Pre-Summer Commercial HVAC Checklist for Facility Teams
The best time to discover clogged condensate drains, dirty filters, failed fans, and dead thermostats is before the first hot week. Focus on airflow, drainage, controls, and obvious operation.
Last reviewed 2026-09-12 · General facility-maintenance information, not a substitute for site procedures, manufacturer instructions, codes, or qualified professional judgment.
Safety boundary
Likely causes
- Dirty filters
- Clogged condensate drains
- Failed controls
- Fan issues
- Seasonal startup faults
Symptom → cause → first move
Dirty filters
Check: Inspect and replace filters
First move: Correct basic airflow and drain problems
Clogged condensate drains
Check: Clean accessible condensate drains
First move: Repair control issues before peak heat
Failed controls
Check: Run each system in cooling
First move: Schedule service for abnormal units
Fan issues
Check: Measure representative supply temperatures
First move: Correct basic airflow and drain problems
Seasonal startup faults
Check: Test thermostats and schedules
First move: Repair control issues before peak heat
What to check first
Bring these
- Checklist or work-order app
- Flashlight
- Camera
- Basic inspection tools
Before touching anything
- Confirm the exact location and complaint.
- Photograph labels, settings, fault codes, and the original condition.
- Determine whether the failure affects one item or several nearby items.
- Know how to safely isolate the system if the task requires it.
Step-by-step procedure
- 1Inspect and replace filtersWith safe service access, verify each filter's size, condition, direction, and allowed rating; document replacements by equipment tag.
- 2Clean accessible condensate drainsInspect pans, traps, and condensate outlets using the unit's approved cleaning procedure; do not force compressed air into an unknown drain.
- 3Run each system in coolingRun each unit through an authorized cooling call and observe response without defeating delays, interlocks, or safeties.
- 4Measure representative supply temperaturesMeasure return and supply air with an air probe after operation stabilizes; log conditions and compare with the equipment's expected performance, not a fixed universal split.
- 5Test thermostats and schedulesVerify occupied schedules and return all temporary overrides to normal. Create work orders for failed cooling, drainage, airflow, or control checks before peak weather.
Routine fixes that make sense here
- Correct basic airflow and drain problems
- Repair control issues before peak heat
- Schedule service for abnormal units
Stop and call a licensed professional when
- Refrigerant or electrical repairs are needed
- Roof access is unsafe
- Repeated faults occur
- Critical cooling is affected
Common mistakes
- Replacing parts before proving the failure.
- Changing several settings or components at once.
- Failing to photograph the original condition.
- Ignoring whether nearby equipment has the same symptom.
- Crossing into electrical, refrigerant, life-safety, structural, or plumbing work beyond training.
FAQ
What should I check first?
Start by deciding whether the problem is local to one fixture or piece of equipment. Then begin with the simplest safe observation: inspect and replace filters.
What is the most common mistake?
Replacing parts before proving the failure. BuildingWrench recommends documenting the symptom, changing one thing at a time, and testing after each change.
When should maintenance stop?
Stop when the repair crosses your training or site-safety boundary. In this case, one clear handoff point is: refrigerant or electrical repairs are needed.
What should I document?
Record the exact location, model or asset tag, what the equipment was doing, what you checked, what you changed, and whether the fix held through repeated testing.
Parts for this repair
Infrared temperature gun
Fast non-contact temperature checks for HVAC and mechanical diagnostics.
Check on Amazon20×20×1 air filter
Example common filter size; always verify the exact required dimensions and rating.
Check on AmazonAffiliate links — BuildingWrench may earn a commission at no extra cost to you. Verify model, size, rating, and compatibility before ordering.