After the Snowstorm: Hidden HVAC/R Issues Facilities Often Miss

When a snowstorm passes and operations resume, most facilities focus on access roads, walkways, and interior comfort. But some of the most damaging impacts of winter weather happen out of sight—on rooftops, inside mechanical rooms, and within refrigeration systems.

Snow, ice, wind, and freezing temperatures can quietly compromise HVAC and refrigeration equipment, leading to failures days or even weeks after the storm. Knowing what to check after the snow clears can help prevent costly downtime and emergency repairs.

1. Snow and Ice Restricting Airflow

Even when rooftop units appear clear, snow drifts and ice buildup can remain hidden around intakes, coils, and louvers.

Risks include:

• Reduced airflow
• High-pressure shutdowns
• Inefficient heating or cooling
• Accelerated component wear

What to do:
Inspect all sides of rooftop units and clear snow and ice beyond just the visible surfaces. Proper clearance around equipment is critical for safe operation.

2. Ice-Damaged Coils and Fins

Heavy snow and refreezing meltwater can bend or damage condenser and evaporator coil fins. These issues often go unnoticed until performance drops.

Warning signs:

• Rising energy use
• Longer runtimes
• Inconsistent temperatures

Recommendation:
Schedule a post-storm inspection to check coil condition and airflow paths.

3. Blocked or Frozen Drain Lines

Snow melt followed by freezing temperatures can clog or freeze condensate drains.

Potential consequences:

• Water leaks into the building
• Ice buildup inside units
• Premature shutdowns

Best practice:
Verify that drain pans and lines are clear and properly heated where required.

4. Sensor and Control Issues

Extreme cold, moisture intrusion, and ice accumulation can impact sensors, controls, and wiring.

Common issues include:

• Faulty temperature readings
• Frozen economizer components
• Intermittent alarms or nuisance trips

These problems often surface days after the storm, once systems return to normal operation.

5. Refrigeration System Impacts

Industrial and commercial refrigeration systems are especially sensitive to changing ambient conditions after storms.

Watch for:

• Head pressure control issues
• Improper defrost cycles
• Compressor short cycling
• Temperature alarms

Post-storm adjustments may be necessary to maintain stability.

6. Roof and Structural Effects on Equipment

Snow load, drifting, and ice dams can affect roof integrity and equipment curbs.

Check for:

• Shifting equipment
• Damaged flashing
• Standing water after thaw cycles
• Unsafe access paths for service

Ignoring these conditions can lead to long-term damage or safety hazards.

7. Deferred Issues That Appear Later

Some storm-related issues don’t cause immediate failures—but worsen over time.

These include:

• Accelerated belt wear
• Bearing fatigue
• Electrical corrosion
• Reduced insulation effectiveness

A post-storm check helps catch these issues early.

How Northstar Refrigeration Can Help After Severe Weather

Northstar supports facilities before, during, and after winter storms with:

• Post-storm HVAC and refrigeration inspections
• Rooftop unit evaluations
• Refrigeration system performance checks
• Preventive maintenance adjustments
• Spare parts support to minimize downtime
• 24/7 emergency service when issues arise

📞 Call (508) 888-3692
📧 Email sales@northstarhvacr.com for service or spare parts support

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