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Almost every heating, ventilation, air-conditioning, and refrigeration system uses sensors. Choose the world's top sensor brands to optimize system performance, and ensure occupant health, safety, comfort, and productivity.

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Aaon Sensors AERCO Boiler and Water Heater Sensors AJ Antunes Sensors Armstrong Furnace Sensors Image for Armstrong International Armstrong International Sensors Bacharach Sensors Baltimore Parts Sensors Image for BAPI BAPI Sensors Barber Colman Sensors Bard HVAC Sensors Image for Belimo Belimo Sensors Bell Gossett Sensors Bosch Sensors Bradford White Sensors Broan Fans Sensors BROAN-NuTone Sensors Buderus Sensors Burnham Boilers Sensors Carlin Sensors Carlyle Sensors Carrier Sensors Chicago Faucet Co Sensors ClimateMaster Sensors Copeland Sensors Danfoss Sensors DriSteem Sensors Eclipse Sensors EWC Controls Sensors Fenwal Sensors Fireye Sensors GE Sensing-General Eastern Sensors Greenheck Sensors Grundfos Sensors Grundfos Circulators Sensors Haier A/C Sensors Heat Transfer Prod Sensors Heatcraft Refrigeration Sensors Honeywell Sensors Honeywell E-MON Meters Sensors Honeywell Home Sensors Honeywell Inc Sensors Hydrolevel/Safeguard Sensors ICM Controls Sensors Indeeco Sensors Intellihot Sensors International Comfort Products Sensors J/B Industries SAE Fittings Sensors Johnson Controls Sensors Kele Product Sensors Laars Sensors Leak Detector Sensors Maxitrol Sensors Mcdonnell Miller Sensors Micronet Sensors Modine Sensors Moen Sensors Image for Navien Boilers & Water Heaters Navien Boilers & Water Heaters Sensors Oil Equipment Manufacturing Sensors Panasonic Sensors Pro1Iaq Sensors R.W. Beckett Sensors Raypak Sensors Resideo Sensors Reznor Sensors Rinnai Sensors Sterling Sensors Thermo Pride Furnaces Sensors Water Heater Parts Sensors Weil Mclain Sensors York Sensors

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HVAC Humidity Sensor for Sale
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View Details HONEYWELL RESIDENTIAL THX321WFS3001W 24V T10+ WT WIFI Thermostat W/Remote Sensor 2H/2C Conventional 3H/2C Heat Pump Replaces THX321WFS2001W | Midwest Supply Us
THX321WFS3001W | 24V T10+ WT WIFI Thermostat W/Remote Sensor 2H/2C Conventional 3H/2C Heat Pump Replaces THX321WFS2001W | HONEYWELL RESIDENTIAL
Brand: HONEYWELL RESIDENTIAL
SKU: THX321WFS3001W
$307.97 each
View Details RESIDEO WLD3CABLE Sensor Cable for Lyric Water Leak Detector | Midwest Supply Us
WLD3CABLE | Sensor Cable for Lyric Water Leak Detector | RESIDEO
Brand: RESIDEO
SKU: WLD3CABLE
$23.71 each
View Details Resideo 50001464-004 Mounted Sensor 36" | Midwest Supply Us
50001464-004 | Mounted Sensor 36" | Resideo
Brand: Resideo
SKU: 50001464-004
$68.05 each
View Details HONEYWELL RESIDENTIAL R8182H1070 Triple Aquastat Relay Intermittent Ign. 45 Sec. Ss Includes 5ft (1.5 m) armored Capillary with remote sensor | Midwest Supply Us
R8182H1070 | Triple Aquastat Relay Intermittent Ign. 45 Sec. Ss Includes 5ft (1.5 m) armored Capillary with remote sensor | HONEYWELL RESIDENTIAL
Brand: HONEYWELL RESIDENTIAL
SKU: R8182H1070
$1,173.76 each
View Details Resideo TH115-AF-12VDC 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AMBIENT OR FLOOR CONTROL. 12VDC, MUST BE USED WITH CT230 LINKED UNITS. BACKLIT SCRE EN | Midwest Supply Us
