Collection: Indoor Air Quality (IAQ) and Combo Sensors
Indoor Air Quality (IAQ) directly impacts occupant health and productivity in commercial buildings. Poor ventilation and pollutants such as mold, VOCs, CO₂, and particulate matter can cause headaches, fatigue, and reduced performance — while well-managed air quality improves comfort and well-being. IAQ and combo sensors monitor these conditions and signal HVAC systems to automatically adjust for cleaner air. Combo sensors measure multiple parameters in a single device, with many models combining temperature and relative humidity, and others adding CO₂, CO, NO₂, or particulate matter monitoring. We carry IAQ and combo sensors from Senva, Gentex, Siemens, Greystone, and other trusted manufacturers.
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Greystone NTRCLRHP (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Setpoint Adjustment, 2 button up/down
Regular price $231.76 USDRegular priceSale price $231.76 USD -
Greystone NTRCLRHFS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Momentary Override Switch - N.O.
Regular price $244.81 USDRegular priceSale price $244.81 USD -
Greystone NTRCLRHFRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Relay Output, Momentary Override Switch - N.O.
Regular price $260.44 USDRegular priceSale price $260.44 USD -
Greystone NTRCLRHFR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Relay Output
Regular price $255.23 USDRegular priceSale price $255.23 USD -
Greystone NTRCLRHFPS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Momentary Override Switch - N.O.
Regular price $250.04 USDRegular priceSale price $250.04 USD -
Greystone NTRCLRHFPRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Relay Output, Momentary Override Switch - N.O.
Regular price $265.70 USDRegular priceSale price $265.70 USD -
Greystone NTRCLRHFPR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Relay Output
Regular price $260.44 USDRegular priceSale price $260.44 USD -
Greystone NTRCLRHFP (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down
Regular price $244.81 USDRegular priceSale price $244.81 USD -
Greystone NTRCLRHF (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Fanspeed Switch, 5 Position
Regular price $239.61 USDRegular priceSale price $239.61 USD -
Greystone NTRCLRHDS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Momentary Override Switch - N.O.
Regular price $247.42 USDRegular priceSale price $247.42 USD -
Greystone NTRCLRHDRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Relay Output, Momentary Override Switch - N.O.
Regular price $263.05 USDRegular priceSale price $263.05 USD -
Greystone NTRCLRHDR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Relay Output
Regular price $257.85 USDRegular priceSale price $257.85 USD -
Greystone NTRCLRHDPS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Setpoint Adjustment, 2 button up/down, Momentary Override Switch - N.O.
Regular price $252.62 USDRegular priceSale price $252.62 USD -
Greystone NTRCLRHDPRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Setpoint Adjustment, 2 button up/down, Relay Output, Momentary Override Switch - N.O.
Regular price $268.29 USDRegular priceSale price $268.29 USD -
Greystone NTRCLRHDPR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Setpoint Adjustment, 2 button up/down, Relay Output
Regular price $263.05 USDRegular priceSale price $263.05 USD -
Greystone NTRCLRHDP (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Setpoint Adjustment, 2 button up/down
Regular price $247.42 USDRegular priceSale price $247.42 USD -
Greystone NTRCLRHDFS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Momentary Override Switch - N.O.
Regular price $260.44 USDRegular priceSale price $260.44 USD -
Greystone NTRCLRHDFRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Relay Output, Momentary Override Switch - N.O.
Regular price $276.10 USDRegular priceSale price $276.10 USD -
Greystone NTRCLRHDFR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Relay Output
Regular price $270.87 USDRegular priceSale price $270.87 USD -
Greystone NTRCLRHDFPS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Momentary Override Switch - N.O.
Regular price $265.70 USDRegular priceSale price $265.70 USD -
Greystone NTRCLRHDFPRS (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Relay Output, Momentary Override Switch - N.O.
