Ways to Reduce HVAC Energy Costs

Reducing HVAC energy costs is rarely about one major change. For most facilities managers, the quickest gains come from tightening day-to-day operation, correcting small control issues, and making sure plant is only running when the building actually needs it. When heating, cooling, and ventilation are left to drift, energy use rises quietly, and costs follow.

At MFM, we know first-hand how small adjustments can improve performance before larger upgrades are needed. In this article, we outline a prioritised approach, starting with zero-cost tweaks, moving into low-cost fixes, and ending with the bigger opportunities that can deliver long-term savings.

Low-Cost Tweaks with Fast Payback

The first place to look is your existing strategy. Many HVAC systems waste energy because setpoints, time schedules, and controls no longer reflect how the building is actually used. A site that changed occupancy patterns years ago can still be running as though every area is busy from early morning to late evening.

Start with setpoints. Heating and cooling bands that are too tight often make systems fight themselves, especially in mixed-use spaces or during seasonal change. A modest review of occupied temperatures, deadbands, and zone priorities can reduce unnecessary runtime without affecting comfort.

Scheduling is usually the area to focus on. Plant should match real occupancy, not assumed occupancy. If certain floors, meeting rooms, storage spaces, or welfare areas are only used at set times, your HVAC strategy should reflect that. Running full plant for lightly used spaces is one of the most common sources of avoidable spend.

Filter condition also matters. Dirty filters increase resistance, reduce airflow, and make fans work harder than they need to. Replacing blocked filters is simple, but it is often overlooked until performance complaints appear.

For a quick priority list, focus on these first:

• Review heating and cooling setpoints across all main zones.
• Check time schedules against actual occupancy and cleaning patterns.
• Reduce unnecessary early starts and extended overrun periods.
• Inspect filters, coils, and accessible plant for basic maintenance issues.
• Confirm local overrides have not been left permanently enabled.

Once these basics are in hand, move to low-cost improvements. Faulty temperature sensors, poorly positioned controls, and outdated logic can all cause systems to overheat, overcool, or cycle more than necessary. These issues are not always obvious from a high-level view, but they can have a steady impact on consumption.

Sensor calibration is a strong example. If a space temperature sensor is reading incorrectly, the system will respond to a false condition all day. The same applies to external air sensors, return air sensors, and frost protection controls. Small measurement errors can create large operating inefficiencies over time.

Control logic also deserves attention. Simultaneous heating and cooling, excessive fresh air rates, poorly staged plant, and fixed-speed operation where modulation is possible are all common sources of waste. In many buildings, control adjustments offer a better short-term return than immediate capital replacement.

Bigger changes can come later, once you know the basics are right. Plant upgrades, variable speed drives, improved zoning, and control system improvements can all reduce energy use significantly, but they work best when the operating strategy underneath them is already sound.

How to Measure Results

Savings are only useful if you can prove them. Before making changes, capture a baseline that shows how the system is performing now. That baseline should include utility data, plant runtime where available, known occupancy patterns, and any regular comfort complaints.

It also helps to separate weather-related variation from avoidable waste. Comparing one month directly to another is rarely enough on its own. A colder month will naturally raise heating demand, just as a warmer month will affect cooling energy. The goal is to track whether the system is operating more efficiently for the conditions it faces.

Useful measures include kWh consumption, runtime hours, alarm frequency, comfort callouts, and trend data from controls. Even simple weekly checks can reveal whether changes are working. If the same area keeps generating complaints after a setpoint review, the issue may be poor zoning, bad sensing, or a plant fault rather than user behaviour.

Energy Checklist

• Record current setpoints, schedules, and override arrangements.
• Take meter readings before and after each change.
• Track occupancy changes that affect demand.
• Review BMS trends for plant hours, temperatures, and alarms.
• Compare comfort complaints before and after adjustments.
• Document every change so savings can be linked to action.

A measured approach also helps with internal buy-in. When facilities teams can show that a scheduling change reduced runtime, or that correcting a sensor fault improved comfort while cutting waste, it becomes easier to build the case for the next improvement stage.

Common Mistakes to Avoid when Improving Your HVAC Efficiency

One of the biggest mistakes is moving straight to capital replacement before basic optimisation has been done. New equipment can improve efficiency, but it will not automatically solve poor scheduling, bad setpoints, or control conflicts. If the strategy is wrong, newer plant may simply waste energy more efficiently.

Another common issue is treating comfort complaints as a reason to lower or raise setpoints across the whole building. Local complaints are often caused by zoning problems, sensor locations, draughts, solar gain, or plant imbalance. Blanket changes can increase energy use while failing to solve the real problem.

It is also easy to ignore ventilation strategy. Outside air is essential, but excessive rates, poor control of dampers, or running ventilation at full duty when occupancy is low can add unnecessary heating and cooling load. This is especially important in commercial buildings with changing patterns of use.

Lack of follow-up is another avoidable error. Teams often make sensible changes, but never return to confirm whether the adjustment held, whether local overrides were reintroduced, or whether another issue appeared downstream. Energy reduction is not a one-off exercise. It works best when it becomes part of routine facilities management review.

Reduce HVAC Energy Costs With MFM

Reducing HVAC energy costs starts with clear priorities. For most facilities managers, that means fixing the basics first, measuring what changes, and then investing where the evidence supports it. Setpoints, schedules, filters, sensors, and control logic can all influence energy use more than many sites expect, and getting those right creates a stronger foundation for wider upgrades.

At MFM, we support businesses with the design, installation, servicing, and maintenance of heating, air conditioning, ventilation, and controls systems. If you want to reduce waste, improve plant performance, and build a more efficient HVAC strategy, we can help you identify practical opportunities and deliver the right solution for your site. Get started by contacting our team today.

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