TH115-AF-12VDC | 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AMBIENT OR FLOOR CONTROL. 12VDC, MUST BE USED WITH CT230 LINKED UNITS. BACKLIT SCRE EN | Resideo
Brand: Resideo
SKU: TH115-AF-12VDC
View Details
View Details Resideo TH115-AF-120S LOW VOLT 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AM BIENT OR FLOOR CONTROL. 16.7A 120V SP, BACKLIT SCREEN | Midwest Supply Us
TH115-AF-120S | LOW VOLT 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AM BIENT OR FLOOR CONTROL. 16.7A 120V SP, BACKLIT SCREEN | Resideo
Brand: Resideo
SKU: TH115-AF-120S
$127.07 each
View Details Resideo TH115-AF-024T LOW VOLT 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AM BIENT OR FLOOR CONTROL. 0.5A , 24V, R,C,W. 15 MIN. CYCLES, BACKLIT SCREE N | Midwest Supply Us
TH115-AF-024T | LOW VOLT 7-DAY PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AM BIENT OR FLOOR CONTROL. 0.5A , 24V, R, C, W. 15 MIN. CYCLES, BACKLIT SCREE N | Resideo
Brand: Resideo
SKU: TH115-AF-024T
$143.49 each
View Details Resideo W8735Y1000 WIRELESS SENSOR FOR OUTDOOR TEMPERATURE | Midwest Supply Us
W8735Y1000 | WIRELESS SENSOR FOR OUTDOOR TEMPERATURE | Resideo
Brand: Resideo
SKU: W8735Y1000
$322.12 each
View Details Resideo Q3400A1016 HOT SURFACE PILOT IGNITER/SENSOR ASSY. REPLACEMENT FOR SMARTVALVE PILOTS, 24" LEADS. | Midwest Supply Us
Q3400A1016 | HOT SURFACE PILOT IGNITER/SENSOR ASSY. REPLACEMENT FOR SMARTVALVE PILOTS, 24" LEADS. | Resideo
Brand: Resideo
SKU: Q3400A1016
$96.48 each
View Details Resideo 32004955-003 ELECTRONIC SENSOR. INTENDED FOR L7148. 24" LEAD LENGTH 18AWG, ONE 3/16" ,ONE 1/4" QUICK CONNECT. INCLUDES CAPTIVE RETAINING CLIP ON SENSOR. | Midwest Supply Us
32004955-003 | ELECTRONIC SENSOR. INTENDED FOR L7148. 24" LEAD LENGTH 18AWG, ONE 3/16" , ONE 1/4" QUICK CONNECT. INCLUDES CAPTIVE RETAINING CLIP ON SENSOR. | Resideo
Brand: Resideo
SKU: 32004955-003
$77.25 each
View Details Resideo YTHX9421R7001WW PRESTIGE IAQ THERMOSTAT, EIM, OAS, RIG, AND DUCT SENSORS | Midwest Supply Us
YTHX9421R7001WW | PRESTIGE IAQ THERMOSTAT, EIM, OAS, RIG, AND DUCT SENSORS | Resideo
Brand: Resideo
SKU: YTHX9421R7001WW
$567.60 each
View Details Resideo THX321WF2003W T10 RNC NO SENSORS | Midwest Supply Us
THX321WF2003W | T10 RNC NO SENSORS | Resideo
Brand: Resideo
SKU: THX321WF2003W
View Details
View Details Resideo Q3400A1032 HOT SURFACE PILOT IGNITER/SENSOR ASSY. REPLACEMENT FOR SMARTVALVE PILOTS, 30" LEADS. | Midwest Supply Us
Q3400A1032 | HOT SURFACE PILOT IGNITER/SENSOR ASSY. REPLACEMENT FOR SMARTVALVE PILOTS, 30" LEADS. | Resideo
Brand: Resideo
SKU: Q3400A1032
$117.76 each
View Details Resideo C7835A1009 ENVIRACOM DISCHARGE AIR TEMPERATURE SENSOR FOR W8835 AND W8635 | Midwest Supply Us
C7835A1009 | ENVIRACOM DISCHARGE AIR TEMPERATURE SENSOR FOR W8835 AND W8635 | Resideo
Brand: Resideo
SKU: C7835A1009
$118.29 each
View Details Resideo YTH6320R1001 WIRELESS FOCUSPRO KIT. A Y-PACK CONTAINING A WIRELESS FOCUSPRO 5-1-1 PROGRAMMABLE THERMOSTAT, EQUIPMENT INTERFACE MODULE AND RETURN AIR SENSOR. | Midwest Supply Us
YTH6320R1001 | WIRELESS FOCUSPRO KIT. A Y-PACK CONTAINING A WIRELESS FOCUSPRO 5-1-1 PROGRAMMABLE THERMOSTAT, EQUIPMENT INTERFACE MODULE AND RETURN AIR SENSOR. | Resideo
Brand: Resideo
SKU: YTH6320R1001
$376.45 each
