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Writer's pictureThe Electric Guy

Why Are My Lights Flickering When the AC Turns On? Unraveling the Mystery Behind the Flickering Frights!


Woman turning on the AC

When it’s blazing hot outside, your air conditioner is your best friend. You’ve got it cranked up, ready to turn your home into an icy paradise, when suddenly you notice your lights flicker every time the AC kicks on. If you’re like most people, your first thought might be, “Is my house haunted?” But before you start calling the Ghostbusters, let’s explore some more logical (and less spooky) explanations for why your lights are flickering when your AC turns on.


1. The Power Surge Effect: Your AC's Big Appetite

Air conditioners are power-hungry beasts. When your AC unit starts up, it demands a significant amount of electricity all at once. This sudden surge can cause a brief dip in the voltage that’s available to your lights, making them flicker. It’s like a traffic jam at rush hour—everyone’s trying to get on the road at the same time, causing a momentary slowdown.


2. An Overloaded Circuit: The Busy Highway

Think of your home’s electrical system as a busy highway. Your air conditioner, being a big rig, requires more space (or in this case, power) than smaller vehicles (like your lights). If your AC shares a circuit with other devices or lights, it might cause a temporary power shortage when it turns on, leading to flickering lights. This is especially common in older homes with outdated electrical systems that weren’t designed to handle today’s power-hungry appliances.


3. Inadequate Wiring: The Narrow Lane

If your home’s wiring isn’t up to par, it’s like trying to drive a semi-truck down a narrow country lane—it’s just not going to go smoothly. Inadequate wiring can’t handle the electrical load when your AC starts up, causing a voltage drop that makes your lights flicker. If your home’s wiring is older or was done on the cheap, it might be time to upgrade to a more robust system.


4. A Failing Capacitor: The Weak Battery

Your AC’s capacitor is like its battery. It stores energy that’s used to start the compressor (the heart of your AC system). If the capacitor is weak or failing, it may struggle to provide the necessary power to get the compressor going. This can cause your AC to draw more power from your home’s electrical system, leading to flickering lights. Think of it like trying to start a car with a dying battery—it might work, but it’s going to put a strain on everything else.



Wobbly wood Bridge
If the electrical connections in your home are loose or corroded, it’s like driving over a wobbly bridge—it might hold up, but it’s going to be a bumpy ride.




5. Loose or Corroded Connections: The Wobbly Bridge

Loose or corroded connections can cause intermittent voltage drops when your AC kicks on, leading to flickering lights. This is not just an annoyance; it’s a potential safety hazard, so it’s worth getting checked out by a professional.


So, What Should You Do?

First, don’t panic. While flickering lights can be annoying, they’re usually a sign of a minor issue rather than a major disaster. However, it’s always a good idea to get it checked out by a professional electrician. They can diagnose the problem and recommend the best course of action, whether it’s upgrading your wiring, fixing a loose connection, or replacing a failing capacitor.


In the meantime, you can try to ease the load on your electrical system by turning off unnecessary lights or appliances when your AC is running. This might not solve the problem entirely, but it can help reduce the strain on your system until you can get a professional to take a look.


Remember, your AC is there to keep you cool—not to give you the creeps with flickering lights. So, take a deep breath, call in the pros if needed, and enjoy the comfort of your cool, flicker-free home!

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