Air Conditioning Contractors of America (ACCA)

ACCA is a group of over 4,000 air conditioning contractors who work together to improve our industry, promote good practices, and keep homes and buildings safe, clean and comfortable. Read more >

The Air-Conditioning, Heating, and Refrigeration Institute (AHRI)

AHRI is the trade association representing more than 350 manufacturers of air conditioning, heating and commercial refrigeration equipment. Read more >

Air Movement and Control Association International (AMCA)

The Air Movement and Control Association International, Inc. is a not-for-profit international association of the world\\\'s manufacturers of related air system equipment for the industrial, commercial and residential markets. Read more >

Alliance to Save Energy (ASE)

The Alliance to Save Energy promotes energy efficiency worldwide to achieve a healthier economy, a cleaner environment, and greater energy security. Read more >

American Gas Association (AGA)

The American Gas Association represents companies delivering natural gas to customers to help meet their energy needs. AGA members are committed to delivering natural gas safely, reliably and cost-effectively in an environmentally responsible way. Read more >

American Indoor Air Quality Council

The American Indoor Air Quality Council promotes awareness, education and certification in the field of indoor air quality. Read more >

American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE)

ASHRAE advances technology to serve humanity and promote a sustainable world. Read more >

American Society of Mechanical Engineers (ASME)

ASME promotes the art, science & practice of mechanical & multidisciplinary engineering and allied sciences around the globe. Read more >

The Association of Energy Engineers (AEE)

The mission of AEE is to promote the scientific and educational interests of those engaged in the energy industry and to foster action for sustainable development. Read more >

Blue Hawk

BLUE HAWK members distribute a wide range of HVACR related products to the residential and commercial construction trades. Read more >

California Energy Commission

On-line look-up for certified efficiency ratings. Read more >

Commonwealth of Massachusetts, Division of Professional Licensure

On-line look-up for approved gas products in Massachusetts. Read more >

Electric Power Research Institute (EPRI)

The Electric Power Research Institute (EPRI) conducts research and development on technology, operations and the environment for the global electric power sector. Read more >

CSA International

Williams Furnace Company Certification Record. Read more >

Heating, Airconditioning & Refrigeration Distributors International (HARDI)

HARDI is a trade organization dedicated to advancing the science of wholesale distribution in the HVACR industry. Read more >

The Heating, Refrigeration and Air Conditioning Institute of Canada (HRAI)

HRAI is a partnership of industry sector organizations that represents Heating, Ventilation, Air Conditioning and Refrigeration (HVACR) manufacturers, wholesalers and contractors thoughout Canada. Read more >

Mechanical Contractors Association of America (MCCA)

The Mechanical Contractors Association of America, Inc. (MCAA) is a vibrant, growing association of approximately 2,300 mechanical, plumbing, and service contractors. Read more >

National Association of Energy Service Companies (NAESCO)

The National Association of Energy Service Companies is a national trade association which has been promoting the benefits of the widespread use of energy efficiency for over 20 years. Read more >

National Association of Home Builders (NAHB)

NAHB is a trade association that helps promote the policies that make housing a national priority. Read more >

North American Technician Excellence, Inc. (NATE)

North American Technician Excellence, Inc. (NATE) is the leading certification program for technicians in the heating, ventilation, air-conditioning, and refrigeration (HVAC/R) industry and is the only test supported by the entire industry. Read more >

UL Underwriters Laboratory

Online Certifications Directory. Read more >

Vent-Free Gas Products Alliance

The Vent-Free Gas Products Alliance is a coalition of members of the Gas Appliance Manufacturers Association\'s (GAMA\'s) Vent-Free Gas Products Division. Read more >

WIT & Co.

WIT & Co. is a pioneer in the plumbing, heating and cooling industry. Read more >