Williamson-Thermoflo manufactures gas, oil, and indirect water heaters and residential boilers. The Cincinnati, Ohio brand is a longtime fixture in residential heating and hot-water installations.

Yellow Jacket, a Ritchie Engineering brand, makes HVAC/R service tools including refrigerant manifolds, vacuum pumps, recovery machines, and charging cylinders. Its yellow gauges are an everyday tool on HVAC technician trucks.

York, a Johnson Controls brand, manufactures residential and commercial HVAC equipment including central air conditioners, heat pumps, gas furnaces, and chillers. The brand is one of the major HVAC equipment lines specified across the U.S.

Z-Flex, a Novaflex Group brand, produces flexible chimney liners, gas-vent connectors, and flexible-vent products for hearth, water heater, and high-efficiency boiler installations. Its stainless flex liners are widely used in chimney relining.