Winterization Checklist

Drain and winterize all external cooling towers and chiller systems.

• Yes
• No
• N / A

Remove or isolate all water supply lines to prevent freezing.

• Yes
• No
• N / A

Inspect and document condition for spring startup.

• Yes
• No
• N / A

Ensure disconnects are tagged “Winterized – Do Not Operate.”

• Yes
• No
• N / A

Close all attic vents once temperatures consistently drop below. 

• Yes
• No
• N / A

Inspect and test attic heaters protecting sprinkler piping and domestic water lines.

• Yes
• No
• N / A

Verify thermostats are functional and heaters are free of obstructions.

• Yes
• No
• N / A

Check insulation for adequate coverage over plumbing and sprinkler lines.

• Yes
• No
• N / A

Repair any damaged or missing insulation immediately.

• Yes
• No
• N / A

For dry sprinkler systems, empty all low-point drains and confirm valves are properly closed after draining.

• Yes
• No
• N / A

Verify air compressors for dry systems are operational and moisture traps are emptied.

• Yes
• No
• N / A

Ensure antifreeze loops have been tested by vendors within the last year and concentration is appropriate for projected temperatures.

• Yes
• No
• N / A

Inspect exposed sprinkler piping in unheated spaces; insulate as necessary.

• Yes
• No
• N / A

Remove garden hoses from hydrants and exterior hose bibs.

• Yes
• No
• N / A

Verify exterior hydrants and hose bibs are drained or frost-proof.

• Yes
• No
• N / A

Clear all leaves and debris from around the building foundation, HVAC units, and entryways to prevent fire hazards and rodent harborage.

• Yes
• No
• N / A

Ensure all exterior doors and weather seals are intact to reduce drafts and pest entry.

• Yes
• No
• N / A

Inspect and test all furnaces, boilers, and unit heaters to ensure proper operation.

• Yes
• No
• N / A

Replace all furnace and air handler filters.

• Yes
• No
• N / A

Confirm thermostats are calibrated and functional.

• Yes
• No
• N / A

Inspect flues, combustion air openings, and vents for obstructions.

• Yes
• No
• N / A

Review preventive maintenance logs to ensure heating PMs are complete.

• Yes
• No
• N / A

Inspect all windows and exterior doors for proper sealing.

• Yes
• No
• N / A

Identify and repair drafts or gaps that may lead to frozen pipes.

• Yes
• No
• N / A

Check crawl spaces and mechanical rooms for exposed plumbing—apply insulation where needed.

• Yes
• No
• N / A

Confirm resident comfort levels in all areas; adjust heating balance as necessary.

• Yes
• No
• N / A

Confirm vendors for HVAC, fire systems, and plumbing are scheduled for any outstanding inspections or service.

• Yes
• No
• N / A

Ensure emergency contact lists for winter-related failures (HVAC, sprinkler, plumbing, etc.) are current and posted.

• Yes
• No
• N / A

Review emergency power functionality (generators tested and ready).

• Yes
• No
• N / A

Confirm fuel levels and supply arrangements for extended outages.

• Yes
• No
• N / A

Ensure staff are aware of emergency heating and water shutdown procedures.

• Yes
• No
• N / A