The Heat Exchange Institute (HEI) is a non-profit trade association committed to the technical advancement, promotion, and understanding of a broad range of utility and industrial-scale heat exchange and vacuum apparatus. The primary purpose of HEI is to develop and publish standards which advance the technology, increase the efficiency, and promote the use of heat exchange and vacuum apparatus.

Heat Transfer Products Group, LLC (HTPG) manufactures energy-efficient refrigeration equipment (evaporators, condensing units, condensers, air handlers, coils and packaged systems) sold under the brands of Russell, Witt, Kramer and ColdZone. They are wholesalers and sales representatives too.

Heatcraft Refrigeration Products is a globally renowned company in commercial refrigeration, providing climate-control solutions to customers in more than 70 countries. They manufacture and service unit coolers, air-cooled condensers, condensing units, low-temperature, hot gas and electric defrost equipment, refrigeration systems, heat transfer systems, custom refrigeration rack systems, and refrigeration system controls.

Heating and Air Conditioning Supply, Inc. is a proud local distributor of Armstrong Air and Ducane HVAC equipment. Since Heating and Air Conditioning Supply, Inc.'s debut in 2003, they have experienced enormous growth due to experienced staff with excellent product knowledge, quality materials at the lowest prices available and an extreme focus on customer service.

Herrera Heating and Air Conditioning Inc are more than just an HVAC company in Westminster – they’re partners in creating comfortable and efficient living and working environments. And as a trusted family-owned HVAC contracting company with over 30 years of experience, they pride themselves on delivering comprehensive services for both residential and commercial properties in Westminster and the entire Metro Denver area.

Highside Chemicals, Inc. has manufactured the highest quality chemical products for the maintenance, installation and repair of refrigeration, air conditioning and plumbing systems for over eighty-five years. All products are thoroughly tested and proven to perform to the highest standards. Their commitment to quality along with excellent customer service and technical support makes Highside Chemicals the best choice.

Hoffmann Brothers' contractors have provided reliable professional services to local communities like Nashville for over 40 years. Their experienced HVAC technicians can help with all of heating and cooling needs, including HVAC installation, repair, and maintenance services. Their team of expert plumbers are available for a variety of services including drain cleaning and inspections, water heater installation and maintenance.

For nearly 20 years, Holtzople Heating and Air Conditioning has been a leading HVAC company serving central Maryland and southern Pennsylvania, featuring star brands such as Trane, Lennox, Carrier, Bryant, ClimateMaster and more. Holtzople provides complete installation, repair and preventive maintenance agreements for residential heat pumps and air conditioners, as well as oil and gas furnaces and boilers.

For nearly 20 years, Holtzople Heating and Air Conditioning has been a leading HVAC company serving central Maryland and southern Pennsylvania, featuring star brands such as Trane, Lennox, Carrier, Bryant, ClimateMaster and more. Holtzople provides complete installation, repair and preventive maintenance agreements for residential heat pumps and air conditioners, as well as oil and gas furnaces and boilers.

The Home Ventilating Institute (HVI), is a nonprofit association of manufacturers of residential ventilation products. HVI provides creditable product performance ratings including airflow, sound and energy.

Hometown Comfort Pros HVAC Dealer and Installer is located in Lynchburg Virginia offers Heat Pump Repair, Heat Pump Installs and Maintenance. We serve heating and air conditioning in Forest Virginia, Bedford Virginia, Evington Virginia, Madison Heights Virginia, Amherst Virginia, Smith Mountain Lake Virginia.

Hometree exists to help homeowners keep their homes warm, safe & working by providing HVAC solutions.

Since 1962, Houk has been keeping Texans cool by providing award-winning service and the most modern, up-to-date technology in HVAC equipment. When it comes to maximum comfort, Houk is a pioneer that backs all work with a customer satisfaction guarantee.

At Howell's Heating & Air believe in providing the greatest value possible by offering first class service as well as uncompromising quality at a reasonable price. Over 40 years and a generation later, Howell’s remains true to this original philosophy and attributes its success and reputation to their great owners, for their hard work every single day.

Hugh M. Cunningham Companies offers premier sales representation to all distribution sectors of the HVAC and Refrigeration markets in the US States of Texas, Louisiana, New Mexico, Oklahoma and Arkansas.

Hunt’s Services is a heating, air conditioning, electrical and plumbing service company, which has established a reputation for quality work and dependability.

HVAC Erie specialize in air duct cleaning, air conditioning repair, and furnace repair in Erie, Pennsylvania, USA. They offer a full range of heating and cooling services, including furnace repair, air conditioning repair, and air duct cleaning. Their experienced technicians are available 24/7 for emergency repairs.

HVAC Philly is a full service Heating & Air Conditioning company proudly serving residences and businesses in the Philadelphia, Bucks and Montgomery county area since 1994. HVAC Philly offers same day and 24-hour emergency service, as a greater Philadelphia licensed HVAC contractor, they install and service air conditioning and heating systems.

Manufacturers of Fin Tube Coils, Evaporator, Condenser, Heater in Aluminum and Copper Tubes of 5&7mm, 5/16", 3/8" dia with warehouse in Virginia, USA

Industrial Maid is the premier manufacturer of air purification systems to fit virtually any industrial application or budget. They are an air filtration manufacturer with unmatched customer services, disruptive technology, and a philosophy of continuous improvement. Their unique equipment offerings incorporate environmentally sound components and keep purchase, installation, and operation simple.

Inland Empire Comfort Air Conditioning and Heating believe in supporting their local Riverside community members. They make relationships with their clients, making sure they are getting all of their needs taken care of. Their clients can vouch for the personal one-on-one service they receive, which is both comforting and helpful during a home repair.

International Facility Management Association (IFMA) is the world's largest and most widely recognized international association for facility management professionals, supporting over 23,000 members in more than 10​0 countries.

ITI supports apprenticeship and advanced career training for union workers in the sheet metal industry throughout the United States and Canada. Located in Fairfax, Virginia, the ITI produces a standardized curriculum supported by a wide variety of training materials free of charge to apprentices and journey-level workers who work in the following specialized disciplines: Architectural Sheet Metal, Building Information Modeling,& HVAC Service.

Since 1919, Intertherm has been an integral part of improving the comfort of manufactured homes. They are the only heating and cooling manufacturer to be certified in Demand Flow Technology.

Industrial distributors focus on product knowledge and expertise while bringing the customer a massive line of name-brand, quality products.

ISC Sales Inc. provides superior industrial products to a wide variety of end-users and original equipment manufacturers (OEM). They offer a broad range of climate control products for electrical enclosures, such as air conditioners, vortex coolers, air to air heat exchangers, purge & pressurization units, filtered fans, and thermoelectric coolers.

J & J Air Conditioning provides comprehensive HVAC services to commercial and industrial clients. They utilize evolving technology to find new and innovative ways to serve their customers.

J.R.V Heating & Cooling LLC. believe that nothing is more important than comfort. Their technicians are here to attend to client's needs 24 hours a day. They offer a variety of maintenance service designed to address unique needs with their rates are among the most competitive in the industry.

Jackson Systems is an HVAC controls distributor for the residential and light commercial markets. The company specializes in zoning, thermostats, and home automation products.

At Jade Air, their priority is serving air conditioning and heating (HVAC) needs including a/c repair, troubleshooting and maintenance. Since 1991, they have been providing quality and reliable HVAC service to the Dallas area, in Texas, USA.