Regular price $281.30 USDRegular priceSale price $281.30 USD -
Greystone NTRCLRHDFPR (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down, Relay Output
Regular price $276.10 USDRegular priceSale price $276.10 USD -
Greystone NTRCLRHDFP (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position, Setpoint Adjustment, 2 button up/down
Regular price $260.44 USDRegular priceSale price $260.44 USD -
Greystone NTRCLRHDF (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input, Fanspeed Switch, 5 Position
Regular price $255.23 USDRegular priceSale price $255.23 USD -
Greystone NTRCLRHD (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity, Digital Input
Regular price $242.19 USDRegular priceSale price $242.19 USD -
Greystone NTRCLRH (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Viewable, Temperature & Humidity
Regular price $226.57 USDRegular priceSale price $226.57 USD -
Greystone NTRCNT (NTRC Series) Network Sensor w/ BACnet or Modbus Communications, Concealed, Temperature Only
Regular price $130.22 USDRegular priceSale price $130.22 USD -
Greystone CERMC59 Room Carbon Dioxide Sensor, 0-2000 ppm, 10,000 Ohm NTC Thermistor, ±0.2 C
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC24 Room Carbon Dioxide Sensor, 0-2000 ppm, 10,000 Ohm, type 2, NTC Thermistor, ±0.2 CType 59 - 10,000 ohm NTC Thermistor ±0.2°C
Regular price $200.51 USDRegular priceSale price $200.51 USD -
Greystone CERMC20 Room Carbon Dioxide Sensor, 0-2000 ppm, 20,000 Ohm, NTC Thermistor, ±0.2 CType 24 - 10,000 ohm Type 2 NTC Thermistor ±0.2°C
Regular price $200.51 USDRegular priceSale price $200.51 USD -
Greystone CERMC14 Room Carbon Dioxide Sensor, 0-2000 ppm, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 C c/w 11K shunt resistorType 20 - 20,000 ohm NTC Thermistor ±0.2°C
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC13 Room Carbon Dioxide Sensor, 0-2000 ppm, 1000 Ohm Nickel, Class B, DIN 43760Type 14 - 10,000 ohm Thermistor ±0.2°C c/w 11K Shunt Resistor
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC12 Room Carbon Dioxide Sensor, 0-2000 ppm, 1000 Ohm Platinum, IEC 751, 385 Alpha, thin filmType 13 - 1000 ohm Nickel RTD ±0.3°C
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC08 Room Carbon Dioxide Sensor, 0-2000 ppm, 2.252K Ohm, NTC Thermistor, ±0.2 CType 12 - Pt1000 - 1000 ohm Platinum RTD ±0.3°C
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC07 Room Carbon Dioxide Sensor, 0-2000 ppm, 10,000 Ohm, type 3, NTC Thermistor, ±0.2 CType 8 - 2.252K ohm NTC Thermistor ±0.2°C
Regular price $200.51 USDRegular priceSale price $200.51 USD -
Greystone CERMC06 Room Carbon Dioxide Sensor, 0-2000 ppm, 3000 Ohm, NTC Thermistor, ±0.2 CType 7 - 10,000 ohm Type 3 NTC Thermistor ±0.2°C
Regular price $200.51 USDRegular priceSale price $200.51 USD -
Greystone CERMC05 Room Carbon Dioxide Sensor, 0-2000 ppm, 1801 Ohm, NTC Thermistor, ±0.2 CType 6 - 3000 ohm NTC Thermistor ±0.2°C
Regular price $200.51 USDRegular priceSale price $200.51 USD -
Greystone CERMC02 Room Carbon Dioxide Sensor, 0-2000 ppm, 100 Ohm Plat. IEC 751, 385 Alpha, thin filmType 5 - 1800 ohm NTC Thermistor ±0.2°C
Regular price $204.80 USDRegular priceSale price $204.80 USD -
Greystone CERMC00 Room Carbon Dioxide Sensor, 0-2000 ppm, No temperature sensorType 2 - Pt100 - 100 ohm Platinum RTD ±0.3°C
Regular price $192.12 USDRegular priceSale price $192.12 USD -
Greystone HTRC5NVS Room Humidity/ Temperature Transmitter, 5%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable, Override switch (Includes OCC input)
Regular price $188.80 USDRegular priceSale price $188.80 USD -
Greystone HTRC5NV Room Humidity/ Temperature Transmitter, 5%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable
Regular price $183.57 USDRegular priceSale price $183.57 USD -
Greystone HTRC5NIS Room Humidity/ Temperature Transmitter, 5%, Concealed LCD, 4-20 mA output, Override switch (Includes OCC input)
Regular price $188.80 USDRegular priceSale price $188.80 USD -
Greystone HTRC5NI Room Humidity/ Temperature Transmitter, 5%, Concealed LCD, 4-20 mA output
Regular price $183.57 USDRegular priceSale price $183.57 USD -
Greystone HTRC5LVS Room Humidity/ Temperature Transmitter, 5%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable, Override switch (Includes OCC input)
Regular price $215.04 USDRegular priceSale price $215.04 USD -
Greystone HTRC5LV Room Humidity/ Temperature Transmitter, 5%, Viewable LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable
Regular price $209.81 USDRegular priceSale price $209.81 USD -
Greystone HTRC5LIS Room Humidity/ Temperature Transmitter, 5%, Viewable LCD, 4-20 mA output, Override switch (Includes OCC input)
Regular price $215.04 USDRegular priceSale price $215.04 USD -
Greystone HTRC5LI Room Humidity/ Temperature Transmitter, 5%, Viewable LCD, 4-20 mA output
Regular price $209.81 USDRegular priceSale price $209.81 USD -
Greystone HTRC3NVS Room Humidity/ Temperature Transmitter, 3%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable, Override switch (Includes OCC input)
Regular price $241.28 USDRegular priceSale price $241.28 USD -
Greystone HTRC3NV Room Humidity/ Temperature Transmitter, 3%, Concealed LCD, 0-5 Vdc or 0-10 Vdc output - Menu-selectable
Regular price $236.04 USDRegular priceSale price $236.04 USD -
Greystone HTRC3NIS Room Humidity/ Temperature Transmitter, 3%, Concealed LCD, 4-20 mA output, Override switch (Includes OCC input)
Regular price $241.28 USDRegular priceSale price $241.28 USD