35
Energy usage consulting services regarding heating, ventilating and air conditioning; distributorships in the field of environmental conditioning systems and critical process systems in the nature of heating, ventilating and air conditioning
36
Providing extended warranties on environmental conditioning equipment, critical process equipment in the nature of heating, ventilating and air conditioning and related control equipment
37
Environmental conditioning and critical process systems contracting services, namely, heating, ventilating and air conditioning; installation, maintenance, repair, replacement and retrofit of environmental heating, ventilating and air conditioning apparatus, environmental heating, ventilating and air conditioning apparatus control equipment, critical process apparatus and critical process control equipment in the nature of heating, ventilating and air conditioning
40
Custom manufacture of sheet metal, ducts, piping, environmental conditioning systems and critical process systems for others in the nature of heating, ventilating and air conditioning; and chemical treatment of water; chemical treatment of water, namely, water purification
42
Mechanical engineering; custom design and engineering of environmental conditioning systems and critical process systems in the nature of heating, ventilating and air conditioning; maintenance of computer software related to environmental conditioning and critical process digital control systems