Tag Archives: Economizer operation

How to Lower HVAC Costs in Large Commercial Buildings (Without Major Upgrades)

For large commercial buildings, HVAC is often the single largest energy expense. According to the U.S. Department of Energy, heating, cooling, and ventilation account for roughly 40 percent of total energy use in commercial facilities. The good news is that lowering HVAC costs does not always require replacing equipment or investing in a full system overhaul. With the right operational strategies and maintenance approach, building owners and facility managers can reduce energy consumption and extend system life without major capital upgrades. Here are practical, proven ways to lower HVAC costs in large commercial buildings. 1. Optimize Scheduling and Setpoints One of the most common sources of wasted energy is running HVAC systems longer than necessary. Adjust operating schedules Review current run times and align them with actual occupancy. Many buildings still operate on outdated schedules that no longer match staffing levels or tenant hours. Reduce runtime during evenings and weekends Implement holiday scheduling Adjust seasonal startup and shutdown timing Fine-tune temperature setpoints Small changes can make a measurable difference: Raise cooling setpoints by 1 to 2 degrees during summer Lower heating setpoints slightly during winter Avoid overcooling common areas and low-occupancy zones Even minor adjustments can produce noticeable energy savings across a large building footprint. 2. Improve Preventive Maintenance Practices Deferred maintenance is one of the fastest ways to drive up energy costs. Dirty, worn, or poorly calibrated components force systems to work harder and longer. Replace filters consistently Clogged filters restrict airflow and increase fan energy use. Regular filter replacement: Improves airflow Reduces strain on equipment Supports indoor air quality Clean coils and condenser units Dust and debris reduce heat transfer efficiency. Clean coils allow systems to operate at designed performance levels. Check belts, bearings, and motors Loose belts and worn components reduce efficiency and can increase electrical consumption. Routine inspections prevent energy waste and costly breakdowns. A disciplined maintenance plan often produces measurable energy savings without any equipment replacement. 3. Seal and Insulate Ductwork Air leaks in duct systems can waste significant energy, particularly in large facilities with extensive distribution systems. Inspect visible duct connections for leaks Seal joints with appropriate materials Insulate ducts in unconditioned spaces When conditioned air escapes into ceilings or mechanical rooms, the system must run longer to maintain comfort levels. 4. Balance the System Over time, air distribution can become uneven. Some areas receive too much airflow while others receive too little.An HVAC air balance ensures: Proper airflow distribution Reduced hot and cold spots Less simultaneous heating and cooling System balancing improves occupant comfort while reducing unnecessary runtime. 5. Leverage Existing Controls More Effectively Many commercial buildings already have building automation systems or programmable thermostats that are underutilized. Review control sequences Ensure that: Economizers are functioning properly Simultaneous heating and cooling are not occurring Setback schedules are active during unoccupied hours Use occupancy sensors If installed, confirm they are properly calibrated. Adjust zones where occupancy patterns have changed. Often, cost savings come from better use of systems you already have. 6. Reduce Outside Air When Appropriate Ventilation is essential for indoor air quality, but excessive outside air can increase heating and cooling loads. Verify economizer operation Ensure dampers are functioning correctly Adjust ventilation rates to meet, not exceed, code requirements Proper ventilation management lowers conditioning loads without compromising comfort or compliance. 7. Monitor Energy Trends You cannot manage what you do not measure. Track: Monthly utility costs Peak demand charges Runtime hours Maintenance intervals Energy spikes often indicate operational issues such as failing components or schedule drift. Trend analysis allows you to correct problems before they become expensive failures. 8. Train Staff and Tenants Occupant behavior impacts HVAC costs more than many realize. Encourage doors and windows to remain closed in conditioned spaces Prevent space heaters and portable AC units Educate tenants on proper thermostat use Clear communication reduces system strain and unnecessary overrides. The Bottom Line Lowering HVAC costs in large commercial buildings does not always require new chillers, rooftop units, or large capital investments. In many cases, the biggest savings come from: Smarter scheduling Consistent preventive maintenance Proper airflow management Better use of controls These operational improvements reduce energy waste, extend equipment life, and improve occupant comfort. How AirConnect Can Help AirConnect specializes in helping commercial facilities operate more efficiently without unnecessary upgrades. Our team evaluates your current HVAC performance, identifies operational inefficiencies, and implements practical improvements that deliver measurable savings. If your energy costs are rising but major equipment replacement is not in the budget, AirConnect can help you reduce operating expenses while protecting long-term system performance. Contact us today to get started.