This industry comprises establishments primarily engaged in providing steam, heated air, or cooled air. The steam distribution may be through mains. Establishments primarily engaged in--

Including:

• Air-conditioning supply
• Cooled air distribution
• Distribution of cooled air
• Distribution of heated air
• Distribution of steam heat
• Geothermal steam production
• Heat, steam, distribution
• Heated air distribution
• Heating steam (suppliers of heat) providers
• Steam heat distribution
• Steam heating systems (i.e., suppliers of heat)
• Steam production and distribution
• Steam supply systems, including geothermal