At Apollo, their customers are at the core of everything they do. They understand the importance of reliable heating systems in cold climates and the impact they have on the well-being of individuals and the efficiency of businesses. That's why they are dedicated to providing superior products, exceptional customer service, and continuous innovation.

Capital Coil & Air manufactures commercial and industrial OEM replacement and custom HVAC coils, heat exchangers, fan coils & belt drive air handlers. Capital Coil & Air has over a decade of experience in the commercial OEM HVAC replacement & custom design/build industry. Capital Coil & Air has extensive experience working with varied commercial clients that include: engineers, mechanical contractors, government facilities and organizations.

Chromalox is a thermal technology company. They engineer thermal solutions for the world's toughest industrial heating applications. Their Heat Trace segment delivers temperature management solutions for piping systems, valves, and tanks.

Cooney Technologies focuses on proving high-quality HVAC solutions through innovative technologies, industry expertise, and superior support.

In 2022, the Professional Plumbing Group (PPG) joined the Marcone Group. PPG and its affiliated companies – which have a history stretching back 150 years – design, manufacture, market and distribute high-quality plumbing products and solutions.

Established in 1914, MSA Safety Incorporated is the global pioneer in the development, manufacture, and supply of safety products that protect people and facility infrastructures. Many MSA products integrate a combination of electronics, mechanical systems, and advanced materials to protect users against hazardous or life-threatening situations.

PTubes, Inc. is the US subsidiary of Feinroren S.p.A. - Italy. They are a renowned manufacturer of copper refrigeration coils, pipe and pre-insulated copper coils for the HVAC industry.

Sonobond Ultrasonics are manufacturers of ultrasonic welding equipment used for assembly of metals, filters, plastics and wire harnesses, and the sealing of copper tubing.