Headquartered in Ashland City, A. O. Smith is a leading manufacturer and marketer of residential and commercial water heaters and hydronic boilers. A. O. Smith’s selection of residential and commercial water heaters, boilers, and storage tanks is unmatched for quality and diversity. A. O. Smith can provide an energy-efficient solution with maximum value during and for years after installation.

American Residential Services (ARS) is a brand of American Residential Services LLC., which provides heating, air conditioning, indoor air quality, plumbing, drain cleaning and sewer line services from company-owned locations across the United States of America (USA). United by exceptional service, the ARS® / Rescue Rooter® Network serves both residential and light commercial customers.

American Water Heaters is a globally renowned manufacturer and installer of high-quality water heater products. Their manufacturing, research and development and corporate offices are located in Johnson City, Tennessee. American Water Heaters offers a comprehensive line of residential and commercial water heaters.

Duct heating products for commercial and residential HVAC equipment that include custom electric duct heaters, load banks, OEM, replacement elements, and parts.

HeatLink Group Inc. is a multi-system supplier of potable water and radiant hydronic heating/cooling and snow melt systems. For over 20 years they have created comfortable and efficient heating, cooling and plumbing systems for residential and commercial construction. HeatLink’s radiant heating systems create a comfortable and energy efficient environment for living.

Markel Products is a renowned provider of commercial, industrial, residential electric heating equipment, industrial ventilation, controls, industrial lighting, portable air conditioning and portable evaporative cooling solutions.

TPI Corporation is known as America's Comfort Conditioning Company. They provide ventilation equipment; electric infrared portable and mounted heaters, fan-forced electric heaters, explosion-proof heaters, unit and cabinet unit heaters; portable and mounted task lights, thermostat and control equipment and many more.

Tutco is a custom manufacturer of electric heating elements and units. They supply electric resistance heating elements for a broad range of industrial, commercial, and residential applications.