High Commercial HVAC Energy Bill

Likely causes

These categories help organize the diagnostic process; they are not a remote diagnosis.

• Schedules, overrides, simultaneous heating and cooling, bad sensors, or poor sequences
• Dirty filters or coils, slipping belts, failing fans, pumps, compressors, economizers, or controls
• Ventilation, pressure, duct, valve, refrigerant, envelope, setpoint, load, or utility-rate changes

Safe facility observations

Facility staff may record alarm text, thermostat or BAS display status, affected areas, time of onset, visible water or ice from a safe location, and unusual sound or odor. Do not open energized panels, reset a repeatedly tripping breaker, bypass safeties, force controls, handle refrigerant, work on combustion equipment, or enter pressure systems.

• Compare utility intervals, weather, occupancy, production, schedules, and recent changes
• Review alarms, overrides, setpoints, run hours, equipment status, and demand peaks
• Do not disable ventilation or safeties to reduce consumption

Professional diagnostic process

An investigation establishes a defensible baseline, then reviews schedules, loads, controls, ventilation, simultaneous loads, equipment condition, airflow, water flow, heat transfer, metering, and rates.

Equipment commonly involved

The fault can originate in the primary equipment or a connected system.

• RTUs and central plants
• Pumps and fans
• Ventilation and exhaust
• BAS, meters, sensors, and controls

Risks of delay

Delay increases cost and may conceal equipment degradation, comfort and ventilation problems, water or refrigerant faults, and avoidable demand peaks.

Repair considerations

Prioritize verified low-risk corrections, maintenance, sensor and schedule fixes, sequence changes, and equipment repairs with measurement of results.

Replacement considerations

Capital upgrades should document baseline, scope, operating effect, incentives, lifecycle cost, and a measurement plan; savings are not promised without this work.

Related maintenance

Trend schedules, overrides, alarms, sensors, filters, coils, economizers, airflow, water flow, fans, pumps, valves, setpoints, and utility data.

Safety notice

This guide is educational and is not a substitute for on-site diagnosis. Follow facility safety procedures and applicable code. If there is smoke, fire, suspected gas, exposed electrical damage, a significant refrigerant release, pressure hazard, or an immediate life-safety concern, evacuate or isolate the area as appropriate and contact emergency or qualified response personnel.