Capacitors

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HVAC CONTROLS — CAPACITORS

HVAC Run & Start Capacitors

We help contractors source run capacitors, start capacitors, and dual-run capacitors for HVAC compressors, condenser fan motors, and blower motors. Availability may vary by supplier, stock status, manufacturer policy, and product type.

What This Category Includes

ⓘ Capacitor replacement requires matching MFD rating (±5%) and meeting or exceeding the original voltage rating. Always discharge capacitors before handling. Submit your existing capacitor specifications or equipment model/serial number for sourcing support.

Run Capacitors

Single-value run capacitors for condenser fan motors and blower motors. Available in a wide range of MFD and voltage ratings.

Dual-Run Capacitors

Two-in-one capacitors for compressor and condenser fan motor circuits. Common in residential air conditioning systems.

Start Capacitors

High-capacitance capacitors for motor starting assistance. Used with hard start kits or start relay assemblies.

Motor Capacitors

Capacitors for PSC and ECM motor applications in air handlers and furnaces.

Hard Start Kits

Start capacitor and relay assemblies for compressors with hard starting conditions.

Capacitor Accessories

Capacitor brackets, discharge tools, and testing equipment for safe capacitor service.

Specification	What to Match	Notes
MFD (Capacitance)	Match within ±5% of original rating	Higher MFD = more starting torque; too high can damage motor
Voltage Rating (VAC)	Must meet or exceed original rating	Common ratings: 370VAC, 440VAC
Type	Run, Start, or Dual-Run	Must match circuit application
Terminal Type	Blade, screw, or wire lead	Match existing wiring connections

Sourcing HVAC Capacitors for Service & Maintenance

Capacitor failure is one of the most common causes of HVAC system no-cooling and no-heating service calls. A failed run capacitor causes the condenser fan motor or compressor to draw locked rotor amperage, trip the breaker, or fail to start entirely. For high-volume HVAC service companies, maintaining a working stock of the most common capacitor values — typically 5, 7.5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, and 60 MFD in both 370VAC and 440VAC ratings — reduces return trips and allows same-day repairs. HVACProSales helps contractors source capacitors in single units or bulk quantities with fast shipping to support active service operations.

Who We Serve

HVAC Service Contractors

Source capacitors in bulk for high-volume service operations. Maintain working stock of common MFD/voltage combinations to support same-day repairs.

Facility & Maintenance Managers

Procure replacement capacitors for commercial HVAC systems. Consolidate multi-SKU capacitor orders into a single B2B procurement workflow.

ⓘ Brand availability may vary by supplier, stock status, and manufacturer policy. Capacitor replacement requires matching MFD rating within ±5% and meeting or exceeding the original voltage rating. Submit your existing capacitor specifications or equipment model/serial number for sourcing support.

Frequently Asked Questions

How do I identify the correct replacement capacitor?

Locate the capacitor label on the existing component. Key specifications: capacitance in MFD or µF, voltage rating in VAC, and type (run, start, or dual-run). The replacement must match the original MFD rating within ±5% and meet or exceed the original voltage rating. Dual-run capacitors list two values (e.g., 45+5 MFD) — both values must be matched.

How do I safely discharge a capacitor?

Capacitors store electrical charge and can deliver a dangerous shock even after power is disconnected. Always discharge capacitors before handling using an insulated resistor (10,000 ohm, 10W) or a dedicated capacitor discharge tool. Never short capacitor terminals directly with a screwdriver or wire.

What is the difference between a run capacitor and a start capacitor?

A run capacitor remains in the circuit during normal motor operation to improve efficiency and power factor. A start capacitor is only in the circuit during motor startup to provide extra starting torque, then is switched out by a relay. Most residential HVAC motors use run capacitors; some use both.