If a space no longer reaches its usual temperature, start by checking the operating mode, temperature setting and schedule. A system running in fan-only mode, for example, will circulate air without actively cooling it.
If the settings are correct, reduced performance could be linked to restricted airflow, a dirty outdoor unit, a refrigerant issue or a component fault. The symptom alone does not identify the cause.
Look out for:
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Slower cooling. Rooms take noticeably longer to reach a comfortable temperature.
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Persistent warmth. The system operates but struggles to meet the set temperature.
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Reduced cooling from the outlets. Air feels warmer than expected during cooling operation.
A professional inspection can establish whether the problem involves maintenance, controls or a repair.
Airflow feels weaker than usual
A unit may still make its normal operating sound while delivering less air into the room. Dirty filters or obstructed air inlets and outlets can restrict airflow and affect cooling performance.
Check for visible obstructions such as furniture or stored items around the unit. Leave internal inspection and cleaning to someone competent to carry out the work, following the manufacturer’s instructions.
Signs worth reporting include:
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Weak air movement. Less air reaches the occupied area than it used to.
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Visible dust build-up. Filters or grilles appear dirty.
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Obstructed outlets. Furniture, displays, or stock interfere with air circulation.
The system is making unfamiliar noises
Some sounds are normal, including brief clicks or changes in refrigerant flow. A new, persistent or significantly louder noise deserves attention, particularly if it accompanies reduced performance.
Unusual vibration, rattling or mechanical noise can be associated with loose components, airflow restrictions or worn parts. Recording when the sound occurs can help an engineer investigate.
Useful details include:
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When it happens. At start-up, during operation or when the unit stops.
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Where it comes from. The indoor unit, outdoor unit or surrounding ductwork.
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What has changed. A new sound, increased volume or vibration that was not previously present.
Avoid opening equipment or attempting to tighten internal components while it is operating.
Water is leaking from an indoor unit
Air conditioning removes moisture from the air during cooling. This normally collects as condensate and drains away through a dedicated drainage arrangement.
Water dripping from an indoor unit, staining a ceiling or pooling beneath equipment needs investigation. Possible causes include a blocked drain, a drainage fault or ice forming and subsequently melting.
Look out for:
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Drips or puddles. Water appears beneath the indoor unit.
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Ceiling or wall marks. Damp patches develop around the installation.
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Visible ice. Frost or ice appears on parts of the cooling equipment.
Stop using a leaking indoor unit and arrange an inspection, particularly where water could reach electrical equipment. Water or steam from an outdoor unit during heating can be part of normal defrost operation, so the location and operating mode matter.
Unpleasant smells appear during operation
A persistent musty or unpleasant smell should be investigated. Air conditioning can circulate odours already present in a room, so the source may be the equipment or the surrounding space.
Report when the smell occurs and whether it affects one unit or several. Avoid spraying household cleaning products into the equipment, as unsuitable chemicals can damage internal components.
A burning smell requires immediate attention. Stop the system, isolate its power if safe to do so and arrange urgent professional assistance. If there is smoke or fire, follow the building’s emergency procedure.
Running costs are rising without a clear explanation
An increase in electricity costs can prompt a review of air conditioning performance, although a higher bill does not prove that the equipment is faulty.
Compare costs alongside:
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Weather conditions. Hotter periods can increase cooling demand.
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Operating hours. Check whether schedules have changed or units run outside occupancy hours.
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Building use. More occupants or heat-producing equipment can increase demand.
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Energy tariffs. Higher prices can raise bills even when consumption stays similar.
If electricity use rises under otherwise comparable conditions, especially alongside poorer cooling, arrange a performance assessment. Changes in running costs are a recognised reason to have a system checked.
Faults keep returning
Repeated shutdowns, recurring fault codes or frequent call-outs deserve a closer review. Keep a record of the symptoms and previous repairs so the engineer can assess the pattern.
Before a visit, gather:
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The fault code. Photograph the controller display if possible.
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The affected area. Identify which room or unit has the problem.
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The timing. Note when the fault occurs and how often it returns.
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Recent changes. Record alterations to settings, layouts or building use.
Follow the equipment’s operating instructions and avoid repeatedly resetting a system that continues to fault.
Repeated shutdowns, recurring fault codes or frequent call-outs deserve a closer review. Keep a record of the symptoms and previous repairs so the engineer can assess the pattern.
Before a visit, gather:
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The fault code. Photograph the controller display if possible.
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The affected area. Identify which room or unit has the problem.
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The timing. Note when the fault occurs and how often it returns.
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Recent changes. Record alterations to settings, layouts or building use.
Follow the equipment’s operating instructions and avoid repeatedly resetting a system that continues to fault.
Regular maintenance helps identify problems early
Planned maintenance provides an opportunity to check condition and performance before an obvious breakdown occurs. The maintenance schedule should reflect the equipment, manufacturer’s guidance, operating hours and site environment.
Depending on the installation, a visit may include:
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Filter and coil checks. Assessing cleanliness and airflow.
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Drainage checks. Inspecting condensate trays, drains and pumps where fitted.
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Operational checks. Reviewing temperatures, controls and unusual noise.
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Condition checks. Identifying wear or developing faults.
Regular attention helps teams understand how their equipment is performing and plan any necessary remedial work.
Talk with Chillax Engineering
If your commercial air conditioning is showing signs of reduced performance, Chillax Engineering can help investigate the problem and advise on servicing, maintenance or repairs.
Call us on 01933 313350 or get in touch to arrange a visit.
