And why ignoring it can cost you a system failure.
Your HVAC system relies on many small components to operate smoothly—but one of the most important (and most overlooked) is the capacitor. This tiny part plays a big role in starting the motors for your air conditioner, furnace, or heat pump. When it fails, your system won’t start—or worse, it could suffer damage trying.
At Jack Frost Heating and Air Conditioning, we often get emergency calls for AC not working or unit won’t turn on, only to find a worn-out capacitor is the culprit.
⚡ What Does an HVAC Capacitor Do?
A capacitor stores and releases electrical energy to help the compressor and fan motors start and run efficiently. Your system may have:
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A start capacitor to help get the motor running
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A run capacitor to keep it going smoothly
🕒 So, How Often Should You Replace It?
Every 5–7 years is typical—but don’t wait for it to fail. Capacitors degrade over time, especially in regions like Tennessee, where heat, humidity, and voltage fluctuations can wear them out faster.
🚨 Signs Your Capacitor Is Failing
- AC is running but not blowing cold air
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HVAC system won’t turn on
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You hear humming from the unit but no action
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The breaker keeps tripping
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A bulging or leaking capacitor (visible on inspection)
If your unit isn’t starting or is struggling to run, you could end up needing emergency air conditioner repair or even damage your compressor—one of the most expensive parts to replace.
🔧 Why Preventative Replacement Makes Sense
Replacing a capacitor during routine maintenance is inexpensive and protects your system from bigger, costlier problems. Our techs always test your capacitor’s performance during tune-ups and can advise you if it’s weakening.
✅ Trust Jack Frost for Reliable HVAC Maintenance
At Jack Frost Heating and Air Conditioning, we check capacitors on every seasonal inspection to help prevent surprise breakdowns. Whether your system needs a small repair or a full diagnostic, we’ve got you covered.
📞 Call us today at 865-573-5777 or schedule an appointment online at
🌐 www.jackfrostheatingandair.com