Post-Storm HVAC Checklist for DMV Homeowners

Before doing anything with your HVAC system after a severe storm, check for obvious hazards: downed power lines near your home or outdoor unit, gas leaks (rotten egg smell), standing water near electrical components, and structural damage to the area around your HVAC equipment. If you smell gas, evacuate immediately and call Washington Gas emergency line (844-927-4427) from outside. If power lines are down near your outdoor unit, stay at least 35 feet away and call your utility company (Dominion Energy, Pepco, or BGE). Do not attempt to operate any HVAC equipment until obvious hazards are resolved. Check your electrical panel for tripped breakers. Power surges during storms commonly trip HVAC breakers. If the breaker trips again immediately after resetting, do not keep resetting it—this indicates an electrical fault that requires professional assessment.

After the storm has passed, inspect your outdoor condenser unit. Look for debris (branches, leaves, siding) lodged in or against the unit. Remove any loose debris by hand, but don't attempt to straighten bent condenser fins yourself—this requires a fin comb and gentle technique to avoid further damage. Check that the outdoor unit is still level on its pad. Flooding or soil erosion during heavy rains can shift the concrete pad, causing the unit to tilt. A tilted compressor doesn't lubricate properly and will fail prematurely. If the unit has shifted, have it professionally leveled before operating. Look for standing water around the outdoor unit base. After heavy rains common in DMV summer storms, water pooling around the condenser can corrode electrical connections and the base of the unit. Improve drainage around the pad to prevent recurring water issues.

Inside, check for water intrusion around your HVAC equipment, especially if it's in the basement. DMV summer storms can overwhelm drainage systems, and even minor basement flooding can damage furnace controls, blower motors, and ductwork connections at floor level. Inspect visible ductwork for damage, disconnections, or water staining. In attics, check that the roof hasn't leaked onto ductwork or the air handler. Water-damaged duct insulation becomes a mold breeding ground in the DMV's humidity and should be replaced promptly. Change your air filter after any storm that involved significant dust, pollen disruption, or debris. Storms stir up enormous amounts of particulate matter that gets pulled into your system. A fresh filter prevents this storm-generated debris from circulating through your home.

Call a professional immediately if: your system won't start after the storm, you hear new unusual noises (grinding, banging, or squealing), the system runs but produces no heating or cooling, you see ice forming on the outdoor unit or refrigerant lines, or there's any evidence of water damage to the equipment. Power surge damage may not be immediately obvious. If your system runs but behaves erratically—short cycling, displaying error codes, or not responding to thermostat changes—the control board or other electronic components may have suffered surge damage. These issues tend to worsen over time if not addressed. For comprehensive post-storm assessment, consider scheduling a full system inspection. Our technicians can evaluate ductwork connections, check for storm-related damage throughout the system, and clean any debris that entered through vents or the outdoor unit during the storm.