Why Lights Flicker When the AC Comes On

It can be concerning when your lights flicker as your AC turns on. In some cases, this behavior is normal. However, in other situations, it could be cause for concern and involves contacting a professional for assistance. Understanding the difference between the two can help you make informed decisions in the best interest of your home and electrical and HVAC systems.

What Happens When an Air Conditioner Turns On

When an air conditioner turns on, it can draw a high inrush current. The brief surge of power can sometimes manifest itself as flickering lights due to a temporary voltage drop. An AC causing the lights to dim or flicker is also common in older homes, often due to outdated electrical systems.

Common Contributing Factors

Dimming or flickering lights might not be normal behavior. Depending on the situation, it may indicate electrical issues with your air conditioner or your electrical system. For example, in older homes, outdated electrical wiring may not be able to handle the current electrical load. Undersized wiring or circuits could also be problematic. Loose connections, overloaded circuits, or a failing electrical panel can also cause noticeable flickering when large appliances like your AC start up. Additionally, your HVAC system could be outdated and need to be updated promptly. These systems typically last around 15 years. If it’s approaching that age or older, then it’s time to consider replacing the unit.

Normal vs. a Problem

If the flickering lasts for a second or two when your air conditioner starts up, this isn’t necessarily cause for concern. This is particularly the case if the problem isn’t worsening over time and you don’t notice serious warning signs like burning odors. After the brief flickering, your lights remain steady, and your system operates normally.

Flickering lights become a problem if the situation changes for the worse. For example, the lights flicker for longer, or they stay dim while the air conditioner operates. Another serious indicator is if the breakers trip while you’re trying to use the system. In some cases, a failing AC compressor can draw excessive power at startup, which may cause more noticeable or worsening flickering.

When to Call a Professional

Calling one of our team members is the best course of action if the AC is causing lights to dim or flicker. If homeowners don’t have professional electrical or HVAC training, it can be challenging to know for sure what’s causing the issue. We can assess the situation, determine the cause, and recommend the next best steps. It’s important not to delay calling for professional assistance. Electrical issues can worsen over time, resulting in problems becoming more severe and costly to fix. Additionally, this could put your home at risk for a fire, especially if you have an older electrical system. Dealing with the issue quickly can give you peace of mind that your home is safe. If you notice frequent or worsening flickering, it’s important to have your system inspected as soon as possible.

Some homeowners might be tempted to try to fix electrical problems themselves. However, this could put you at serious risk for personal injury like electrical shock or electrocution. You may also accidentally cause further damage to the system. While we’re addressing the primary concern, our electricians can also keep an eye out for other issues that may not have yet become noticeable. We can help you create a plan to handle the electrical problems, which may include solutions like replacing your electrical panel or whole-home rewiring.

Get Help Right Away

Take steps today to determine why the lights flicker when your AC turns on. With more than 80 years of experience, Blind & Sons provides expert HVAC and electrical services in Northeast Ohio, backed by a 100% satisfaction guarantee.

Call us today or contact us online to schedule an appointment for HVAC or electrical repairs.