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Why do my lights flicker when the AC kicks on?

By Bob Millaway, South Jersey Community Expert & REALTOR®

When your AC compressor starts, it draws a large surge of power. If the circuit is shared with lighting, that sudden draw can briefly drop the voltage and cause lights to dim or flicker. This is often normal for older homes. However, persistent or severe flickering could mean an undersized circuit, loose wiring, or an aging AC unit that needs service.

Why It Matters

While occasional flickering may be harmless, persistent problems can indicate electrical issues that need professional attention to prevent damage or fire risk.

Related Questions

When should I call an electrician? What is a home electrical panel and when should it be upgraded? Why do my lights flicker when the AC turns on? What are GFCI and AFCI outlets and where do I need them? Can I do my own electrical work?

Need Professional Help?

Bob recommends reaching out to a trusted local professional.

Electrical Professionals Electrical

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