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What Regular HVAC Maintenance Delivers When Done Right
Done right, regular HVAC maintenance protects three things at once: system performance, running costs, and equipment life.
A commercial HVAC system has dozens of moving parts, including thermostats, condenser fans, compressors, dampers, evaporators, and air filters. Serviced regularly, they run at optimal capacity. Left unchecked, any one of them can fail and take the whole system down with it.
Regular servicing delivers on several fronts:
- Reducing the cost of emergency repairs and refurbishments
- Avoiding unexpected breakdowns that disrupt a residential or commercial environment
- Improving indoor air quality (IAQ) across a room, building, or facility
- Lowering energy bills
- Extending the working life of the system
In commercial settings, HVAC efficiency directly affects a productive, healthy workplace, with a measurable impact on health and general well-being. Good indoor air quality, a by-product of well-maintained ventilation, improves productivity for 97% of office workers, and 99% credit IAQ with at least one health-related benefit.
Video: Head of Workspace Solutions at Abri, Laura Wright, demonstrates the people management strategies that have been successful in boosting employee well-being and employee productivity.
The reverse is just as measurable. Poorly maintained units consume far more energy, and heating and cooling are already the single biggest contributors to energy consumption in commercial facilities (shown below).
Figure: HVAC energy breakdown in commercial facilities. Data source: environment.gov.au
When maintenance keeps ventilation working properly, the air-quality gains translate into hard business outcomes:
- Productivity: better ventilation is worth an estimated $6,500 (US) per person per year in productivity
- Performance: good IAQ lifts workplace performance by around 10%
- Health: improved ventilation is linked to 35% fewer staff sick days, plus better physical and mental health
- Allergies: 51% of office workers say better IAQ reduces allergic reactions such as sneezing and coughing, alongside fewer airborne contaminants
Skip that upkeep and the moving parts start to fail. A lack of maintenance can cut an HVAC unit’s lifespan by as much as 8 to 15 years. Once components go, the problems stack up fast:
- Emergency call-out fees for qualified technicians
- Ventilation shut down for reactive repairs
- Short cycling caused by blocked filters or faulty thermostats
- Refrigerant leaks in occupied office spaces
- Loud, abnormal noises that distract workers
- Dirt building up on air filters and condenser coils
Proactive maintenance heads all of this off. It inspects those same parts (thermostats, condenser fans, compressors, dampers, evaporators, and filters) before they become failures.
How CAFM and HVAC Software Improve HVAC Maintenance
Dedicated HVAC Software and CAFM systems give you the features to extend the life, efficiency, and reliability of your HVAC assets, turning maintenance from a reactive scramble into a planned, trackable process. Typical features include:
- Work order assignment and tracking
- Asset registers and equipment history
- Space planning, design, and management
- Building maintenance management
- Workforce and contractor management
- Energy tracking and optimisation
On their own, these are useful. Combined, they let you run every HVAC unit across a portfolio from one system. Here is how that plays out in day-to-day HVAC maintenance.
Building a Digital HVAC Asset Register
A digital asset register fixes the root cause of most HVAC problems: poor record-keeping. When no one knows how old a unit is, when it was last serviced, or what has already been replaced, faults get harder to diagnose. A CAFM system holds each asset (rooftop units, chillers, air handling units, split systems, and thermostats) in a searchable register with its make, model, install date, warranty status, service history, and location down to the floor and room. Log a fault, and the engineer arrives already knowing the unit’s history instead of diagnosing from scratch.
Automating Preventive Maintenance Schedules
Automated scheduling is where the software earns its place. Instead of tracking a paper checklist, you can encode the frequencies from a standard HVAC maintenance plan (monthly filter changes, quarterly coil cleans and refrigerant-line checks, six-monthly belt and ductwork inspections, and annual gas-connection and ignition tests) and have the system auto-generate work orders when each is due. A planned preventive maintenance (PPM) plan that once lived in someone’s head becomes a self-triggering schedule that survives staff turnover and never quietly lapses.
Moving from Time-Based to Condition-Based Maintenance
Condition-based maintenance replaces fixed calendars with real-time triggers. Where Internet of Things (IoT) sensors are fitted, HVAC Software raises a work order when a filter’s pressure drop crosses a threshold, a motor’s vibration climbs, or a unit’s runtime hits a set number of hours. This catches early warning signs, such as short cycling, rising energy draw, and abnormal temperatures, before they become the breakdowns and refrigerant leaks that force emergency call-outs. It also avoids servicing parts that do not yet need it.
