HVAC Controls

Increase energy savings and easily control heating and cooling systems with HVAC controls. Utilize easy-to-install fresh air ventilation panels, furnace control boards, HVAC control boards, building automation panels, and kits to introduce clean air into buildings. Control multiple aspects of a system with highly universal digital controls. Also, shop our selection of replacement parts for controllers and larger equipment, defrost controllers, even fireplace controls. Our specialty controls selection addresses unique problems that push the boundaries of innovation within the industry. If you are a contractor check out items like the Wireless Lodge Watch from iO HVAC Controls or the Duel Fuel Kit.

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Showing 3169–3216 of 5282 resultsSorted by popularity

Delay-On-Break Timer

Littelfuse

SKU: HRDB423
$94.09
MSRP: $108.20
You save 15%
Littelfuse HRDB423 Delay-On-Break Timer quantity
120Vac Temperature Limit Hydrostat for Oil Boilers

Hydrolevel

SKU: 3150
$227.28
MSRP: $261.37
You save 15%
Hydrolevel 3150 120Vac Temperature Limit Hydrostat for Oil Boilers quantity
3/4″ NPT Short Ceramic Sensing Probe – 2 1/16″ Inside Dimension

Hydrolevel

SKU: EL1214-LSV
$107.23
MSRP: $123.31
You save 15%
Hydrolevel EL1214-LSV 3/4" NPT Short Ceramic Sensing Probe – 2 1/16" Inside Dimension quantity
24V Smart Hydrostat for Boiler Temperature Control

Hydrolevel

SKU: 48-3204SF
$300.99
MSRP: $346.14
You save 13%
Hydrolevel 48-3204SF 24V Smart Hydrostat for Boiler Temperature Control quantity
24V Smart Hydrostat for Boiler Temperature Control

Hydrolevel

SKU: 48-3203SF
$291.39
MSRP: $335.10
You save 13%
Hydrolevel 48-3203SF 24V Smart Hydrostat for Boiler Temperature Control quantity
Outdoor Sensor Kit for Hydrostat 3200-Plus and 3250-Plus (OS-100)

Hydrolevel

SKU: 48-140
$67.34
MSRP: $77.44
You save 15%
Hydrolevel 48-140 Outdoor Sensor Kit for Hydrostat 3200-Plus and 3250-Plus (OS-100) quantity
120Vac High Water Limit and Pump Controller with EL1214-SV and EL1214-RSV Sensing Probes

Hydrolevel

SKU: 727
$431.90
MSRP: $496.69
You save 13%
Hydrolevel 727 120Vac High Water Limit and Pump Controller with EL1214-SV and EL1214-RSV Sensing Probes quantity
24V Smart Hydrostat – 100–190°F Temperature Control

Hydrolevel

SKU: 48-3002
$187.35
MSRP: $215.45
You save 15%
Hydrolevel 48-3002 24V Smart Hydrostat – 100–190°F Temperature Control quantity
3/4″ NPT Sensing Probe with 1-15/16″ Insertion Length for 1150 Series Controls

Hydrolevel

SKU: EL1150
$35.26
MSRP: $40.55
You save 13%
Hydrolevel EL1150 3/4" NPT Sensing Probe with 1-15/16" Insertion Length for 1150 Series Controls quantity
120Vac Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Oil Boilers

Hydrolevel

SKU: 3250
$230.35
MSRP: $264.90
You save 15%
Hydrolevel 3250 120Vac Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Oil Boilers quantity
Wireless Outdoor Sensor Kit for Hydrostat 3200-Plus and 3250-Plus (OS-200)

Hydrolevel

SKU: 48-145
$246.60
MSRP: $283.59
You save 15%
Hydrolevel 48-145 Wireless Outdoor Sensor Kit for Hydrostat 3200-Plus and 3250-Plus (OS-200) quantity
24Vac Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Gas Boilers

Hydrolevel

SKU: 48-3000
$208.85
MSRP: $240.18
You save 13%
Hydrolevel 48-3000 24Vac Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Gas Boilers quantity
3/4″ NPT Ceramic Sensing Probe with Junction Box and 2-7/8″ Insertion Length

Hydrolevel

SKU: EL1214-R
$98.55
MSRP: $113.33
You save 15%
Hydrolevel EL1214-R 3/4" NPT Ceramic Sensing Probe with Junction Box and 2-7/8" Insertion Length quantity
120Vac Control Box for 250 Series Low Water Cut-Offs

