement door seals, kerf door seals, and door hardware for sealing and weatherstripping entry doors. Sold to residential DIY consumers.
• Door Sweeps, Door Bottoms and Door Thresholds Automatic aluminum and vinyl door sweeps, adjustable thresholds, drip cap door bottoms, self-stick sweeps, premium heavy-duty sweeps, and replacement vinyl inserts for aluminum and wood thresholds. Sold to residential DIY consumers.
• Drop Cloths and Plastic Sheeting Canvas, paper, and plastic drop cloths, reinforced polyethylene tarps with grommets, contractor cleanup bags, and polyethylene sheeting in various sizes and thicknesses. Sold to residential DIY consumers.
• Carpet Trim Oak wood carpet bars, aluminum stair edging, seam binders, carpet clampdowns, aluminum tile edging, and carpet bars in various finishes for joining and finishing floor coverings. Sold to residential DIY consumers.
• Paint Sundries Cone paint strainers, staining pads, tack cloths, backer rods, painter's coveralls, cleanup rags, cotton cheesecloth, painters' gloves, and absorbent paper and plastic drop cloths for painting projects. Sold to residential DIY consumers.
• W.B. Marvin Adjustable Window Screens Original high-quality adjustable window screens from the W.B. Marvin brand, designed to fit almost every window type and size. Sold to residential DIY consumers under the W.B. Marvin sub-brand managed by Frost King.
• Mortite Caulking Cord Original do-it-yourself fingertip caulking cord famous for quality and versatility, used as gasketing material, sound deadener, insect barrier, crack filler, and general plugger-upper. Available in grey or woodtone. Sold under the Mortite sub-brand managed by Frost King.

Quantifiable outcome

• Indoor Shrink Window Kits can reduce heat loss by as much as 35%
• +2 more outcomes

Named customers3 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

16 partnerships are on record, tiered core and minor.

• The Home DepotcoreChannel Partner/ Reseller/ DistributorMajor national retail partner distributing Frost King weatherization products through Home Depot stores nationwide and Home Depot Pro for professional contractor customers.
• Lowe'scoreChannel Partner/ Reseller/ DistributorMajor national retail partner distributing Frost King products through Lowe's home improvement stores across the United States.
• MenardscoreChannel Partner/ Reseller/ DistributorRegional home improvement retailer partner operating Midwestern stores across multiple states.
• TrueValueminorChannel Partner/ Reseller/ DistributorRegional hardware cooperative retailer partner with independently owned stores.
• Do it BestminorChannel Partner/ Reseller/ DistributorHardware dealer cooperative partner with regional member stores.
• WalmartcoreChannel Partner/ Reseller/ DistributorMajor retail partner distributing Frost King products through Walmart stores and Walmart.com.
• HDSupplyminorChannel Partner/ Reseller/ DistributorProfessional supplier partner serving commercial and professional contractor customers.
• The Home Depot ProminorChannel Partner/ Reseller/ DistributorProfessional division of Home Depot serving commercial and contractor customers with bulk purchasing options.
• ACE HardwareminorChannel Partner/ Reseller/ DistributorHardware cooperative retailer partner with independently owned ACE hardware stores.
• Canadian TirecoreChannel Partner/ Reseller/ DistributorMajor Canadian retail partner distributing Frost King products in Canada through Canadian Tire stores.
• AmazoncoreChannel Partner/ Reseller/ DistributorE-commerce platform partner providing online sales channel for Frost King products with customer review capabilities.
• Jerry's Home ImprovementminorChannel Partner/ Reseller/ DistributorRegional home improvement retailer partner with stores in specific geographic markets.
• W.B. MarvinminorOthersFrost King manages W.B. Marvin, a company founded in Urbana, Ohio in 1915, which introduced its first metal rail adjustable screen in 1936. W.B. Marvin continues to be a world innovator in replacement windows and screens.
• MortiteminorOthersFrost King manages the Mortite brand, 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.
• TermwellminorOthersFrost King manages Termwell, another sister company in the Thermwell Products Co., Inc. portfolio.
• Lever Lever Manufacturing CorporationminorOthersFrost King manages Lever Manufacturing Corporation, which for 90 years has been the premier designer and manufacturer of single knife roll slitting machinery and bias binding machinery.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• M-D Building Products: Direct competitor in the DIY weatherstripping, door seals, and floor/transition trim categories. M-D's product range substantially overlaps with Frost King's weatherstripping, thresholds, and carpet trim lines and is sold through the same Home Depot and Lowe's shelves.
• Duck Brand (ShurTech Brands): Owned by ShurTech, Duck Brand competes head-to-head with Frost King in duct tape, weather sealing tape, and DIY home repair/weatherization products, with comparable shelf placement at Walmart, Home Depot, and Amazon.
• DAP Products: Leading U.S. manufacturer of caulks, sealants, and patch products; closely comparable to Frost King's Mortite caulking cord business and adjacent to its weatherstripping line. DAP competes for the same DIY shelf and pro-channel customer.
• Tesa: German adhesive tape manufacturer with a weatherstripping and sealing tape portfolio that competes with Frost King's EPDM rubber foam and silicone weatherseal products in both retail and OEM channels.
• Gardner-Gibson: Manufacturer of roof coatings, sealants, and weatherization products distributed through home improvement retailers, overlapping with Frost King's roof cable and weatherization categories.

Broad incumbents

• Henkel (Loctite / Pattex): Global adhesives and sealants giant whose Loctite and Pattex brands sell weatherization-adjacent sealants and tapes through the same DIY retail channels; broader portfolio gives Henkel pricing and shelf leverage that Frost King lacks.
• 3M: Diversified industrial and consumer products company whose tapes, sealants, and weatherization accessories compete at the premium end of the same DIY shelves where Frost King sits, but as part of a much larger portfolio.
• Momentive Performance Materials (GE Sealants): Manufacturer of silicone sealants and weatherproofing products under the GE brand; competes with Frost King's silicone weatherseal line and other sealing categories in retail and pro channels.
• Sherwin-Williams: While primarily a paint company, Sherwin-Williams distributes paint sundries (drop cloths, strainers, brushes) that overlap with Frost King's paint sundries category and uses the same Home Depot, Lowe's, and Menards retail relationships.

Emerging players

• Intertape Polymer Group: Specialty tapes and films manufacturer with weatherization-adjacent product lines (duct, foil, and masking tapes) sold through the same home improvement and HVAC distribution channels as Frost King.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/user/Thermwell
• Facebookfacebook.com/FrostKing/?fref=ts
• Instagraminstagram.com/frostkingproducts
• Pinterestpinterest.com/frost_king

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries4 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Frost King