Before and After the Storm: How to Protect Your HVAC System on the Northshore

Southeast Louisiana doesn't get gentle weather. Between tropical storms, Gulf hurricanes, and the severe thunderstorms that roll through Tangipahoa and Livingston parishes, HVAC systems on the Northshore take a real beating during storm season. A few deliberate steps before and after a major weather event can mean the difference between a system that starts right back up and one that needs a costly repair — or a full replacement.

Before the Storm Arrives

Shut the system off at the thermostat and the breaker

This is the most important step you can take. Power surges are common during storms, and a system that's running when a surge hits can suffer serious damage to the compressor or control board. Turn the system off at the thermostat first, then cut power at the dedicated breaker in your electrical panel. Even if you have a whole-home surge protector, this is still a smart precaution.

Clear debris from around the outdoor unit

Walk around your condenser — the outdoor cabinet — and remove anything that could become a projectile or clog the unit: branches, lawn furniture, potted plants, loose gravel. Condensers pull air through the coil fins, and packed-in debris after high winds reduces airflow and strains the system the next time you run it.

Photograph the unit's condition

A quick photo of your outdoor unit and refrigerant lines before the storm gives you a clear baseline if you need to file an insurance claim afterward. Takes two minutes and has saved homeowners real money.

Cover carefully — or don't

Some homeowners cover the outdoor unit with a tarp or plywood to shield it from flying debris. If you do this, make sure the covering is well-secured and remove it immediately once the storm passes — leaving a unit covered traps moisture and creates conditions for mold and corrosion. And never run the system while it's covered.

During the Storm

Leave the system off. That's it. Even if the power holds, running the AC through a major storm risks surge damage. If flooding reaches the area around your indoor air handler, you want the system completely de-energized before water contacts any electrical component.

After the Storm: Inspect Before You Restart

This is where many homeowners make a costly mistake — they flip the breaker and start the AC without checking anything first. Before you restart:

Check the outdoor unit for visible damage

Look for bent or crushed fins, impact dents, dislodged refrigerant lines, or standing water inside the housing. Lightly bent fins can sometimes be combed back out, but if something heavy clearly struck the unit or the housing is deformed, call a technician before running it.

Check for flooding around the air handler

If the indoor unit sits on the ground or in a mechanical room that took on water, do not restart the system. Flooding can damage electrical components, contaminate the blower and coil, and create conditions for mold growth inside the cabinet. That situation calls for a professional inspection before power is restored to the unit.

Check for tripped breakers or burned smells

Before starting the HVAC, look at your panel. A tripped breaker may have done its job protecting the system during a surge — understand why before resetting it. If you smell burning plastic or see any scorching around the unit or wiring, shut everything down and call for service.

Watch the first cycle

Once you're satisfied everything looks intact, restart at the thermostat and watch the system run for 10–15 minutes. Listen for rattling, grinding, or hissing. Check that cool air is actually reaching your vents. If anything seems off compared to before the storm, shut it down and have a technician take a look.

Storm Damage Isn't Always Immediate

Surge damage to a compressor or control board doesn't always show up right away. A system can appear to run fine after a storm and then fail a few days later. If your AC is running longer cycles than usual, not cooling as well, or short-cycling in a way it didn't before — that's worth investigating before a smaller problem becomes a complete breakdown.

Homes in lower-lying areas like Hammond, Denham Springs, Walker, and Livingston that sit near drainage corridors carry extra flooding risk around ground-level air handlers. If you're in one of those areas, a post-storm walkthrough is worth the extra attention.

How BCS Mechanical Can Help After a Storm

If you're not certain your system came through a storm without damage, a professional inspection before running it hard through the remaining heat of the season is the right call. BCS Mechanical provides AC repair and system inspections for homeowners throughout Hammond, Ponchatoula, Denham Springs, Covington, Mandeville, Slidell, Walker, and across the Northshore.

See our services to learn what we cover, or contact us to schedule a post-storm inspection. You can also reach us directly at (985) 474-1746 — we're here Monday through Saturday.