Capacitors & Hard Starts

HVAC Capacitors & Hard Starts

The HVAC Capacitors & Hard Starts category focuses on the start and run components that keep compressors and fan motors operating smoothly under real-world conditions. A healthy capacitor allows motors to start quickly, run at the correct torque and reduce heat, while a correctly selected hard-start kit helps tough or marginal compressors get moving when line voltage is low or head pressure is high. Stocking the right run capacitors, start capacitors, dual capacitors and hard-start kits is essential for fast, profitable service calls.

In this section you’ll find single-value run capacitors, dual-run capacitors, start capacitors, hard-start kits and capacitor mounting accessories sized for common residential and light-commercial HVAC equipment. Options include round and oval cans, various µF values, higher voltage ratings for durability, and pre-wired hard-start kits with potential relays or PTC devices. Whether you’re restoring a non-starting condensing unit, quieting a noisy fan motor or protecting a compressor on marginal power, this category gives you the parts to get the system back on line.

• Run capacitors for condenser fan motors, blower motors and compressors.
• Dual-run capacitors that handle both compressor and outdoor fan in one can.
• Start capacitors for high-torque motor starting on select systems.
• Hard-start kits including capacitor + relay assemblies for difficult starts.
• Mounting brackets & accessories to secure replacements in tight compartments.

When selecting HVAC capacitors and hard starts, never guess on values. Match the microfarad (µF) rating exactly and use an equal or higher voltage rating compared to the original component or motor nameplate. Verify single vs dual configuration, terminal labels (C, FAN, HERM), physical can dimensions, ambient temperature rating and mounting orientation. For hard-start kits, follow manufacturer guidelines for compressor horsepower/tonnage, voltage and starting characteristics. Use the Compare tools on this page to review µF value, voltage, can style and application notes before ordering.

Pro tip: Always discharge capacitors safely and verify failure with a quality meter rather than replacing on suspicion alone. Document compressor model, nameplate data, existing capacitor value, line voltage and measured amp draw. That information helps you choose the correct run capacitor and hard-start kit and confirm that low voltage, airflow or charge issues aren’t the real cause of a hard-starting compressor.