Managing Compliance and Inspection Certificates
Compliance management stops HVAC certificates from lapsing, which is easy to miss and expensive to fail. A CAFM system stores and sets reminders against the UK requirements covered elsewhere on this page: F-Gas handling records, the five-yearly check for systems over 12kW, and TM44 inspection certificates. Renewals are flagged in advance, and every certificate is retrievable in one place during an audit. Compliance shifts from a scramble before inspection to a standing, evidenced process.
Coordinating Engineers, Contractors, and SLAs
Coordination features assign the right person to the right HVAC job and hold everyone to agreed timings. HVAC work is often split between in-house teams and specialist subcontractors. The software assigns each job to a technician with the correct qualification, for example only F-Gas-certified engineers for refrigerant work, and tracks response and completion times against agreed service level agreements (SLAs). Mobile access lets engineers view asset history, close jobs, and log parts used from site, with no paperwork round-trip back to the office.
Managing Spare Parts and Reducing Downtime
Parts management cuts the downtime caused by arriving on site without the right component. Link maintenance to a parts inventory, and the belts, filters, and contactors a planned job needs are reserved and in stock before the engineer is dispatched. That removes the repeat visits and unplanned downtime that come from a missing part.
Tracking Energy, IAQ, and Cost in Real Time
Real-time tracking turns HVAC into a measured cost rather than a guessed one. HVAC is typically the single largest energy load in a commercial building, so the reporting side matters as much as the maintenance side. You can track energy consumption per unit, monitor indoor air quality in real time, optimise heating and cooling through smart thermostats, and see maintenance cost per asset. That last figure reveals which ageing units are cheaper to replace than to keep repairing.
Three HVAC Maintenance Types to Consider
Choosing a maintenance plan for your HVAC unit depends on budget, facility, use (is it required all year round or only in certain periods?) available engineers, and more. Essentially, there are three maintenance types to choose from:
- Planned preventive maintenance (PPM)
- Responsive/Reactive maintenance
- Routine maintenance
1. Planned Preventive Maintenance For HVAC Systems
Preventive maintenance plans are put in place to ensure HVAC systems remain operational for as long as possible without fail through scheduled inspections, checks, and maintenance. PPM is typically initiated with the use of Facilities Management, Building Maintenance, or HVAC Software.
Although there are challenges associated with deploying PPM (like high upfront costs and excessive data gathering), the benefits outweigh them. They include:
- Lower maintenance costs in the long term
- Prolonged HVAC system life
- Reduced health and safety risks (avoiding leaking condensate pipes or excessive gas build-ups)
2. Responsive/Reactive Maintenance
Like any reactive maintenance plan, HVAC systems are only checked on if something goes wrong. Responsive maintenance is deployed to save time and money in the short term but can be disastrous in the long term.
Reactive maintenance plans have a 40% higher cost expectancy than preventive maintenance due to downtime and emergency repair costs.
3. Routine Maintenance
Routine maintenance is one of the most popular types when it comes to building maintenance. This is because it can be done with manual tools such as pen and paper or spreadsheets.
Using HVAC maintenance checklists, maintenance teams can routinely schedule daily, weekly, monthly, bi-annually, or annual checks to keep systems in working condition. These include cleaning, checking pipes for leaks, cleaning and replacing air filters, and more.
Routine checks can also be outsourced to specialist service teams for more heavy-duty tasks (like calibrating thermostats and lubricating moving parts).
