Why do my Lights Flicker when the Air Conditioner Turns On?

It is common for lights to flicker briefly when your air conditioner turns on because the compressor motor requires a significant surge of electricity to start—typically three to five times its normal running current. This “inrush current” momentarily lowers the voltage available to other circuits in your home, causing lights to dim or flicker for a split second.

While a brief flicker is usually normal, there are specific signs that indicate a more serious issue requiring professional attention:

• Sustained Dimming: If the lights stay dimmed the entire time the air conditioner is running.
• Unusual Noises or Smells: A buzzing sound coming from your electrical service panel or a burning odor near switches and outlets.
• Frequent Issues: Noticeable flickering in older homes or properties with undersized electrical panels (such as 100-amp service) that may struggle to accommodate the draw of modern AC units.

If you notice these red flags, they may point to loose connections, undersized wiring, or an overloaded circuit. As Licensed & Insured experts with over 25 years of experience, we can perform a thorough Electrical Safety Inspection to identify the underlying cause. We provide fixed quotes before work begins and offer same-day availability to ensure your electrical system remains stable and safe.

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