View Details HONEYWELL RESIDENTIAL HZ221K TRUEZONE KIT INCLUDES HZ221 ZONE PANEL, DISCHARGE AIR TEMPERATURE SENSOR, AND TRANSFORMER | Midwest Supply Us
HZ221K | TRUEZONE KIT INCLUDES HZ221 ZONE PANEL, DISCHARGE AIR TEMPERATURE SENSOR, AND TRANSFORMER | HONEYWELL RESIDENTIAL
Brand: HONEYWELL RESIDENTIAL
SKU: HZ221K
$246.17 each
View Details Resideo YTHM5421R1010 EQUIPMENT INTERFACE MODULE KIT WITH 2 DUCT SENSORS. CONTROLS UP TO 4- ST AGES OF HEAT AND 2-STAGES OF COOL IN A HEAT PUMP SYSTEM AND UP TO 3- STA GES OF HEAT AND 2-STAGES OF COOL IN A CONVENTIONAL SYSTEM | Midwest Supply Us
YTHM5421R1010 | EQUIPMENT INTERFACE MODULE KIT WITH 2 DUCT SENSORS. CONTROLS UP TO 4- ST AGES OF HEAT AND 2-STAGES OF COOL IN A HEAT PUMP SYSTEM AND UP TO 3- STA GES OF HEAT AND 2-STAGES OF COOL IN A CONVENTIONAL SYSTEM | Resideo
Brand: Resideo
SKU: YTHM5421R1010
$122.92 each
View Details Resideo YTH5320R1000 WIRELESS FOCUSPRO KIT. A Y-PACK CONTAINING A WIRELESS FOCUSPRO 5-1-1 PR OGRAMMABLE THERMOSTAT, EQUIPMENT INTERFACE MODULE AND RETURN AIR SENSOR. | Midwest Supply Us
YTH5320R1000 | WIRELESS FOCUSPRO KIT. A Y-PACK CONTAINING A WIRELESS FOCUSPRO 5-1-1 PR OGRAMMABLE THERMOSTAT, EQUIPMENT INTERFACE MODULE AND RETURN AIR SENSOR. | Resideo
Brand: Resideo
SKU: YTH5320R1000
$359.96 each
View Details Resideo TH114-AF-024T LOW VOLT NON-PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AMBI ENT OR FLOOR CONTROL. 0.5A , 24V, R,C,W. 15 MIN. CYCLES, BACKLIT SCREEN | Midwest Supply Us
TH114-AF-024T | LOW VOLT NON-PROGRAMMABLE THERMOSTAT WITH FLOOR TEMPERATURE SENSOR. AMBI ENT OR FLOOR CONTROL. 0.5A , 24V, R, C, W. 15 MIN. CYCLES, BACKLIT SCREEN | Resideo
Brand: Resideo
SKU: TH114-AF-024T
$130.08 each
View Details HONEYWELL RESIDENTIAL Q3400A1024 HOT SURFACE PILOT IGNITER/SENSOR ASSY FOR SMARTVALVE PILOTS, 30" LEADS. HOT SURFACE PILOT BURNER. A LSO REPL'S Q3400A1008 AND Q3400A1032. | Midwest Supply Us
Q3400A1024 | HOT SURFACE PILOT IGNITER/SENSOR ASSY FOR SMARTVALVE PILOTS, 30" LEADS. HOT SURFACE PILOT BURNER. A LSO REPL'S Q3400A1008 AND Q3400A1032. | HONEYWELL RESIDENTIAL
Brand: HONEYWELL RESIDENTIAL
SKU: Q3400A1024
$97.13 each
View Details Resideo H6062A1000 HUMIDIPRO DIGITAL HUMIDITY CONTROL. HUMIDISTAT OR DEHUMIDISTAT. AUTOMATIC (WINDOW PROTECTION) OR MANUAL CONTROL. INCLUDES OUTDOOR SENSOR.TRADELINE. | Midwest Supply Us
H6062A1000 | HUMIDIPRO DIGITAL HUMIDITY CONTROL. HUMIDISTAT OR DEHUMIDISTAT. AUTOMATIC (WINDOW PROTECTION) OR MANUAL CONTROL. INCLUDES OUTDOOR SENSOR.TRADELINE. | Resideo
Brand: Resideo
SKU: H6062A1000
$103.45 each
View Details Resideo VWS01Y-11/4 L5ActW1.25"BallVlvW/LeakSensor | Midwest Supply Us
VWS01Y-11/4 | L5ActW1.25"BallVlvW/LeakSensor | Resideo
Brand: Resideo
SKU: VWS01Y-11/4
$387.86 each
View Details Resideo C7089R3013 Outdoor Temperature Sensor | Midwest Supply Us
C7089R3013 | Outdoor Temperature Sensor | Resideo
Brand: Resideo
SKU: C7089R3013
$113.43 each
View Details HONEYWELL RESIDENTIAL C7189R3002-2 Indoor Air Sensor RL3.0 2 Pack Replaces C7189R2002-2 | Midwest Supply Us
C7189R3002-2 | Indoor Air Sensor RL3.0 2 Pack Replaces C7189R2002-2 | HONEYWELL RESIDENTIAL
Brand: HONEYWELL RESIDENTIAL
SKU: C7189R3002-2
View Details
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Brand: Norgas Controls
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