My Lights Flicker When I Use My HVAC. Should I Be Concerned?

Most things in your home run on electricity—from charging your electronics to keeping the temperature inside where you want it. That’s why it’s infuriating when electricity in our homes doesn’t work the way we anticipate. For many homeowners, this stress can come to a head when lights flicker after their air conditioning or heating system starts to operate.

The question remains: Do dimming or flickering lights at the beginning of HVAC cycles signify a serious electrical problem? It varies.

When are dimming or flickering lights considered usual?

If you’re noticing dimming that lasts for a fraction of a second when your HVAC kicks in, it likely isn’t something to be stressed about.

While it might not feel like it, your home has a certain amount of electricity it can use at any given time. Large appliances—like your HVAC system—need a major amount of electricity to start up. When those appliances turn on, they take a larger amount of the available electricity. This means the other appliances in your home, like your lights, have less power available to them.

If this is the lone issue you are facing, your lights should dim for less than a second and quickly return to full brightness. If you’re irritated by the flickering, schedule an appointment with Winters Heating and Cooling. We’ll review your system and see if an equipment upgrade or circuit changes can alleviate the problem.

When should I be concerned about flickering lights?

Flickering lights can also indicate a more serious matter. Don’t try to figure this out by yourself. The problem could be unsafe for you or your home. Reach out to a professional if you experience:

• Lights that continue to flicker. The normal flickering that occurs when there isn’t enough power to keep up with all appliances in your home should last a fraction of a second. If your lights continue to flicker on and off when you start your HVAC system—or continually at any other time—you could have a challenge with your wiring.
• Lights that dim drastically. When you experience usual dimming, the effect is enough that you notice a small, brief change. If the intensity of your lights abruptly drops considerably, you could have something wrong with the outdoor compressor on your air conditioner.
• A circuit breaker trip when you turn on your HVAC. Circuit breakers are a key part of your home’s electrical system. When they trip and shut off power to a part of your house (powered by a specific circuit), they are attempting to protect you from a concern with your circuit. While it could be that you have too many appliances on the same circuit, it’s smart to bring a professional in to confirm there isn’t a more serious problem.

Any time your HVAC system and lights don’t work together, it’s not a bad idea to call a professional in to take a look. The team at Winters Heating and Cooling is here to provide support. When you need us, you can give us a call at 317-406-5382 or arrange an appointment online. We’ll make sure everything is in order so your household can feel safe in your home.