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Horizontal Circulator Coupling, 1/2 in. x 3/8 in. Dia. x 2 in. L
Our Price:$34.94This coupling is a circulator pump accessory for HVAC service teams working with compatible horizontal circulators. It provides the specified coupling component needed when servicing the circulator...
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HVAC Backpack Tool Bag with 19 Pockets
Our Price:$149.94This backpack tool bag helps HVAC technicians carry, organize, and access essential tools on service and installation jobs. Its hands-free backpack design keeps equipment together while leaving hands...
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HVAC Coil Cleaning Foaming Nozzle
Our Price:$94.94This foaming nozzle attachment is for HVAC service professionals cleaning condenser and evaporator coils, including coils in refrigeration units. It helps apply a thick lather that coats coil...
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HVAC Manifold for R-22, R-404A and R-410A
Our Price:$125.94This HVAC manifold is designed for technicians working with R-22, R-404A, and R-410A systems. It provides an organized connection point for hoses and gauges during HVAC service work.The manifold has...
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HVAC Service Plug and Gasket Set, 1/4 in. and 5/16 in., 10-Pack
Our Price:$14.24This 10-pack of HVAC service plugs and gaskets is for technicians servicing refrigerant hoses. It helps trap refrigerant in the hose after disconnection while supporting quick fitting attachment...
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HVAC Tool Backpack
Our Price:$73.94This HVAC tool backpack is for service and maintenance professionals who need a hands-free way to carry their work essentials. Its top-zip design helps keep the contents together while moving between...
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HVAC Torque Wrench Kit
Our Price:$76.94This HVAC torque wrench kit helps service professionals achieve accurate fitting tightness, particularly when working with R410A fittings. It provides a selection of metric sizes for installation and...
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Insulated Sleeve Bearing for 1 in. Shafts
Our Price:$60.94This insulated sleeve bearing is designed for maintenance professionals servicing equipment with a 1-inch shaft. It supports shaft operation while providing an insulating component for the bearing...
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Insulated Sleeve Bearing for 5/8 in. Shaft
Our Price:$47.94This insulated sleeve bearing is an HVAC motor accessory for maintenance and service buyers who need a bearing for a 5/8 in. shaft. It helps buyers specify a compatible bearing component when...
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Intellasense III Combustible Gas Leak Detector
Our Price:$299.94The Intellasense III Combustible Gas Leak Detector is a handheld test instrument for HVAC service professionals who need to check for gas leaks during diagnostic work. It helps users identify the...
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Large Piercing Valve for 1/2 in. and 5/8 in. Copper Tubing
Our Price:$14.49This large piercing valve is for HVAC technicians working with 1/2 in. and 5/8 in. copper tubing. It provides a valve installation solution designed to create a sealed connection on the tubing.The...
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Large Universal Thermostat Guard with Clear Cover and Opaque Wallplate
Our Price:$78.94This large universal thermostat guard is designed for facilities and building users who need to cover compatible thermostats while keeping the thermostat visible. Its clear cover, base, and opaque...
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Liquid-Filled Vac-Bolt Vacuum Test Gauge, 0–30 in. Hg
Our Price:$64.94This liquid-filled Vac-Bolt test gauge helps HVAC service professionals read vacuum levels on compatible filter canister setups. It supports vacuum checking without disconnecting pump fittings or oil...
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Liquid-Filled Vacuum Pump Test Gauge, 0–30 Hg
Our Price:$47.94This liquid-filled vacuum pump test gauge is designed for oil burner service professionals who need to check vacuum readings during equipment testing and service. Its large dial face helps make...
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Low-Limit Circulator Control Aquastat
Our Price:$375.94This low-limit circulator control aquastat is for HVAC maintenance professionals and commercial facilities managing temperature-control equipment. It provides circulator control and low-limit...
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Low-Pressure SPST Refrigerant Pressure Switch, 5 PSI Open / 30 PSI Close
Our Price:$15.99This low-pressure refrigerant pressure switch is for HVAC and refrigeration technicians who need to monitor pressure in systems using HFC, HCFC, or CFC refrigerants. It opens on a pressure fall at 5...
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Low-Pressure SPST Switch, 10 PSI Open/25 PSI Closed
Our Price:$19.49This low-pressure SPST switch is for HVAC technicians and service professionals who need to control equipment operation in response to system pressure. It opens at 10 PSI and closes at 25 PSI for...
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Low-Pressure SPST Switch, 15 PSI Open / 35 PSI Closed
Our Price:$16.74This low-pressure SPST switch is for HVAC technicians and service professionals who need to monitor pressure and control condenser fan cycling. It opens at 15 PSI and closes at 35 PSI to support...
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Low-Pressure SPST Switch, 25 PSI Open / 65 PSI Close
Our Price:$15.24This low-pressure SPST switch is for HVAC technicians and service professionals who need to control equipment response to changing system pressure. It opens at 25 PSI on a pressure fall and closes at...
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Low-Pressure SPST Switch, 5 PSI Open / 20 PSI Closed
Our Price:$18.99This low-pressure SPST switch is for HVAC technicians and service professionals who need to control pressure-responsive equipment operation. It opens at 5 PSI and closes at 20 PSI for condenser fan...
