If your home or business lost power, experienced flooding, or took storm damage over the past several days, your heating and cooling system deserves a careful look before you fire it back up. Running a damaged or compromised HVAC system can turn a manageable storm recovery situation into a costly equipment failure — or in the case of gas-fired systems, a genuine safety concern.

This checklist covers what Indiana homeowners and business owners should inspect after a major storm, what warning signs to watch for, and when to call a professional rather than attempt to restart a system on your own.

Why Storms Are Hard on HVAC Systems

Most people think about HVAC damage in terms of obvious physical destruction — a tree branch through a condenser unit, visible flooding in a mechanical room. But storm-related HVAC damage is frequently more subtle than that, and the consequences of missing it are often worse.

Power surges during outage restoration are one of the leading causes of HVAC equipment damage following a storm. When utility power comes back online after an extended outage, it frequently comes back with voltage irregularities that control boards, capacitors, and compressors are not designed to handle. This is especially common in areas that lost power for extended periods — which applies to large parts of Lake and Porter County following recent storm activity.

Flooding introduces moisture into electrical components, ductwork, and air handling systems. Even a few inches of standing water in a basement mechanical room can compromise a furnace control board, corrode electrical connections, and create mold conditions inside ductwork that become an indoor air quality problem weeks or months after the original storm.

Wind damage to outdoor condenser and heat pump units — broken fins, debris impact, and refrigerant line stress — is visible but not always immediately obvious. A unit that appears intact from a distance may have sustained enough fin damage to reduce efficiency or enough refrigerant line stress to develop a slow leak.

The Post-Storm HVAC Checklist

Work through this checklist before restarting any HVAC equipment following a major storm. If you encounter any of the conditions noted below, do not restart the system — contact Earl’s Heating for a professional assessment first.

Step 1 — Check for Visible Physical Damage Before Touching Anything

Walk the exterior of your home or building and visually inspect all HVAC equipment:

• Outdoor condenser or heat pump unit: Look for bent or crushed fins, debris impact damage, standing water inside the unit cabinet, dislodged refrigerant lines, or the unit having shifted off its pad or mounting surface. A unit that has shifted significantly may have stressed refrigerant lines enough to cause a leak.
• Roof-mounted commercial units: If your business has rooftop HVAC equipment, have a qualified technician inspect before restart — do not attempt to access rooftop units without proper safety equipment.
• Exhaust vents and flue pipes: Check that all exhaust vents and flue pipes on the exterior of the building are clear of debris, undamaged, and properly connected. A blocked or damaged flue on a gas furnace creates a carbon monoxide hazard.
• Electrical disconnects: Confirm that the electrical disconnect at the outdoor unit is undamaged and dry before attempting to restore power to the system.

Step 2 — Assess Flooding and Water Intrusion

Water and HVAC equipment are a dangerous combination. Before restarting any system:

• Check the mechanical room or utility area for any signs of flooding or standing water. If your furnace, air handler, or boiler sat in standing water — even temporarily — do not restart it without a professional inspection. Control boards, ignition systems, and electrical connections that have been submerged require hands-on evaluation before being returned to service.
• Check the furnace air filter. A filter that has been exposed to moisture or debris-laden air during a storm should be replaced before restarting the system. A wet filter restricts airflow and can introduce mold into the air handling system.
• Inspect accessible ductwork for signs of water intrusion. Standing water in ductwork creates mold conditions quickly and needs to be addressed before the system is run — running air through wet ductwork distributes mold spores throughout the building.
• Commercial buildings with basement mechanical rooms are particularly vulnerable to storm flooding. If your commercial HVAC equipment was exposed to floodwater, treat the entire system as compromised until a professional assessment confirms it is safe to restart.

Step 3 — Check Electrical Components and Power Restoration

Extended power outages followed by power restoration are a significant HVAC risk:

• Do not immediately restart HVAC equipment when power is restored after an extended outage. Wait at least 30 minutes after power returns before attempting to restart air conditioning or heat pump systems. This allows the crankcase heater — a small heating element that protects the compressor by keeping refrigerant oil warm — time to warm up before the compressor is called to run.
• Check your electrical panel for tripped breakers related to HVAC circuits. A tripped breaker on an HVAC circuit after a storm should be investigated — not simply reset. A breaker that tripped during the storm may have done so for a reason, and resetting it without understanding why can damage the equipment.
• Look for signs of surge damage. If any electronics in your home or business were damaged by power surges during the storm — flickering displays, devices that won’t power on — your HVAC control board may have sustained similar damage even if the system appears to start normally. Surge-damaged control boards often fail days or weeks after the initial event rather than immediately.
• Whole-home and commercial surge protection is one of the most effective ways to protect HVAC systems from power restoration damage. Earl’s Heating recommends discussing surge protection with your HVAC technician during your next service call.

Step 4 — Restart Carefully and Monitor Performance

If your visual inspection did not reveal any of the concerning conditions above, you can attempt a careful restart:

• For air conditioning systems: Set the thermostat to cooling mode and lower the setpoint by a few degrees. Listen for unusual sounds during startup — rattling, grinding, or banging that wasn’t present before the storm. Check that cool air is reaching all registers within a few minutes of startup.
• For gas furnaces: Set the thermostat to heating mode and confirm the system ignites and produces heat normally. Any unusual odors — particularly a sulfur or burning smell — should prompt an immediate shutdown and a call to Earl’s Heating.
• For commercial systems: Restart rooftop and split systems one zone at a time rather than all at once. This reduces the electrical load surge on restoration and gives you the ability to isolate any zone that behaves abnormally during restart.
• Monitor for the first 30-60 minutes after restart. An HVAC system that appears to start normally but develops unusual behavior within the first hour of operation may have sustained damage that isn’t immediately obvious.