Hydrolevel

SKU: 250-CO
$522.96
MSRP: $601.40
You save 15%
Hydrolevel 250-CO 120Vac Control Box for 250 Series Low Water Cut-Offs quantity
Foot Mounted Actuator

Honeywell Home

SKU: M7164A1017
$1,072.38
MSRP: $1,233.24
You save 15%
Honeywell M7164A1017 Foot Mounted Actuator quantity
3/4″ NPT Ceramic Sensing Probe with 2-7/8″ Insertion Length and 1-11/16″ Long Nut

Hydrolevel

SKU: EL1214-P
$88.73
MSRP: $102.04
You save 13%
Hydrolevel EL1214-P 3/4" NPT Ceramic Sensing Probe with 2-7/8" Insertion Length and 1-11/16" Long Nut quantity
1/2″ NPT Ceramic Sensing Probe with Junction Box and 2-7/8″ Insertion Length

Hydrolevel

SKU: EL1220-R
$98.55
MSRP: $113.33
You save 13%
Hydrolevel EL1220-R 1/2" NPT Ceramic Sensing Probe with Junction Box and 2-7/8" Insertion Length quantity
1/2″ NPT Short Ceramic Sensing Probe with 2-1/16″ Insertion Length

Hydrolevel

SKU: EL1220-SV
$70.23
MSRP: $80.76
You save 15%
Hydrolevel EL1220-SV 1/2" NPT Short Ceramic Sensing Probe with 2-1/16" Insertion Length quantity
1/2″ NPT Ceramic Sensing Probe with 2-7/8″ Insertion Length

Hydrolevel

SKU: EL1220
$70.23
MSRP: $80.76
You save 15%
Hydrolevel EL1220 1/2" NPT Ceramic Sensing Probe with 2-7/8" Insertion Length quantity
3/4″ NPT Short Ceramic Sensing Probe with 2-1/16″ Insertion Length

Hydrolevel

SKU: EL1214-SV
$70.23
MSRP: $80.76
You save 15%
Hydrolevel EL1214-SV 3/4" NPT Short Ceramic Sensing Probe with 2-1/16" Insertion Length quantity
4′ Replacement Sensor for Hydrostat Controllers

Hydrolevel

SKU: 48-3250-58
$36.99
MSRP: $42.54
You save 15%
Hydrolevel 48-3250-58 4' Replacement Sensor for Hydrostat Controllers quantity
24″ Replacement Sensor for Hydrostat Controllers

Hydrolevel

SKU: 48-3250-59
$30.35
MSRP: $34.90
You save 13%
Hydrolevel 48-3250-59 24" Replacement Sensor for Hydrostat Controllers quantity
3/4″ NPT Ceramic Sensing Probe with 2-7/8″ Insertion Length

Hydrolevel

SKU: EL1214
$70.23
MSRP: $80.76
You save 15%
Hydrolevel EL1214 3/4" NPT Ceramic Sensing Probe with 2-7/8" Insertion Length quantity
Ctrlr Pcb Auu18Rlf Hy

Fujitsu

SKU: 9710621765
$113.30
MSRP: $130.30
You save 15%
Fujitsu 9710621765 Controller Pcb Auu18Rlf quantity
Controller Printed Circuit Board

Fujitsu

SKU: 9709427330
$70.01
MSRP: $80.51
You save 15%
Fujitsu 9709427330 Controller Printed Circuit Board quantity
Communication Pcb Assy

Fujitsu

SKU: 9710019005
$37.86
MSRP: $43.54
You save 15%
Read more
Thrmst Pipe Red Pac Hfi

Fujitsu

SKU: 9900959012
$16.95
MSRP: $19.49
You save 15%
Read more
Power Filter PCB AR High Frequency Interface

Fujitsu

SKU: 9707398243
$113.13
MSRP: $130.10
You save 13%
Read more
12″ Replacement Sensor for Hydrostat Controllers

Hydrolevel

SKU: 48-3250-60
$27.60
MSRP: $31.74
You save 15%
Hydrolevel 48‑3250‑60 12" Replacement Sensor for Hydrostat Controllers quantity
Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Gas Boilers