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HVAC Controls, Parts & Service: Everything You Need to Keep Your System Running
Whether you're replacing a worn component, upgrading system controls, or performing routine maintenance, this category covers the essential parts and equipment that keep heating and cooling systems operating efficiently. Use the subcategory paths below to find exactly what your job requires.
Choose your starting point
Popular examples in this category
High-Limit Oil Aquastat Relay, 120VWBB394547
Bluetooth Circulator Pump Communication ModuleWBB1529849
Industrial Plug-In Temperature Controller with Power Cord, 40° to 110°FWBB970415
Clear Plastic Thermostat GuardWBB860061Keeping HVAC Systems Operational and Efficient
These products support repair, maintenance, and replacement tasks across residential and commercial HVAC systems. From failed capacitors to worn pump bearings, having the right part on hand reduces downtime, restores comfort, and extends the working life of heating and cooling equipment.
Start With the System and the Problem
Identify the system type (hydronic, forced air, refrigeration), the failing or worn component, and the specifications required—voltage, flow rate, pressure rating, or physical dimensions. Matching specs precisely prevents compatibility issues and callbacks on completed jobs.
Where These Parts and Controls Are Used
Common applications include boiler and hydronic heating systems, split and packaged air conditioning units, commercial refrigeration, and ventilation systems. Parts like circulator pumps, capacitors, and aquastats are used in both new installations and service replacement scenarios.
Sourcing Tips and Service Considerations
Always verify OEM specifications or cross-reference part numbers before ordering. For service work, stocking common failure items—capacitors, condensate pumps, and bearings—reduces truck rolls and speeds up repairs. Cleaning equipment supports preventive maintenance programs that lower long-term service costs.
Which Subcategory Do You Need? A Quick Reference
Match your service need to the right subcategory path using this guide.
| Need | Best Fit Subcategory | Why It Matters |
|---|---|---|
| Control boiler water temperature | Aquastats | Aquastats regulate when the boiler fires based on water temperature setpoints, protecting the system and maintaining efficiency |
| Replace a failed motor or pump component | Bearings or Circulator Pump Accessories | Bearings and accessories allow targeted repair without full pump replacement, saving cost and labor time |
| Restore circulation in a hydronic system | Circulator Pumps | The right pump must match system flow rate and head pressure to maintain proper heat distribution |
| Fix a non-starting AC or refrigeration unit | Capacitors or Compressors | Capacitors are a common low-cost fix; if the compressor itself has failed, replacement is required |
| Remove standing water from drain pans | Condensate Pumps | Condensate pumps prevent water damage and mold by actively removing condensate when gravity drainage isn't available |
| Perform seasonal system cleaning | HVAC Cleaning Equipment | Regular coil and drain cleaning maintains airflow, efficiency, and indoor air quality across all system types |
Plan the right fit before choosing
Step 1: Identify the System and Failure Point
Before selecting any part or control, confirm the system type and the specific component that needs attention. Hydronic systems rely heavily on circulator pumps, aquastats, and bearings, while refrigerant-based systems commonly require capacitors and compressors.
- Note the system voltage, BTU capacity, and fluid or refrigerant type
- Check whether the failure is electrical, mechanical, or related to flow and pressure
- Confirm whether you need an exact replacement or an equivalent cross-reference
Step 2: Match Specifications to the Application
Each subcategory has critical spec requirements. Capacitors must match microfarad and voltage ratings. Circulator pumps require correct flow rate and head pressure. Aquastats need the right temperature range for the system they control.
- Use the existing part number or equipment nameplate data as your starting point
- For pumps and compressors, verify flange size, port configuration, and mounting style
- For controls like aquastats, confirm setpoint range and differential settings
Step 3: Plan for Preventive Maintenance
Many service calls can be reduced by stocking high-failure-rate components and scheduling regular cleaning and inspection. HVAC cleaning equipment and condensate pump maintenance are often overlooked until a system failure occurs.
- Stock capacitors and condensate pumps as common wear items for service vans
- Schedule coil and drain line cleaning seasonally to prevent efficiency loss
- Inspect bearings and pump accessories annually in hydronic systems
From aquastats to compressors, each subcategory focuses on a specific part or function so you can navigate directly to what you need.
Most HVAC service calls involve either an electrical component failure (capacitor, control) or a mechanical one (bearing, pump, compressor), and this category covers both.
Parts and controls in this category are used across light residential systems, large commercial HVAC installations, and industrial climate control applications.
Whether you're responding to a breakdown or running a scheduled maintenance program, this category includes parts and equipment for both approaches.
Common questions before buying
How do I know if I need a capacitor or a compressor replacement?
Start with the capacitor—it's a common, low-cost failure point that can prevent a compressor from starting. Test the capacitor first. If it checks out and the compressor still won't run, further diagnosis of the compressor is warranted.
What specifications do I need to replace a circulator pump?
You'll need the flow rate (GPM), head pressure (feet of head), pipe connection size, and voltage. Check the nameplate on the existing pump or the system design documents to confirm these values before ordering.
Can I use HVAC cleaning equipment on both residential and commercial systems?
Yes, but verify that the equipment capacity and chemical compatibility match the system size and coil material. Some commercial systems require higher-pressure coil cleaning tools than those used in residential applications.
What is an aquastat and when does it need to be replaced?
An aquastat is a temperature control device used in hydronic heating systems to regulate boiler operation. It may need replacement if the system short-cycles, fails to reach setpoint, or if the control shows signs of electrical failure during testing.