7 Mistakes You're Making with Commercial Air Conditioning Maintenance (and How to Avoid Them)
A commercial air conditioning failure is rarely just a maintenance issue. If it happens during a busy period, it can disrupt work, affect staff and customer comfort, and create an unplanned expense. A system that is poorly maintained can also use more energy or wear out sooner.
A planned approach helps you manage these risks. Here are seven common mistakes to look for, and practical ways to avoid them.
1. Waiting for a breakdown before arranging maintenance
Reactive repairs may seem cost-effective when equipment is running normally. But faults can develop unnoticed, then become more disruptive when the system is under pressure. Emergency call-outs, lost working time and replacement parts can all affect the overall cost of ownership.
Planned maintenance gives a technician the chance to identify wear, drainage problems and performance issues before they lead to a breakdown. It cannot prevent every fault, but it can help reduce avoidable interruptions and make spending more predictable.
How to avoid it: Set up a planned preventative maintenance schedule based on the equipment, its use and the site environment. Include an agreed process for reporting faults between visits.
2. Skipping or delaying F-gas leak checks
Some commercial air conditioning systems contain fluorinated gases, or F-gases, used as refrigerants. Where leak checks are required, their frequency depends on the refrigerant charge expressed in tonnes of CO₂ equivalent. The relevant calculation and requirements depend on the system, so do not rely on a generic calendar reminder.
Refrigerant handling is regulated. Checks and refrigerant work must be carried out by appropriately qualified personnel working for a certified company. Missed checks can mean a leak goes undetected, potentially affecting system performance and your records.
How to avoid it: Keep the refrigerant type and charge details for each relevant system in your asset records. Ask your maintenance provider to confirm which checks apply and when they are due. See the current GOV.UK guidance on F-gas leak checks.
3. Missing a TM44 air conditioning inspection
Routine servicing and a TM44 inspection are not the same thing. Certain air conditioning systems, depending on their effective rated output, must be inspected by an accredited energy assessor at set intervals. The inspection considers matters such as system efficiency, controls, maintenance and whether the equipment is appropriate for the cooling demand.
A TM44 inspection does not replace routine maintenance or F-gas checks. Keeping the latest report on file also helps demonstrate that the inspection has been considered and arranged where required.
How to avoid it: Check whether your building’s system falls within the inspection requirements, and confirm the current rules with an accredited assessor. Read the official guidance on air conditioning inspections.
4. Cleaning filters and coils too rarely, or overlooking drains
Dust and debris can restrict airflow through filters and coils. The system may then struggle to maintain the desired temperature and use more energy to do so. Blocked condensate drains can cause water to overflow, potentially damaging ceilings, walls or equipment. Poor cleanliness can also create hygiene concerns.
How quickly these problems develop varies with the building, its occupancy, operating hours and local conditions. A busy retail or hospitality space may need closer attention than a lightly used office.
How to avoid it: Arrange filter checks and cleaning at intervals appropriate to the equipment and site. Include coil condition and condensate drainage in professional maintenance visits. Staff can report visible leaks, unusual odours or reduced airflow, but should not open equipment or attempt refrigerant work.
5. Running the whole building as one zone
If a single control serves areas with different uses, the system may condition rooms that are empty or already comfortable. Meeting rooms, server rooms, open-plan offices and retail areas often have different schedules and temperature needs.
Zoned heating and cooling lets suitable areas be managed separately. Scheduling and sensible setpoints can help align operation with occupancy. The benefit depends on the system design, controls and how people use the building, so zoning should not be treated as a guaranteed saving.
How to avoid it: Review which rooms need independent control and when they are occupied. Check that schedules and setpoints reflect actual working patterns, and ask a professional to assess whether the existing controls can support changes.
6. Keeping no asset register or service records
When equipment fails, incomplete records can make it harder to identify the right parts, understand previous faults or plan a replacement. The same issue can arise when a new contractor takes over, or when you need to check what has been maintained.