Hydrolevel

SKU: 3200-PLUS
$255.69
MSRP: $294.04
You save 15%
Hydrolevel 3200-PLUS Fuel Smart Hydrostat – Temperature Limit & Boiler Reset for Gas Boilers quantity
Pressure Switch 30 PSI On / 50 PSI Off

Sta-Rite

SKU: U217-1219
$124.65
MSRP: $143.35
You save 15%
Sta-Rite U217-1219 Pressure Switch 30 PSI On / 50 PSI Off quantity
Pressure Switch FSG-2 30–50 PSI

Sta-Rite

SKU: U217-2EB
$64.26
MSRP: $73.90
You save 15%
Read more
Temperature Control 27 to 49°F Adjustable Range

Ranco

SKU: A30-3842
$100.91
MSRP: $116.05
You save 13%
Ranco A30-3842 Temperature Control 27 to 49°F Adjustable Range quantity
SPDT Temperature Control 59–90°F with 39″ Capillary

Ranco

SKU: A22-2453
$136.76
MSRP: $157.27
You save 15%
Ranco A22-2453 SPDT Temperature Control 59–90°F with 39" Capillary quantity
Refrigeration Temperature Control SPST with 84″ Capillary

Ranco

SKU: A30-304
$99.91
MSRP: $114.90
You save 15%
Ranco A30-304 Refrigeration Temperature Control SPST with 84" Capillary quantity
Ice Harvest Temperature Control SPDT -19 to 22°F with 72″ Capillary

Ranco

SKU: A22-4506
$131.93
MSRP: $151.72
You save 15%
Ranco A22-4506 Ice Harvest Temperature Control SPDT -19 to 22°F with 72" Capillary quantity
DPST Low Pressure Control 100/400 PSI with 36″ Capillary

Ranco

SKU: O20-7006
$200.93
MSRP: $231.07
You save 15%
Ranco O20-7006 DPST Low Pressure Control 100/400 PSI with 36" Capillary quantity
Low Temperature Control -35 to 15°F with 72″ Capillary

Ranco

SKU: O10-1419
$133.94
MSRP: $154.03
You save 15%
Read more
Refrigeration Temperature Control SPST with 42″ Capillary

Ranco

SKU: A30-184
$86.81
MSRP: $116.05
You save 25%
Read more
Self Diagnostic Circuit Board

Detroit Radiant Products

SKU: TP-1251
$215.73
MSRP: $248.09
You save 15%
Detroit Radiant TP-1251 Self Diagnostic Circuit Board quantity
COMBUSTION PRESSURE SWITCH N/O

Detroit Radiant Products

SKU: TP-264C
$72.31
MSRP: $83.16
You save 15%
Detroit Radiant TP-264C Combustion Pressure Switch N/O quantity
1.13″WC PRESSURE SWITCH

Detroit Radiant Products

SKU: TP-1060F
$72.31
MSRP: $83.16
You save 15%
Detroit Radiant TP-1060F Pressure Switch quantity
CIRCUIT BOARD

Detroit Radiant Products

SKU: TP-3051
$220.08
MSRP: $253.09
You save 15%
Detroit Radiant TP-3051 Circuit Board quantity
Power Filt Pcb Auu36Rclx

Fujitsu

SKU: 9704561336
$190.19
MSRP: $218.72
You save 15%
Fujitsu 9704561336 Power Filter Pcb quantity
Comp 36/45/48 Hvab Dww

Fujitsu

SKU: 9810275004
$678.11
MSRP: $779.83
You save 15%
Read more
Mechanical Non-Programmable Thermostat, 2-Wire Line Voltage Electric Heat

Pro1 IAQ

SKU: T501ML2
$25.09
MSRP: $28.85
You save 13%
PRO1 T501ML2 Mechanical Non-Programmable Thermostat, 2-Wire Line Voltage Electric Heat quantity
Replacement keys compatible with the T150 thermostat guard

Pro1 IAQ

SKU: T150K
$4.89
MSRP: $5.62
You save 13%
PRO1 T150K Replacement Keys for T150 Thermostat Guard quantity
2-Gang Power & Low Voltage Divider for SmarToggle ST2

Morris

SKU: ST2W
$2.61
MSRP: $3.00
You save 13%
Morris ST2W SmarToggle 2-Gang Power & Low Voltage Divider quantity