Why Do Lights Flicker When AC Turns On?: 1 Minute to Understand the Cause of Flickering Lights

If you’ve ever noticed your lights flicker when your air conditioning (AC) kicks on, you’re not alone. Many homeowners experience this peculiar event, and it can be concerning. Understanding why this happens can alleviate your worries and help you address any potential issues with your electrical system.

The primary cause of flickering lights when the AC turns on is related to the demand for electricity. Air conditioners require a significant amount of power to start up, often more than during regular operation. This sudden surge of electricity can temporarily lower the voltage in your electrical system, leading to the flickering of lights.

Another reason your lights may flicker is due to a weak connection in the wiring or an overloaded circuit. If the circuit that supplies power to your AC and lights is overloaded, the lights might flicker whenever the AC tries to draw more current. In older homes, wiring may also not be able to handle the increased demand, resulting in noticeable flickering.

Is Flickering a Cause for Concern?

While occasional flickering from your lights when the AC turns on can be normal, frequent or severe flickering may indicate a deeper problem. It’s essential to monitor the situation. If you find that the flickering persists or worsens, it might be time to consult with an electrician.

Improperly installed or worn-out wiring, issues with your electrical panel, or even faulty light fixtures can all contribute to more significant issues if left unchecked. Ignoring these signs can lead to electrical fires or further damage to your system.

What Can You Do?

Here are a few steps you can take to prevent lights from flickering when your AC turns on:

Ensure your AC system is properly sized for your home. An oversized unit can create larger demand spikes.

Have a qualified electrician check your electrical panel and wiring, especially in older homes.

Consider installing dedicated circuits for your AC and other large appliances, reducing the load on shared circuits.

FAQ

Q: Is it normal for lights to flicker when my AC turns on?A: Some flickering is normal due to the surge of electricity when the AC starts, but excessive flickering indicates a potential issue that should be investigated.

Q: What should I do if my lights flicker too much?A: If flickering is frequent, consult with an electrician to identify and resolve any underlying electrical issues.