| hpac.com | HPAC Engineering |
| hardinet.org | Heating, Airconditioning and Refrigeration Distributors International |
| ansi.org | American National Standards Institute |
| achrnews.com | The Air Conditioning, Heating & Refrigeration News |
| smacna.org | Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) |
| rses.org | Refrigeration Service Engineers Society |
| mcaa.org | The Mechanical Contractors Association Of America! |
| iiar.org | International Institute of Ammonia Refrigeration |
| ghpc.org | Geothermal Heat Pump Consortium |
| gamanet.org | Gas Appliance Manufacturers Association |
Canada , Ontario , Toronto