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 | Incinerator control systems, residential and commercial types |
| Appliance regulators, except switches | Limit controls, residential and commercial heating types |
| Building services monitoring controls, automatic | Line or limit control for electric heat |
| Clothes dryer controls including dryness controls | Liquid level controls, residential and commercial heating types |
| Combination limit and fan controls | Oven temperature controls, nonindustrial |
| Combination oil and hydronic controls | Pneumatic relays, air-conditioning type |
| Damper operators pneumatic, thermostatic, and electric | Pressure controllers, air-conditioning system type |
| Electric air cleaner controls, automatic | Primary oil burner controls, including stack controls and cadmium |
| Electric heat proportioning controls, modulating controls | Refrigeration controls, pressure |
| Electric space heater controls, automatic | Refrigeration thermostats |
| Energy cutoff controls, residential and commercial types | Refrigeration/air-conditioning defrost controls |
| Fan control, temperature responsive | Sequencing controls for electric heat |
| Flame safety controls for furnaces and boilers | Static pressure regulators |
| Float controls, residential and commercial types | Steam pressure controls, residential and commercial type |
| Gas burner automatic controls, except valves | Surface burner controls, temperature |
| Gradual switches, pneumatic | Switches pneumatic positioning remote |
| Humidistats wall, duct, and skeleton | Switches, thermostatic |
| Humidity controls, air conditioning types | Temperature controls, automatic: residential and commercial types |
| Hydronic circulator control, automatic | Temperature sensors for motor windings |
| Hydronic limit control | Thermocouples, vacuum: glass |
| Hydronic pressure and temperature controls | Thermostats: air-conditioning, refrigeration, comfort heating, appliance |
| Ice bunk controls | Time program controls, air-conditioning systems |
| Ice maker controls | Vapor heating controls |
| Ignition controls for gas appliances and furnaces, automatic | Water heater controls |
| In-built thermostats, filled system and bimetal types | |
| Codes |
Titles | Total Marketable US Businesses |
| 38220000 | Environmental controls | 438 |
| 38220100 | Air conditioning and refrigeration controls | 150 |
| 38220101 | Air flow controllers, air conditioning and refrigeration | 54 |
| 38220102 | Fan control, temperature responsive | 2 |
| 38220103 | Humidity controls, air-conditioning types | 10 |
| 38220104 | Pressure controllers, air-conditioning system type | 9 |
| 38220105 | Refrigeration controls (pressure) | 8 |
| 38220106 | Refrigeration/air-conditioning defrost controls | 14 |
| 38220107 | Time program controls, air-conditioning systems | 2 |
| 38220200 | Hardware for environmental regulators | 18 |
| 38220201 | Damper operators: pneumatic, thermostatic, electric | 15 |
| 38220202 | Gradual switches, pneumatic | 0 |
| 38220203 | Pneumatic relays, air-conditioning type | 2 |
| 38220204 | Switches, pneumatic positioning remote | 3 |
| 38220205 | Switches, thermostatic | 5 |
| 38220206 | Temperature controls, automatic | 94 |
| 38220300 | Thermostats and other environmental sensors | 47 |
| 38220301 | Built-in thermostats, filled system and bimetal types | 3 |
| 38220302 | Humidistats: wall, duct, and skeleton | 2 |
| 38220304 | Temperature sensors for motor windings | 4 |
| 38220305 | Thermocouples, vacuum: glass | 3 |
| 38220306 | Thermostats, except built-in | 10 |
| 38220400 | Hydronic controls | 11 |
| 38220401 | Hydronic circulator control, automatic | 5 |
| 38220402 | Hydronic limit control | 0 |
| 38220403 | Hydronic pressure or temperature controls | 8 |
| 38220404 | Liquid level controls, residential or commercial heating | 8 |
| 38220500 | Electric heat controls | 7 |
| 38220501 | Electric heat proportioning controls, modulating controls | 8 |
| 38220502 | Line control for electric heat | 0 |
| 38220600 | Appliance controls,except air-conditioning and refrigeration | 8 |
| 38220601 | Appliance regulators | 15 |
| 38220602 | Clothes dryer controls | 1 |
| 38220604 | Ignition controls for gas appliances and furnaces, automatic | 5 |
| 38220605 | Oven temperature controls, non-industrial type | 2 |
| 38220606 | Surface burner controls, temperature | 1 |
| 38229901 | Building services monitoring controls, automatic | 120 |
| 38229902 | Controls, combination limit and fan | 3 |
| 38229903 | Controls, combination oil and hydronic | 5 |
| 38229904 | Electric air cleaner controls, automatic | 10 |
| 38229905 | Energy cutoff controls, residential or commercial types | 30 |
| 38229906 | Flame safety controls for furnaces and boilers | 4 |
| 38229907 | Float controls, residential or commercial types | 1 |
| 38229908 | Gas burner, automatic controls | 2 |
| 38229909 | Ice bank controls | 2 |
| 38229910 | Ice maker controls | 3 |
| 38229911 | Incinerator control systems, residential and commercial type | 5 |
| 38229912 | Limit controls, residential and commercial heating types | 4 |
| 38229914 | Static pressure regulators | 2 |
| 38229915 | Steam pressure controls, residential or commercial type | 10 |
| 38229916 | Vapor heating controls | 11 |
| 38229917 | Water heater controls | 12 |
