Why Lights Flicker in Sarasota Homes During Storms or Heavy AC Use | CoHarbor Electric

There are two times of year we get the most flickering-light calls in Sarasota, and they’re almost opposite conditions — right after a summer storm rolls through, and during the stretch of August when the AC basically never shuts off. Different triggers, but a lot of the time, the same underlying cause. We figured it was worth laying out why these two situations produce the same symptom, because the explanation actually helps homeowners know which one they’re dealing with.

This is a residential-focused breakdown — if you’re managing a commercial property and dealing with flickering or power drops there, the causes and code requirements are a different conversation, and we’ve written about that separately. For homes, though, the pattern is pretty consistent once you’ve seen it enough times.

Storm-Triggered Flickering

Voltage Fluctuation During Outage Recovery

When FPL is restoring power across Sarasota after a storm, especially after multiple sections of the grid have gone down, the power doesn’t always come back evenly. Different circuits re-energize at slightly different times, and during that window homes can see voltage sag or brief spikes that show up as flickering throughout the house. Usually this settles down within a day once the grid stabilizes, but if it doesn’t, that’s a sign something downstream — inside the home, not on the utility side — got affected.

Surge Damage That Doesn’t Show Up Immediately

We had a service call last storm season out near Gulf Gate where a homeowner said her hallway lights had been flickering “on and off” for about two weeks after a storm, and she’d assumed it would just go away. It didn’t. Turned out a near-miss lightning strike had damaged a connection at her main panel that wasn’t bad enough to cause an outright failure, just bad enough to cause intermittent flicker under certain loads. That’s a pretty common pattern — storm damage that’s subtle enough to live with for a while before it becomes something more serious.

Loose Connections From Wind and Vibration

High wind events can physically loosen connections at the meter base or service entrance, especially on older homes where those connections haven’t been checked in years. A loose connection there doesn’t always cause an outright loss of power — sometimes it just causes intermittent resistance that shows up as flicker, particularly when larger loads like the AC or a pool pump kick on and pull more current through that same weakened connection point.

AC-Driven Flickering

Voltage Drop on Startup

This is the one that confuses people the most because it feels backwards — the lights flicker when the AC turns on, not when something’s broken. To some degree, a brief flicker on AC startup is actually normal. Compressors draw a surge of current when they kick on, more than they draw during steady operation, and that brief draw can cause a quick voltage dip on the circuit. A flicker that lasts a second and happens consistently every time the AC cycles on usually isn’t an emergency.

When It’s More Than Normal Startup Flicker

Where it crosses from normal to a problem is frequency and severity. If the flicker is noticeably worse than it used to be, if it’s happening across more rooms than before, or if it’s accompanied by a dimming that lasts several seconds instead of a quick blink, that points to something else going on — usually a connection somewhere between the panel and the AC circuit that’s degraded enough to cause more voltage drop than it should under that load.

Undersized or Aging Circuits for Newer AC Units

We see this a fair amount in Sarasota homes where the AC system’s been upgraded over the years but the electrical circuit feeding it never was. A higher-efficiency unit installed ten years after the home was built doesn’t always draw the same current characteristics as the original unit, and a circuit that was adequate for the old system can end up working harder than it should for the new one. Flickering during AC cycles is often the first visible sign of that mismatch.

Common Mistakes Homeowners Make With This

The biggest one is assuming all flicker is the same and either ignoring it entirely or panicking over something genuinely minor. A brief flicker exactly when the AC kicks on, every single time, with no other symptoms, usually isn’t worth an emergency call. Flickering that’s irregular, that’s gotten worse over weeks, or that started after a storm and hasn’t resolved on its own — that’s the kind worth having looked at.

Another common one is replacing bulbs or dimmer switches as a first move without checking whether the cause is upstream. We get it — it’s the easiest thing to try. But if the flicker is happening across multiple fixtures on the same circuit, the bulb usually isn’t the problem.

What We Check During a Diagnosis

When we get called out for flickering in Sarasota, we’re checking the panel first — looking for heat discoloration, loose lugs, or signs of arcing, particularly on the circuits tied to whichever symptom prompted the call. We check the connection at the meter base, since that’s a common point for storm-related loosening. We test voltage under load, comparing what happens when the AC or another major appliance cycles on versus the resting state. NEC requirements around AFCI protection on living-area circuits exist specifically to catch intermittent arcing like this before it progresses into something more serious, so part of our check is confirming a home’s protection actually meets that standard, especially in homes built before those requirements were in place.

If the issue traces back to the panel itself, that’s a bigger conversation than a flicker repair — we’ve covered panel upgrade costs and timelines for Sarasota homes in more detail separately, and it’s worth a look if your panel’s original to an older home.

Get the Real Cause Diagnosed, Not Just Patched

Flickering lights during a storm or a hot AC cycle can mean almost nothing, or it can mean a connection somewhere in your system is quietly degrading. The only real way to know the difference is having someone actually test it rather than guessing from the symptom alone.

Coharbor Electric is licensed and insured, and we’ve diagnosed this exact issue in homes all over Sarasota, from Gulf Gate to Lakewood Ranch to the neighborhoods closer to Siesta Key, where storm exposure and salt air both come into play. If your lights have been flickering more than usual, give Coharbor Electric a call and we’ll find out what’s actually causing it.