Air Conditioner Capacitor Parts

Air Conditioner Capacitor Parts: Start & Run Capacitors for Every Brand

Capacitors are the hardest-working electrical parts in your air conditioner. A failed run capacitor is the #1 reason your unit hums but won't start, or cycles on and off without cooling. Start capacitors give the compressor the initial kick it needs; run capacitors keep it going. Both fail predictably — usually between 3–5 years — and replacing them is one of the most cost-effective repairs you can make.

We stock OEM run capacitors, start capacitors, and dual-run capacitors for, and every major brand. Find your model number on your unit's nameplate, and we'll match the exact microfarad (µF) and voltage rating your system needs.

• Unit won't start but compressor hums: Run capacitor failure — most common sign
• Compressor cycles repeatedly: Capacitor losing charge between cycles
• Weak cooling, reduced airflow: Blower or condenser fan capacitor worn out
• Burning smell near outdoor unit: Capacitor overheating or shorted internally
• Visible bulging or leakage on capacitor: Imminent failure — replace immediately

Air Conditioner Capacitor FAQ

What's the difference between a run capacitor and a start capacitor?

A start capacitor delivers a big burst of energy to jolt the compressor motor into motion, then disconnects. A run capacitor stays in the circuit continuously, smoothing power delivery and maintaining voltage. Most modern units use a dual-run capacitor that handles both jobs. If your compressor hums without starting, the run capacitor is likely dead.

How do I find the correct capacitor microfarad (µF) rating for my air conditioner?

Look at your unit's nameplate — usually on the back of the outdoor compressor unit or inside the indoor handler. It lists the exact µF and voltage (often 370V or 440V). Never guess: installing the wrong capacitor stresses your motor and can create compatibility or performance problems. Use your model number to search our parts catalog, and we'll confirm the exact replacement.

Why do air conditioner capacitors fail so quickly?

Capacitors degrade from heat cycling and electrical stress. The hotter your unit runs — and the longer the cooling season — the faster they wear out. High humidity, power surges, and oversized systems accelerate failure. Replacing a failed capacitor now costs $50–150; ignoring it can burn out your compressor ($1,500+).

Can I replace an air conditioner capacitor myself?

Capacitors store electrical charge and can cause serious injury if mishandled. If you're comfortable with electrical work, discharge the capacitor safely with an insulated screwdriver before removal. Otherwise, hire a technician. We provide OEM parts and detailed diagrams — you decide the job scope.

Order Air Conditioner Capacitor Replacement Parts Online

When your air conditioner requires a capacitor replacement, finding the right part online is required for restoring reliable operation. At Repair Clinic, we offer genuine air conditioner capacitor replacements to ensure the right fit and durability. Enjoy the convenience of same-day shipping to get your system back up and running quickly. Our easy-to-use model number and part number lookup tools make finding the exact capacitor a breeze. Plus, our No-Hassle 365-Day Returns and Price Match Guarantee help you order with confidence. If you're experiencing issues like the air conditioner fan not working or the compressor not running, a faulty capacitor could be the cause. For more insights into A/C troubleshooting, visit our Air Conditioner Repair Help page. For additional parts, browse our Air Conditioner Parts section.

Narrow Air Conditioner Parts to Your Exact Model

Check the exterior nameplate on the condenser first, then look inside the access panel or along the side of the cabinet if the label is not visible. The model number identifies your complete air conditioner, not just its capacitor, so copy it exactly, including letters, numbers, and dashes. Enter it in the search bar to filter the catalog to parts that fit your model. This helps narrow the full selection to compatible capacitors and every other associated air conditioner part. You can confirm the match before ordering and avoid sorting through specifications that do not apply to your unit.