Summer in Aurora and the surrounding Fox Valley brings plenty of sunshine, but it also brings those classic, sudden Northern Illinois thunderstorms. We’ve all experienced it: the sky turns dark, the wind picks up, the lightning flashes, and suddenly—the power blinks out.
While most homeowners know to plug their computers and TVs into surge protectors, very few think about the most expensive electrical appliance they own: their air conditioner.
When severe summer weather hits, your AC is right on the front lines. Here is what happens to your system during a storm, and how you can protect your investment this summer.
The Hidden Threat: Power Surges and Undervoltage
Lightning strikes don’t have to hit your house directly to cause damage. A strike near local power lines can send a massive spike of electricity through the grid and straight into your home.
While a massive surge can instantly fry an AC compressor, smaller, frequent “mini-surges”—or even the voltage drops (brownouts) that happen when the grid struggles during a storm—are just as dangerous. They degrade the delicate electrical components and capacitors inside your outdoor unit over time, leading to unexpected failures right in the middle of a July heatwave.
4 Steps to Take During and After a Severe Aurora Storm
If a major storm is rolling through the Fox Valley, follow these quick steps to keep your cooling system safe:
- Turn it off before the storm hits: If severe weather or high winds are forecasted, consider bumping your thermostat up a few degrees or turning the system off temporarily. If the power starts flickering, turn it off immediately at the thermostat to prevent the compressor from short-cycling when the power rapidly cuts in and out.
- Check for outdoor debris: Once the storm passes and it’s safe to go outside, take a quick peek at your outdoor condenser unit. High winds can blast wet leaves, twigs, or fallen branches against the aluminum fins, restricting airflow and causing the system to overheat.
- Wait before restarting: If your power goes completely out and then kicks back on, don’t rush to crank the AC back down. Give the local power grid a few minutes to stabilize. Furthermore, most modern AC units have a built-in time delay (usually about 5 minutes) to protect the compressor from starting under high pressure.
- Know the signs of damage: If your power is back on but your AC is only blowing warm air, making a strange humming or clicking sound, or tripping your indoor circuit breaker, do not keep trying to run it. These are classic signs of electrical damage or a failed capacitor.
Proactive Protection: HVAC Surge Protectors
You can’t control the Midwestern weather, but you can control how prepared your home is. One of the best ways to get peace of mind all summer long is by installing a dedicated HVAC surge protector.
Mounted right at the outdoor disconnect box, these commercial-grade devices act as a shield, absorbing dangerous electrical spikes before they can ever reach your expensive compressor and fan motor. It’s a simple, cost-effective upgrade that can save you thousands of dollars in emergency replacement costs.
Stay Cool, Stay Safe
If a recent Fox Valley storm has left your air conditioner acting strange, or if you want to talk about adding surge protection to your system before the next round of weather hits, give our local team a call. We’ve been keeping Aurora comfortable through every season, rain or shine! If you suspect storm damage has already impacted your system, schedule your Aurora AC repair with us today to ensure your cooling holds up all summer long.