Step 5 — Schedule a Post-Storm Professional Inspection

Even if your system appears to be running normally after a storm, a professional inspection is worthwhile following any significant storm event — particularly one that involved extended power outages, flooding, or direct physical impact near HVAC equipment.

Earl’s Heating provides post-storm HVAC inspections for residential and commercial customers throughout Lake and Porter County. Our technicians evaluate:

• Refrigerant levels and line integrity on cooling systems
• Combustion safety and carbon monoxide testing on gas-fired heating systems
• Electrical component condition including control boards, capacitors, and contactors
• Ductwork condition and air quality assessment in flood-affected properties
• Overall system performance vs. pre-storm baseline

Catching storm-related damage early — before it develops into a full system failure — is almost always less expensive than addressing the same issue after the equipment has been run for weeks in a compromised condition.

When to Call Earl’s Heating Immediately

Do not attempt to restart your HVAC system and call Earl’s Heating right away if:

• Your outdoor unit was submerged, shifted off its pad, or sustained visible impact damage
• Your furnace, air handler, or boiler sat in standing water
• You smell gas near any HVAC equipment
• Your carbon monoxide detector activated during or after the storm
• You hear grinding, banging, or other unusual sounds during a restart attempt
• Your system starts but fails to produce heating or cooling within a few minutes
• A breaker associated with HVAC equipment has tripped and will not hold when reset

Earl’s Heating Is Here for Northwestern Indiana

Earl’s Heating has been serving residential and commercial customers across Lake and Porter County — including Schererville, Merrillville, Crown Point, Valparaiso, Portage, Hobart, Hammond, Gary, Michigan City, Saint John, Munster, Dyer, and surrounding communities — through every kind of weather the region produces.

Following the recent storm activity across northwestern Indiana, our team is ready to help homeowners and businesses assess storm-related HVAC damage, perform post-storm inspections, and get heating and cooling systems back to safe, reliable operation. We offer straightforward pricing, the latest diagnostic technology, and financing options for customers who need repair or replacement work following storm damage.

If your home or business HVAC system was affected by recent storms, contact Earl’s Heating to schedule a post-storm inspection. Do not wait until your system fails — proactive assessment after a significant storm is the fastest path back to comfort and safety for your family or your team.

Call Earl’s Heating today or visit earlsheating.com to schedule your post-storm HVAC inspection.

Frequently Asked Questions About How Storms Impact HVAC Systems Across Northwest Indiana

Q: Is it safe to run my air conditioner or furnace after a storm?

A: It depends on what the storm involved. If your equipment sustained flooding, visible physical damage, or was exposed to power surges during a lengthy outage, do not restart it without a professional inspection first. If your equipment appears undamaged and your power was only briefly interrupted, a careful restart following the checklist above is reasonable — but monitor the system closely for the first hour of operation and contact Earl’s Heating if anything seems abnormal.

Q: How do I know if my HVAC system was damaged by a power surge?

A: Surge damage to HVAC control boards is not always immediately obvious. Signs include the system failing to respond to thermostat commands, error codes on the thermostat or air handler display, the system starting but failing to complete a heating or cooling cycle, or unusual electrical smells near the air handler or furnace. If other electronics in your home or business were visibly affected by surges during the storm, have your HVAC system professionally inspected even if it appears to be starting normally — control board surge damage frequently presents as intermittent failures rather than immediate non-function.

Q: Does Earl’s Heating serve commercial properties for post-storm HVAC inspection?

A: Yes. Earl’s Heating provides post-storm HVAC inspection and repair services for commercial properties throughout Lake and Porter County, Indiana. Commercial HVAC systems — including rooftop units, split systems, and multi-zone configurations — have specific post-storm inspection requirements that differ from residential systems. Earl’s Heating technicians are experienced with both residential and commercial equipment and can assess storm-related damage across all system types. Contact Earl’s Heating to schedule a commercial post-storm inspection.

Q: My power just came back on — should I turn my AC on right away?

A: Wait at least 30 minutes after power is restored before restarting air conditioning or heat pump systems. This allows the crankcase heater — which protects the compressor — time to warm up before the compressor runs. Starting a compressor immediately after an extended power outage without this warmup period can cause compressor damage, particularly in hot weather when refrigerant migration into the compressor oil is more likely. After the 30-minute wait, restart carefully and monitor performance for the first hour.

Q: Do you offer emergency commercial AC repair in Northwest Indiana?

A: Yes. Earl’s Heating & Air provides emergency commercial AC service across Northwest Indiana including Lake, Porter, LaPorte, and Jasper Counties. We understand that a residential or commercial system failure during storm season is not something that can wait. Contact us directly for urgent service needs and we will dispatch a technician as quickly as possible.

Earl’s Heating & Air — Northwest Indiana’s Commercial HVAC Specialists. Serving Lake, Porter, LaPorte, and Jasper Counties.