A useful register should record:
- Unit reference and location
- Installation date, where known
- Equipment type and service history
- Refrigerant type and charge, where relevant
- Filter sizes and maintenance requirements
- Inspection reports, repairs and outstanding recommendations
How to avoid it: Keep one current register for the site and update it after each visit. Ask your contractor to provide a clear service report, including work completed, issues found and recommended follow-up.
7. Choosing on price alone, or overlooking the original design
A low quote may not include the same tasks, response arrangements or level of reporting as another proposal. Before appointing a contractor, check their relevant refrigerant-handling credentials, insurance, response times and exactly what the service includes.
It is also worth considering whether the system was designed appropriately in the first place. Poor sizing or zoning can leave areas uncomfortable and may affect running costs. For a new office air conditioning installation, a tailored survey should consider room size, insulation, solar gain, occupancy and how each space is used. That helps reduce the risk of oversizing or underperformance.
How to avoid it: Compare the scope of work, not just the headline price. Ask for a site assessment and a clear explanation of the recommended maintenance or design approach. Where a system provides both cooling and reverse-cycle heating, confirm that seasonal preparation covers both modes. Air source heat pumps in the UK include air-to-air systems that transfer heat between outdoor and indoor air; suitability depends on the building and system design.
What a planned maintenance schedule should include
A useful schedule is specific to the equipment and site. A visit that only cleans a filter may miss problems with drainage, electrical connections, controls or system performance. Ask your provider to explain what checks are included and what is recorded.
| Task | Typical frequency | Why it matters |
|---|---|---|
| Check filters and airflow | Set according to manufacturer guidance and site conditions | Helps maintain airflow and system performance |
| Inspect coils and condensate drainage | During planned visits, with additional checks if conditions require | Helps identify restrictions, blockages and leaks |
| Check electrical connections and controls | During professional maintenance | Can reveal wear, control faults or incorrect operation |
| Review refrigerant leak-check requirements | As required by current F-gas rules and system charge | Supports compliance and can help identify refrigerant loss |
| Arrange a TM44 inspection | When required under current guidance | Assesses efficiency, controls and maintenance |
| Review operation before seasonal demand | Ahead of expected cooling or heating use | Helps identify issues before a busy period |
| Update service and asset records | After every inspection, repair or maintenance visit | Supports troubleshooting, planning and contractor handovers |
The frequencies above are indicative. Manufacturer guidance, operating conditions, regulatory requirements and the condition of the equipment should inform the site’s actual schedule. For systems used for reverse-cycle heating as well as cooling, plan checks with both summer and winter operation in mind.
Frequently asked questions
How often should commercial air conditioning be serviced?
There is no single schedule suitable for every site. It depends on the equipment, usage, environment and manufacturer recommendations. A maintenance provider can suggest intervals after reviewing the system.
Are F-gas leak checks legally required?
They are required for some systems, depending on the refrigerant and its CO₂-equivalent charge. Check the current GOV.UK F-gas guidance and confirm the requirements for your equipment with an appropriately qualified provider.
What does a TM44 inspection involve?
An accredited assessor reviews the air conditioning system’s efficiency, controls, maintenance and suitability for the building’s cooling needs. Whether and when an inspection is required depends on the system and current guidance.
Is maintenance worth the cost compared with reactive repairs?
It depends on the equipment and how it is used. Planned maintenance can identify developing issues and help avoid some disruptive faults, but it cannot guarantee that breakdowns will not happen. Compare the planned service scope with the potential operational impact of unplanned repairs.
Can commercial air conditioning systems also provide heating?
Many reverse-cycle systems can provide both cooling and heating. Their suitability and performance depend on the building, system design and operating conditions.
If you manage premises in Kettering, Corby, Northampton, Peterborough, Leicester, Milton Keynes, Bedford or nearby, TotalTemp Control can discuss a maintenance package or a site survey. Find out more at totaltempcontrol.co.uk, or ask about air conditioning servicing in Kettering and the surrounding area.