Routine Checklist Example For HVAC Maintenance
Whether opting to keep your HVAC maintenance in-house or to outsource it, a qualified technician will typically follow a checklist for carrying out work. A HVAC maintenance checklist will cover tasks such as:
Maintenance | Frequency |
|---|---|
| Change air filters | Monthly |
| Inspect insulation | Monthly |
| Clean condensate drain | Monthly |
| Check outside unit | Monthly |
| Check/Test thermostat settings | Monthly |
| Examine refrigerant lines for leaks | Quarterly |
| Clean coils | Quarterly |
| Inspect fans and motor | Quarterly |
| Clean heat exchanger | Every 6 months |
| Check refrigerant levels | Every 6 months |
| Inspect belts and pulleys | Every 6 months |
| Inspect ductwork | Every 6 months |
| Schedule professional maintenance inspection | Yearly |
| Test ignition system | Yearly |
| Check gas connections | Yearly |
| Lubricate moving parts (bearings, motors, etc.) | Yearly |
Recognising the Need for HVAC System Maintenance
Commercial HVAC systems have several moving parts, which, without proper servicing and regular maintenance, increases the risk of breakdowns and failures. A lack of maintenance can reduce the lifespan of a HVAC unit by 8 to 15 years.
Proactive HVAC maintenance will cover inspecting parts such as thermostats, condenser fans, compressors, dampers, evaporators, air filters, and more. If any one or more of these parts fail, several issues can arise:
- Paying emergency call-out fees for qualified technicians
- Shutting down ventilation systems for reactive repairs
- Experiencing short cycling due to blocked filters or damaged thermostats
- Having refrigerant leaks in office spaces
- Loud and abnormal noises that distract workers
- A build-up of dirt on air filters and condenser coils
Find the CAFM or HVAC Software to Plan & Track Your HVAC Maintenance Activities
What Type of Facilities Do You Manage?
Legal Ventilation and HVAC Inspection Requirements In the UK
While regular upkeep is important for improving the working environment, there are several laws and requirements that commercial HVAC systems need to meet. Facility managers need to know that:
Air conditioning units containing F-Gases (refrigerants) must only be handled by a certified technician
HVAC systems with a capacity of over 12KW need to be checked by qualified technicians every 5 years
Buildings must have a valid TM44 inspection certificate after every HVAC check
When it comes to requirements for IAQ and ventilation, there are various recommendations for different air pollutants. For CO2, the Health and Safety Executive (HSE) recommends 5,000 ppm (parts per million) over 8 hours. Although, since the COVID-19 Pandemic, SAGE suggests this limit be at 1,500 ppm.
For commercial use, the recommended guidance and limits are:
Air Pollutant | Recommended Limit | Guidance From |
|---|---|---|
| CO2 | 1,500 ppm | SAGE |
| NO2 | 3 ppm | WHO |
| Benzene | 0.1 ppm | WHO |
| PM 2.5 | 10µg/m3 | WHO |
| TVOCs | 300µg/m3 | BREEAM |
The Maintenance-Related Benefits of Smart HVAC Systems
The use of IoT technologies for the creation of smart buildings is a trending topic among facility managers and building owners. These smart upgrades range from automated space planning tools to smart thermostats – a market predicted to triple from $1.1 billion in 2021 to $3.2 billion in 2028 in the US.
One area considered for a smarter upgrade in commercial buildings is the HVAC system. With a typical office HVAC unit accounting for 40% of total building energy consumption, there is a high demand to improve efficiency through smarter systems.
By upgrading to smarter HVAC systems, buildings will benefit from:
- Reduced energy consumption and total output
- Fewer breakdowns through overuse
- Reduced energy costs used to run HVAC systems
- A more focused output of heating and cooling
A smart HVAC system works by installing sensors and collecting data on its usage. These devices are connected and information is displayed in systems such as Facilities Management Software. From here, HVAC systems are either automated or a precise schedule is built to better utilise units such as during working hours or when temperatures are above or below a certain threshold.
Since 2023, there has been a push for more efficient heating and cooling systems. These include the introduction of less-toxic refrigerants, such as R-454b, which has a lower global warming potential.
As well as the use of CO2-based demand-controlled ventilation (DCV), which can reduce HVAC energy output by as much as 70%.
Future Trends In the HVAC System Market
A study on the HVAC system market indicated 4 key drivers for change:
- Need for energy-saving HVAC systems
- Increased construction activities (residential and Industrial)
- Government regulatory policies and green incentives
- Demand for better indoor air quality
With this comes the introduction of advanced tech and growing demand. Innovative change is providing facilities with multiple heating and cooling options such as Variable Refrigerant Flow (VRF) systems, heat pumps, air handling units (AHU), and advanced air filters.
There is one main restraint for these drivers of new tech, however; the increasing expenses associated with maintenance, repairs, and installation.