Compare like-for-like billing periods
Collect available utility statements or meter readings for comparable periods, noting billing days and total consumption rather than comparing only the amount charged. Record major occupancy changes, new equipment, extended business hours or other loads such as pool pumps. If several meters serve the property, keep their readings separate. Remove account numbers and personally identifying details before sharing documents with a service provider.
Capture comfort complaints with location and time
Create a simple log of rooms that are too warm, too cold or humid, the time of day, approximate occupancy and whether problems coincide with certain schedules. Add thermostat settings only if the responsible facility team authorizes access. A property with uneven cooling may have airflow or control issues even when its overall consumption is normal, so comfort information matters alongside energy use.
Identify the equipment and controls
List air-conditioning units, air handlers, chilled-water connections where applicable, control zones, filter-service dates and the maintenance provider's most recent findings. Building management system trends or submeter data can be useful when available and legitimately accessible. Avoid sending passwords, remote login credentials or raw customer information; a service team should receive only information needed to scope the inspection.
What a site walk-through can establish
A qualified HVAC team can check scheduling, filter condition, temperature controls, unusual cycling, accessible plant-room conditions and reported comfort problems. A deeper energy audit may require metering, trend data and specialist assessment. The correct scope depends on the building type and its actual systems. An inspection may identify maintenance defects without establishing how much energy a future intervention will save.
Separate quick repairs from capital decisions
Use the resulting report to distinguish immediate maintenance, control adjustments, monitoring needs and larger replacement proposals. Ask each recommendation to show the underlying observation, expected benefit and how that benefit will be checked. Compare any investment case against a documented baseline; avoid assuming a universal payback period. Where necessary, commission the appropriate qualified and accredited specialist for a formal audit.
Measure whether improvements worked
Keep records of the intervention date, equipment affected, setpoints, operating hours and subsequent energy use. Recheck occupant comfort and compare consumption under reasonably comparable conditions. Cooling performance is sensitive to occupancy and weather, so simple month-to-month billing differences do not prove causation. Record unresolved faults and schedule a follow-up rather than treating the handover report as the end of the process.
Checklist before requesting service
- Do the bills cover comparable billing days and meters?
- What changed in occupancy, operating hours or other equipment?
- Which rooms and hours produce temperature complaints?
- Are maintenance history and asset details available?
- Can trend data be shared without credentials or personal details?
- How will findings and claimed savings be checked after works?
Frequently asked questions
Does one high bill prove that the AC is faulty?
No. Changes in occupancy, billing periods, weather, operations and other electrical loads can affect consumption.
Can the contractor guarantee a savings percentage before an audit?
A reliable estimate needs measured or documented conditions and a defined scope. Be cautious about generic guaranteed savings figures.
Request a site assessment
Request an HVAC review and share a redacted billing comparison, operating schedule and comfort log. Contact Power Zone.
Related service resources
This information is for general guidance and does not replace an on-site technical assessment or your building emergency procedures.