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What Appliances Are Most at Risk From a Lightning Strike?

Last updated October 31, 2026

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The short answer

How a Power Surge Damages Appliances

A lightning strike near power lines can send a massive voltage spike, or surge, into your home's electrical system. This sudden jolt of electricity far exceeds what your wiring and appliances are designed to handle. The surge seeks the path of least resistance, often traveling through outlets and into any connected device. This overload can instantly melt wires, fry microchips, and ruin motors in a fraction of a second.

The damage is not always immediately obvious. An appliance might appear fine but have a compromised control board that fails days later. Sometimes, the only sign is a tripped breaker or a burning smell. The severity depends on the surge's strength and how close the strike was to your home. Even a distant strike on a utility pole can send damaging current through the grid.

High-Risk Appliances with External Connections

Appliances with connections outside your home face the greatest risk. Central air conditioning units are prime targets because their large compressors are outdoors and wired directly to your electrical panel. The surge can travel up this dedicated line, destroying the compressor and internal electronics. An outdoor unit's metal casing offers little protection against the immense energy of a direct or nearby strike.

Other vulnerable items include garage door openers with exterior wiring and security system components. Well pumps and pool equipment with long underground wiring can also act as conduits for surges. Irrigation systems and outdoor lighting may be at increased risk during seasonal thunderstorms. The key factor is any wire that bridges the gap between indoors and the outside environment.

  • Air Conditioning Units (especially the outdoor condenser)
  • Refrigerators and Freezers (complex electronics and compressors)
  • Washing Machines and Dryers (connected to water lines and vents)
  • Televisions and Home Entertainment Systems (via cable or satellite lines)
  • Computers, modems, and internet routers
  • Smart Home Hubs and Thermostats

Protecting Your Home from Electrical Surges

The most effective protection is a whole-house surge protector installed at your main electrical panel by a qualified electrician. This device intercepts large surges from the utility lines before they enter your home's wiring. It is your first and most critical line of defense. For complete protection, you should also use point-of-use surge protector strips for sensitive electronics like computers and entertainment centers.

When Lightning Causes Water Damage

A lightning strike can indirectly cause significant water damage. If a surge damages an appliance with a water line, like a refrigerator with an ice maker or a washing machine, it can cause a valve to stick open or a control board to malfunction. This can lead to a continuous, undetected leak that soaks floors and walls, often for hours before you notice.

Similarly, a damaged air conditioner's drain line or condensate pump may fail, leading to an overflow. The resulting water can damage drywall, ceilings, and flooring. If this happens, you need to stop the water source and address the moisture quickly to prevent mold. Local water damage pros can inspect the area, perform water extraction, and begin the drying process to protect your home's structure.

Steps to Take After a Suspected Surge

First, ensure it is safe. If you smell smoke or see sparks, leave the area and call emergency services. Once safe, unplug any appliances that were in use or that you suspect were affected. Do not touch electrical panels or outlets if there is standing water. Check your circuit breakers and reset any that have tripped, but if one trips again immediately, leave it off and consult an electrician.

Next, perform a visual inspection. Look for discolored outlets, buzzing sounds from appliances, or any signs of water leaking from appliances. Test major appliances one at a time. If an appliance does not power on or behaves erratically, it is likely damaged. Document everything for an insurance claim, including photos of damaged units and any visible water. Policies vary, and your insurer decides what is covered.

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Frequently asked questions

Does homeowners insurance cover lightning damage to appliances?

Most standard homeowners policies cover sudden, accidental damage from a lightning strike, including to appliances. This typically falls under "power surge" coverage. However, there may be deductibles and coverage limits. You must document the damage and file a claim. Policies vary, and your insurer decides what is covered.

Can a surge protector save my refrigerator?

A high-quality, properly installed whole-house surge protector offers the best chance to protect large appliances like refrigerators. A simple power strip is insufficient for the large surge from a lightning strike. For optimal protection, the refrigerator should be on a dedicated circuit with whole-house protection at the main electrical panel.

What should I do if water leaks from an appliance after a storm?

Immediately shut off the water supply valve to that appliance, if possible. Then, turn off the electricity to that area at the circuit breaker. Contain the water with towels and move items away. Contact local water damage pros for water extraction and drying to prevent structural damage and mold growth in your home.

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