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

April 22, 2019

Many things in your home rely on electricity—from charging your phone 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 expect. For many homeowners, this stress can come to a head when lights flicker after their HVAC system starts to run.

The question remains: Do dimming or flickering lights at the beginning of HVAC cycles indicate a serious electrical problem? It differs depending on the situation.

When are dimming or flickering lights considered normal?

If you’re experiencing dimming that lasts for a fraction of a second when your HVAC starts, it usually isn’t something to be worried about.

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

If this is the only issue you are facing, your lights should dim for less than a second and quickly return to full brightness. If you’re tired of the flickering, schedule an appointment with Connolly Electric & Mechanical. We’ll assess the situation and see if an equipment upgrade or circuit changes can alleviate the problem.

When should I worry about flickering lights?

Flickering lights can also point to a more serious matter. Don’t investigate yourself. The problem could be hazardous for you or your home. Reach out to a professional if you experience:

  • Lights that continue to flicker. The normal flickering that happens when there isn’t enough power to accommodate 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 regularly at any other time—you could have a challenge with your wiring.
  • Lights that dim significantly. When you experience typical dimming, the effect is enough that you notice a small, brief change. If the intensity of your lights abruptly drops considerably, you may 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 section of your space (powered by a specific circuit), they are attempting to protect you from an issue with your circuit. While it could be that you have too many appliances on the same circuit, it’s wise 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 a good idea to call a professional in to take a look. The team at Connolly Electric & Mechanical is here to provide support. When you need us, you can give us a call at 928-244-8840 or make an appointment online. We’ll make sure everything is in order so your family can feel safe in your home.