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Common Causes of AC Capacitor Failure - What Does an AC Capacitor Do?

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What Does an AC Capacitor Do? A Homeowner’s Guide

What Does an AC Capacitor Do? A Homeowner’s Guide

Quality Comfort Florida

⚡ What Does an AC Capacitor Do? Your Guide to This Critical AC Component

Ever wonder what keeps your AC running strong on the hottest Florida day? Meet the AC capacitor — the tiny powerhouse that gives your system the jolt it needs to start up and stay cool. When it fails, your air conditioner can’t do its job. This page explains how capacitors work, why they fail, and what to do when they fail.

💡 What Is an AC Capacitor?

An AC capacitor stores and releases electricity to power the motors in your air conditioner. It provides the initial boost your system needs to start and keeps it running efficiently.

There are two main types:

  • Start Capacitor – Provides the burst of energy needed to start the compressor and fan motors.
  • Run Capacitor – Maintains a steady flow of electricity to keep the system running.

Some systems use a dual capacitor, which handles both start and run functions in one part, common in residential AC systems across Brevard County.

🔧 Signs Your AC Capacitor Is Failing

Watch for these symptoms:

  • Humming from the outdoor unit
  • AC won’t start or takes too long
  • Blowing warm air
  • Burning smell from the unit
  • High electric bills
  • AC shuts off on its own

Visual signs like bulging, leaking, or a swollen capacitor are also red flags.

🧯 What Causes Capacitors to Fail?

AC capacitors fail for several reasons, especially in Florida’s tough climate:

  • 🔥 Heat Exposure – Intense temperatures and sun exposure wear capacitors down faster.
  • ⚡ Power Surges – Storms and voltage spikes can fry internal components.
  • 🧹 Dirt & Dust – Clogged coils and dirty outdoor units can overheat the capacitor.
  • 📆 Age – Most capacitors last 5–10 years. Older units are more likely to fail suddenly.

🛠️ Can You Replace a Capacitor Yourself?

Technically? Maybe. Should you? Absolutely not. Capacitors store high-voltage electricity even when the power is off, and can seriously injure or kill if handled incorrectly.

Leave it to the professionals at Quality Comfort Air Conditioning and Heating Inc.

When you call us:

  • We test the capacitor with professional-grade tools.
  • We inspect the rest of your system for any related damage.
  • We install the correct replacement part safely and correctly.
  • We ensure everything is up to the manufacturer's spec and local code.

📞 Call now: 321-242-2513

💰 Why Capacitor Repairs Aren’t Just "A Quick Swap"

Sure, the part may only cost $30–$60. But professional replacement includes:

  • Diagnostic testing
  • Safe installation
  • A full system check
  • Warranty protection
  • Expert advice

When you choose Quality Comfort, you're not just buying a part — you're investing in peace of mind, safety, and long-term system reliability.

🧼 Preventing Future AC Capacitor Failures

Extend the life of your capacitor and system with regular maintenance:

  • 🌀 Clean or replace air filters every 30–90 days
  • 🌴 Keep the outdoor unit clear of debris, leaves, and grass
  • 🔍 Schedule annual system checkups with Quality Comfort
  • 🌡️ Keep an eye out for early signs like humming, weak airflow, or high bills

Our Maintenance Plans are designed to catch capacitor issues early, before you’re left sweating it out in the Florida heat.

❓ AC Capacitor FAQs

💡 What does an AC capacitor actually do?

It provides the electrical boost to start and run your AC’s compressor and fan motors.

💡 Can a bad capacitor cause warm air?

Yes. Without the initial jolt from the capacitor, the compressor won’t run, and your system can’t cool.

💡 How long do AC capacitors last?

Typically 5–10 years, depending on climate, usage, and system care.

💡 What’s the risk of DIY replacement?

High voltage = high danger. Improper handling can cause electrocution, system damage, or fire. Always hire a professional.

💡 Is capacitor failure common in Florida?

Yes. Florida’s heat and humidity are especially hard on capacitors. Regular maintenance is key.

🧊 Quality Comfort Keeps You Cool & Protected

At Quality Comfort Air Conditioning and Heating Inc., we know that something as small as a capacitor can cause major discomfort. That’s why we respond fast, diagnose accurately, and stand behind our work with trusted service and honest recommendations.

✅ Over 700 5-star Google reviews


✅ Serving West Melbourne, Palm Bay, Viera, Cocoa Beach, Rockledge, and all of Brevard County


✅ Family-owned, Florida-trusted since 2005

📞 Call 321-242-2513


🌐 Visit qualitycomfortfl.com


📍 Book your appointment today

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