An inspection only saves energy if it finds problems that cost money and someone fixes them. This guide covers what to check, which findings usually matter most, and how to decide what to fix first.
What a routine inspection should check
- Filters: type, condition and pressure drop.
- Coils: fouling on both the face and the leaving side.
- Economizer: damper movement and sensor readings.
- Fans and motors: speed, amps against nameplate, belts.
- Controls: schedules, setpoints and any manual overrides left in place.
- Ducts: visible leaks, disconnected sections, damaged insulation.
- Zone behavior: any rooms that are too hot or too cold.
Findings that usually cost the most
- Equipment running outside occupied hours. A schedule or an override is often the cause, and it costs nothing to fix.
- Simultaneous heating and cooling. Zones fighting each other, or reheat on while the system cools.
- A failed economizer. The unit pays to cool air that outdoor air could have cooled for free.
- Fans running faster than needed. Verified by measuring airflow against design. See how airflow affects energy.
- Fouled coils and loaded filters.
Rank fixes by payback
Estimate the cost of each fix and the monthly saving, then divide. For illustration: a repair that costs $600 and saves $150 a month pays back in four months. A project that costs $12,000 and saves $300 a month needs 40 months. Do the quick ones first and plan the others. The numbers above are an example, not a benchmark. Use your own costs and your own bills.
Keep an inspection log
For each inspection note the date, what you checked, what you found and what you decided. Next time you can see if a problem came back. Here is a sensible record format.
Pair inspections with measured data
A visual inspection cannot tell you if a room gets the right airflow. A measured test can. Regular testing and balancing is how you confirm the system still does what it was designed to do.
Common mistakes
- Inspecting without a checklist. People check what they remember, and skip what they dislike.
- Writing findings and never acting on them. A list of problems with no owner and no date is just a record of neglect.
- Fixing symptoms. Lowering a setpoint because one room is warm hides an airflow problem.
- Not rechecking. Confirm after a fix that the reading changed.
A quarterly rhythm that works
- Walk the equipment with the checklist and record readings.
- Sort findings into “fix now”, “schedule” and “watch”.
- Assign each fix to a person with a date.
- Recheck the “fix now” items within a month.
- Compare utility bills with the same quarter last year.
Four short inspections a year, with this routine, find more than one long inspection nobody acts on.
Questions facility managers ask about HVAC inspections
How often should we inspect?
A quarterly walk-through of the main equipment, plus a deeper annual inspection before the cooling or heating season, suits most commercial buildings. Critical equipment may need more.
Who should do the inspection?
Your maintenance staff or a service contractor can do the equipment checks. For airflow and balance, bring in someone who can measure it with calibrated instruments, because you cannot see airflow by looking at a unit.
Our energy bill went up and nothing changed. What do we check first?
Start with schedules and overrides, then the economizer, then any zones heating and cooling at the same time. Those three explain most unexplained increases.
To add a measured baseline to your inspections, call Ghazi Hussain at (908) 323-9780 for a quote.
