Armstrong International provides intelligent system solutions that improve utility performance, lower energy consumption, and reduce environmental emissions while providing a comfortable experience. They are innovators and globally leaders in intelligent system solutions for steam, air, and hot water.

Supplier of gas, steam or electric reactivated desiccant dehumidifiers for humidity control. Systems include outdoor air ventilation coupled with heating and cooling if required.

General Filters is a manufacturer of residential whole-house humidifiers, air cleaners, UV air purifiers, dehumidifiers, heat and energy ventilators and fuel oil filters.

Grand Traverse Refrigeration, Inc., has been providing heating, cooling, and refrigeration services to customers in the Traverse City and the surrounding areas. They are the HVACR company. They service, repair, install, maintain and design all makes and models of heating and air conditioning systems.

Heating and air conditioning equipment for residential and commercial applications, 1/2 to 25 tons, under the Comfort-Aire and Century brand names.

SANI-VAC Service provides high-quality indoor air cleaning services, including HVAC units, air ducts, and kitchen exhaust cleaning for commercial, industrial, and institutional organizations. It offer much heating and cooling cleaning services including air duct cleaning, ventilation cleaning, coil cleaning, HVAC cleaning, commercial kitchen exhaust degreasing, cooling tower cleaning, and ductwork inspections.