Capacitors

Get reliable capacitors for fast HVAC fixes. We stock run capacitors and start capacitors in round and oval cans to keep compressors and fan motors working-at budget-friendly prices.

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Capacitors

Whether you’re a DIY capable homeowner, licensed contractor, property manager, or supporting light commercial sites, our capacitor selection covers the most-used values and case styles. Shop Round Single, Round Dual, Oval Single, and Oval Dual, plus BULK CLEARANCE for fleet and inventory builds. From single replacements to assortment kits, you’ll find options from about $20 to large-value packs for high-volume service up to $4670.

Choosing the right part is simple: match the microfarad (µF) rating and voltage. A single run capacitor serves one motor, while a dual run capacitor supports two circuits (typically compressor and condenser fan) with C, FAN, and HERM terminals. Common voltages are 370 VAC and 440/450 VAC; it’s fine to replace a 370 with a 440/450 when the µF value matches-never go lower in voltage. Round vs. oval mainly affects mounting space; electrical function is identical when ratings match.

Capacitors are not rated by SEER2, HSPF2, BTU/tonnage, or refrigerant. Instead, focus on µF value, voltage, tolerance (often ±5-6%), temperature rating (70°C or 85°C), and terminal size. For outdoor units, look for corrosion-resistant cans and higher hour/temperature ratings. Use these parts to replace failed HVAC run/start capacitors, restore compressor or fan motor operation, and keep maintenance stock ready for service calls or bulk fleet repairs.

Top Brands for Capacitors

We stock trusted choices from Supco, Amrad, and value-priced Generic, with additional selections from ICM and Mars to cover specialized needs and truck stock.

Frequently Asked Questions

  • How do I choose between single and dual run capacitors?

    Use a single run for one motor. Choose a dual run if your unit uses one can for both compressor and fan (terminals C, FAN, HERM).

  • What measurements or ratings do I need from my old capacitor to find a match?

    Match the microfarads (µF) and voltage (370 or 440/450 VAC). Also note tolerance, case style (round/oval), dimensions, and terminal size.

  • Can I replace a round capacitor with an oval one?

    Yes, if the µF and voltage match and it physically fits or can be secured with an appropriate bracket or strap.

  • Are there safety precautions for discharging and replacing a capacitor?

    Disconnect power, verify zero volts, then discharge with a 20k-50kΩ resistor across terminals. Use insulated tools and label wires.

  • Which brands are most commonly used for HVAC capacitor replacements?

    Supco and Amrad are widely used, with value from Generic. Many technicians also use ICM and Mars in service stock.

  • Do bulk clearance capacitors have the same warranty as standard items?

    Warranty terms vary by item. Clearance units are new; coverage follows each listing’s warranty notes and any manufacturer terms.

  • How do I know if my capacitor is failing versus a bad motor?

    Bulging tops, leaks, burnt terminals, humming motors, or no-start fans suggest a bad capacitor. Verify with a meter to check µF.

  • What temperature or environmental ratings should I consider for outdoor units?

    Look for 70°C or 85°C ratings, corrosion-resistant cans, and higher hour ratings for heat, moisture, and vibration exposure.

  • Can I use a higher voltage capacitor than the original?

    Yes. Replacing 370 VAC with 440/450 VAC is acceptable if the µF matches. Do not use a lower voltage than specified.

  • What do C, FAN, and HERM mean on a dual capacitor?

    C is common, FAN connects to the condenser fan motor, and HERM to the compressor. Confirm wiring before removal and reattach snugly.

Common FAQ Quick Education

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