What Facility Managers Should Know About Commercial HVAC Winterization

Winter may bring cooler air and lower cooling demands, but for facility managers, it’s a season that demands preparation. HVAC winterization is a critical task that keeps systems running smoothly, prevents expensive failures, and protects buildings from harsh conditions. When freezing temperatures hit, even a small oversight, like an uninsulated pipe or inactive emergency heating system, can spiral into costly downtime or damage.

Getting ahead of the cold season starts with understanding what to check, when to check it, and why it matters. Below, we’ll walk you through key winterization steps, common mistakes to avoid commercial HVAC shut downs, and how to ensure your facility is ready before the first freeze.

Why Winterization Matters

Winterization is about more than making sure the heat works. It’s a strategy to prevent damage, cut energy waste, and support continuous operations during extreme cold. For commercial and industrial buildings, especially those with sensitive equipment or tenants, the stakes are high.

Prevents Costly Failures: Frozen coils, cracked pipes, or failed heat exchangers are common problems when winterization is skipped. These issues can lead to flooding, shutdowns, and expensive emergency services.
Reduces Energy Waste: A properly winterized HVAC system doesn’t have to work as hard to keep up with temperature demands. Insulating piping, sealing air leaks, and cleaning filters all help reduce operating costs.
Extends Equipment Lifespan: Routine inspections and shutdown procedures for idle components preserve mechanical integrity. This reduces wear on your system and helps you get more years out of every unit.
Minimizes Operational Disruptions: Facilities like healthcare clinics, schools, and manufacturing plants can’t afford interruptions. HVAC winterization ensures your heating systems respond when they’re needed most.

Key HVAC Winterization Steps for Facility Managers

Winterization isn’t complicated, but it does require attention to detail and proactive planning. The following checklist outlines essential steps to complete before temperatures drop.

Drain Condensation Lines and Coils: Residual moisture in condensate lines and coils can freeze and expand, causing cracks or blockages. Drain these components fully before winter and confirm that drain lines are clear.
Inspect and Insulate Exposed Piping: Pipes running along rooftops, basements, or exterior walls are vulnerable to freezing. Add insulation sleeves where needed and check for signs of wear on existing insulation.
Shut Down or Prep Idle Cooling Equipment: Chillers, rooftop AC units, or split systems that won’t be used during winter should be shut down properly. Cover rooftop units to protect them from ice, debris, and wind damage.
Test Emergency Heating Systems: Backup systems like electric heat strips or emergency boilers need to be tested before they’re actually needed. Confirm they engage correctly and have adequate fuel or electrical supply.
Inspect Thermostats and Building Controls: Calibration errors or faulty sensors can result in uneven heating or overuse of system resources. Test each thermostat, verify zone performance, and update programmable settings for winter schedules.
Seal Ducts and the Building Envelope: Leaks in ducts or exterior walls let cold air infiltrate and reduce heating efficiency. Seal gaps with mastic or tape, and inspect doors and windows for drafts or poor seals.
Check and Replace Air Filters: Dirty filters force the HVAC system to work harder, especially when air density increases in colder weather. Replace filters to ensure clean airflow and optimal performance.
Review HVAC Schedules for Seasonal Use: Update your building automation system to match occupancy patterns. Many buildings don’t need full heating 24/7. Adjusting these schedules can cut energy waste significantly.

A&G Services offers full-service HVAC winterization designed to protect your commercial building, reduce emergency repairs, and improve overall system performance. Explore more.

HVAC Preventative Maintenance

Common Mistakes to Avoid When Winterizing HVACs

Even experienced facility managers can overlook key parts of HVAC winterization. Awareness of these common errors can help you avoid serious problems later on.

Skipping Pipe Insulation in Mild Climates: Just because your region isn’t known for harsh winters doesn’t mean freezing can’t happen. Even brief cold snaps can freeze uninsulated lines and cause major damage.
Failing to Test Backup Systems: Waiting until there’s an outage or emergency to test backup systems often reveals problems too late. Always verify functionality and capacity well before winter sets in.
Ignoring Rooftop Weatherproofing: High winds, sleet, and snow can damage rooftop units. Without protective covers or weather sealing, these components are at higher risk for corrosion, leaks, and ice buildup.
Assuming “Off” Equipment Doesn’t Need Care: Chillers and other unused units may be dormant, but they still require winter prep. Lubrication, drainage, and cover protection should all be part of the winterization checklist.
Waiting Too Long to Schedule Service: HVAC contractors book up quickly once the first cold snap hits. Schedule your HVAC winterization early to avoid delays and ensure everything is ready before the season changes.

Ideal Facilities for a Winterization Plan

Every commercial building benefits from HVAC winterization, but certain environments are especially vulnerable to heating issues or freeze-related system damage.

Healthcare Clinics and Hospitals: These buildings require precise climate control and cannot afford downtime. Winterizing ensures patient care areas stay warm and compliant with health codes.
Schools and Universities: Classrooms, dormitories, and lecture halls need consistent heating. Winter prep helps avoid interruptions during the busy academic season.
Warehouses and Manufacturing Plants: Facilities with sensitive inventory or equipment must maintain minimum temperature thresholds. Frozen pipes or failed heating systems can bring production to a halt.
Government and Municipal Buildings: Libraries, courtrooms, and city offices rely on steady indoor comfort. Proper winterization protects both public assets and taxpayer-funded infrastructure.

Partner With A&G Services Before the Freeze Hits

Preparing your commercial HVAC system for winter is about more than staying warm; it’s about protecting your infrastructure, controlling costs, and avoiding avoidable emergencies. By inspecting piping, testing backup systems, cleaning filters, and sealing gaps, facility managers can drastically reduce winter-related failures and energy loss. A well-executed HVAC winterization plan ensures uninterrupted service when you need it most.

Let A&G Services create a custom HVAC winterization plan tailored to your building and systems. Reach out today to schedule early, secure priority service, and keep winter disruptions off your calendar.

What Facility Managers Should Know About Commercial HVAC Winterization

Why Winterization Matters

Key HVAC Winterization Steps for Facility Managers

Common Mistakes to Avoid When Winterizing HVACs

Ideal Facilities for a Winterization Plan

Partner With A&G Services Before the Freeze Hits

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