Energy efficiency in a commercial building is rarely about one major problem. More often, energy waste comes from a combination of small inefficiencies across HVAC systems, lighting, and the building envelope. Without a clear understanding of where those issues exist, building owners may blindly spend money on upgrades that don’t address the biggest energy consumption bleeds.

That’s where an energy audit checklist for commercial buildings becomes valuable. A structured checklist gives energy auditors, and building owners, a consistent way to evaluate the major systems affecting building performance and identify opportunities to reduce energy consumption; and ultimately, operating costs.

What is an Energy Audit Checklist for Commercial Buildings?

An energy audit checklist for commercial buildings is a structured review of the major systems and conditions that influence a property’s energy consumption. While the exact checklist will vary based on building type, age, size, and equipment, a comprehensive audit typically examines:

• HVAC systems and controls
• Lighting and lighting controls
• Building envelope
• Electrical equipment
• Domestic hot water systems
• Mechanical equipment
• Building automation systems
• Utility bills and energy consumption
• Operating schedules
• Equipment age and condition
• Potential energy efficiency measures

The checklist gives the auditor a framework for evaluating the property as a whole. Rather than simply looking for old equipment, the auditor is trying to understand how systems interact, how they are being operated, and where improvements could provide the greatest return.

Start With 2–3 Years of Building Data

Before visiting the property, an energy auditor should gather as much historical information as possible. This typically includes two to three years of utility bills, equipment schedules, architectural drawings, maintenance records, and information about building occupancy and operating hours.

At a minimum, a detailed energy audit should have 12 months of utility data so the auditor can account for seasonal changes in heating and cooling demand.

This information helps establish the building’s Energy Use Intensity, or EUI, which measures how much energy a building consumes relative to its size. Comparing EUI and other energy-use trends against similar properties can help identify buildings that are consuming significantly more energy than expected.

HVAC Systems and Equipment

HVAC systems are one of the most important areas on any commercial energy audit checklist. An auditor should evaluate not only whether equipment is functioning, but whether it is operating efficiently and appropriately for the building.

This may include reviewing:

• HVAC equipment age and condition
• Thermostat settings and schedules
• Boiler and pump resets
• Chiller sequencing
• Economizer operation
• Outdoor air controls
• Variable frequency drives

Equipment age is especially important when developing a long-term capital plan. ASHRAE data shows that service life can vary significantly by equipment type, but examples from commercial buildings include centrifugal chillers with median service lives exceeding 25 years, steel gas-fired hot-water boilers exceeding 22 years, and metal cooling towers exceeding 22 years.

That doesn’t mean a 22-year-old boiler or 25-year-old chiller automatically needs to be replaced. Maintenance, operating conditions, reliability, and degree of use all affect the useful and economic life of equipment. Instead, equipment approaching the end of its expected service life should receive additional attention during an audit.

Lighting and Controls

Lighting should also be reviewed throughout the property. An auditor will typically document the types of fixtures being used, their operating schedules, and the controls associated with them.

Common opportunities include:

• Replacing outdated fixtures with LEDs
• Installing occupancy sensors
• Improving daylight controls
• Correcting unnecessary operating hours
• Adjusting lighting schedules
• Eliminating lighting in unoccupied areas

LED upgrades can provide meaningful savings, but replacing fixtures isn’t always the first or only opportunity. A building can have efficient lighting and still waste energy if lights operate during unoccupied hours or controls are improperly programmed.

Building Envelope

The building envelope is another major component of the energy audit checklist.

The building envelope is basically the physical barrier between the inside of a building and the outside environment. Think of it as the building’s “skin.”

 Walls, roofs, windows, doors, and other exterior components determine how effectively the building separates conditioned space from the outside environment.

An auditor may look for:

• Air leakage
• Inadequate insulation
• Damaged door seals
• Inefficient windows
• Roof deficiencies

Envelope deficiencies can increase heating and cooling loads, forcing HVAC equipment to work harder and cost more to maintain the same indoor temperatures.

For buildings in Colorado, this can be particularly important because large temperature swings between seasons can place significant demands on heating and cooling systems.

Equipment Lifespan and Replacement Planning

An energy audit shouldn’t only identify what is inefficient today. It should also help building owners understand what may become an efficiency or capital issue in the next several years.

Equipment age should therefore be documented as part of the audit. When a major system is approaching the end of its expected service life, the building owner may have an opportunity to combine replacement with a more efficient system, improved controls, or other upgrades.

This is one reason an energy audit can be useful even when a building isn’t experiencing obvious problems. Planning a replacement before equipment fails gives owners more time to compare options, evaluate incentives, and incorporate energy efficiency into the capital improvement plan.

How Often Should a Commercial Building Have an Energy Audit?

There isn’t one universal schedule for every property, but a commercial building energy audit can be especially valuable at several points in a building’s lifecycle.

What Happens After the Audit?

The most valuable part of an energy audit isn’t simply identifying problems. It’s understanding which improvements are worth pursuing.

A professional energy report should organize potential energy conservation measures based on their estimated cost, energy savings, payback period, and return on investment. This might include low-cost operational changes, moderate-cost equipment upgrades, or larger capital projects.

The result is a prioritized roadmap rather than a list of problems.

For example, an auditor may determine that adjusting HVAC schedules has an immediate payback, while replacing an aging chiller could provide a larger long-term return. Having both opportunities identified allows building owners to make decisions based on budget restrictions and upgrade timelines.

Cascade Building Solutions as Your Local Commercial Energy Auditor in Colorado

An energy audit checklist for commercial buildings provides a framework for understanding how a property uses energy, but the real value comes from turning those observations into actionable recommendations.

Cascade Building Solutions specializes in professional commercial and industrial energy audits in Denver, Colorado, and surrounding areas. We evaluate HVAC systems, lighting, building envelopes, and many other factors to building performance, and provide the building owner with a detailed report on energy usage and potential upgrades.

We’ve achieved an average of 24% decrease in total operating costs for major energy usage systems for our clients and estimated upgrade ROIs of 3-5 years. Cascade understands that an energy audit can yield tens of thousands in savings to commercial buildings, and we work diligently with our clients to determine the best optimizations that can be made.

Whether you’re dealing with rising utility costs, aging equipment, a planned renovation, or simply want a better understanding of your building’s energy performance, a professional audit can help you identify where your money is going and where improvements can make the biggest difference.