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.
Likely causes
Do not jump straight to the most expensive possibility. These are the common places to start:
- Dirty filters
- Clogged condensate drains
- Failed controls
- Fan issues
- Seasonal startup faults
| Possible cause | How to check | Routine first move |
|---|---|---|
| Dirty filters | Inspect and replace filters | Correct basic airflow and drain problems |
| Clogged condensate drains | Clean accessible condensate drains | Repair control issues before peak heat |
| Failed controls | Run each system in cooling | Schedule service for abnormal units |
| Fan issues | Measure representative supply temperatures | Correct basic airflow and drain problems |
| Seasonal startup faults | Test thermostats and schedules | Repair control issues before peak heat |
Tools and preparation
Bring these
- Tape measure
- Flashlight
- Clipboard
- Exact model manual and phone for documentation
- Air-temperature probe
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 checks
Inspect and replace filters
With safe service access, verify each filter's size, condition, direction, and allowed rating; document replacements by equipment tag.
Clean accessible condensate drains
Inspect pans, traps, and condensate outlets using the unit's approved cleaning procedure; do not force compressed air into an unknown drain.
Run each system in cooling
Run each unit through an authorized cooling call and observe response without defeating delays, interlocks, or safeties.
Measure representative supply temperatures
Measure 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.
Test thermostats and schedules
Verify 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
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.
When to stop and hand it off
- Refrigerant or electrical repairs are needed
- Roof access is unsafe
- Repeated faults occur
- Critical cooling is affected
Frequently asked questions
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.
Related BuildingWrench guides
BuildingWrench provides general educational information for commercial-facility maintenance. Manufacturer instructions, applicable codes, site procedures, and required trade qualifications always take priority.
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Tools that fit this task
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Record location, readings, defects, responsible person, and follow-up date.