Establishments primarily engaged in manufacturing temperature and related controls for heating and air-conditioning installations and refrigeration applications, which are electrically, electronically, or pneumatically actuated, and which measure and control variables such as temperature and humidity; and automatic regulators used as components of household appliances. Establishments primarily engaged in manufacturing industrial process controls are classified in Industry 3823; those manufacturing motor control switches are classified in Industry 3625; those manufacturing switches for household appliances are classified in Industry 3643; and those manufacturing appliance timers are classified in Industry 3873.

• Air flow controllers, air-conditioning and refrigeration except valves
• Appliance regulators, except switches
• Building services monitoring controls, automatic
• Clothes dryer controls including dryness controls
• Combination limit and fan controls
• Combination oil and hydronic controls
• Damper operators pneumatic, thermostatic, and electric
• Electric air cleaner controls, automatic
• Electric heat proportioning controls, modulating controls
• Electric space heater controls, automatic
• Energy cutoff controls, residential and commercial types
• Fan control, temperature responsive
• Flame safety controls for furnaces and boilers
• Float controls, residential and commercial types
• Gas burner automatic controls, except valves
• Gradual switches, pneumatic
• Humidistats wall, duct, and skeleton
• Humidity controls, air conditioning types
• Hydronic circulator control, automatic
• Hydronic limit control
• Hydronic pressure and temperature controls
• Ice bunk controls
• Ice maker controls
• Ignition controls for gas appliances and furnaces, automatic
• In-built thermostats, filled system and bimetal types
• Incinerator control systems, residential and commercial types
• Limit controls, residential and commercial heating types
• Line or limit control for electric heat
• Liquid level controls, residential and commercial heating types
• Oven temperature controls, nonindustrial
• Pneumatic relays, air-conditioning type
• Pressure controllers, air-conditioning system type
• Primary oil burner controls, including stack controls and cadmium
• Refrigeration controls, pressure
• Refrigeration thermostats
• Refrigeration/air-conditioning defrost controls
• Sequencing controls for electric heat
• Static pressure regulators
• Steam pressure controls, residential and commercial type
• Surface burner controls, temperature
• Switches pneumatic positioning remote
• Switches, thermostatic
• Temperature controls, automatic: residential and commercial types
• Temperature sensors for motor windings
• Thermocouples, vacuum: glass
• Thermostats: air-conditioning, refrigeration, comfort heating,
• Time program controls, air-conditioning systems
• Vapor heating controls
• Water heater controls