Commercial air conditioners don't fail overnight. They warn you first — for weeks, sometimes months. Most businesses miss the signals until it's too late.
A full system failure on the hottest afternoon of the year, with a full house of customers, is almost never a surprise to the equipment — only to the people running it. Knowing what to look for is the difference between a planned repair and an emergency.
1. Your electricity bill is climbing for no obvious reason
A system that's losing efficiency doesn't cool less — it cools the same but uses more electricity to do it. The output stays roughly constant. The input quietly grows. A 10% or more increase compared to the same month last year (not the previous month — seasonal variation makes month-to-month comparisons misleading) is a strong signal that something needs attention.
Common causes include dirty coils reducing heat transfer, refrigerant slowly leaking out, a compressor working harder as it ages, or temperature sensors that have drifted out of calibration and are running the system past setpoint without knowing it.
2. Some areas are freezing while others stay warm
Uneven temperatures across a commercial space are often the first visible sign of a refrigerant distribution problem — one indoor unit is getting too much, another too little. If the whole building runs consistently warm rather than unevenly, the issue is more fundamental: low refrigerant charge, an ageing compressor, or a system that's been asked to cool more space than it was designed for.
Worth knowing
Research consistently shows that customers in retail environments that are too hot, too cold, or too humid spend less time browsing and make fewer purchases. Temperature affects revenue in ways most business owners never connect to their HVAC system.
3. New noises or persistent smells
A well-maintained system should be heard only as neutral background noise. Any new sound — grinding, screeching, banging at startup, or persistent clicking — is the system communicating a specific problem. Grinding usually means bearing wear. Banging at startup often indicates a failing capacitor. Persistent clicking without the compressor running points to a worn contactor. None of these are emergencies yet — but all of them become expensive if left unaddressed.
Smells matter too. A musty smell means biological growth in the drain pan — common, unpleasant, and a genuine indoor air quality concern. A burning or electrical smell means switch the system off immediately and call for same-day service. It is not a 'monitor it' situation.
4. Water where it shouldn't be
Air conditioning produces water as a normal part of operation — a 12,000 BTU unit can generate 10–20 litres of condensate per day in humid summer conditions. That water drains away silently through a purpose-built drain system. When any part of that system blocks or fails, the water goes somewhere else: through ceiling tiles, down walls, onto electrical equipment.
The most common cause is algae blocking the condensate drain line — gradual, preventable, and catastrophic when it finally fails. A blocked drain line can cause more physical damage to a building in 24 hours than years of normal wear.
5. The system is over ten years old and repairs are becoming routine
Age alone isn't a reason to replace a commercial system — some well-maintained units far outlast their design lifespan. But age combined with increasing repair frequency, declining efficiency, and growing parts availability concerns creates a recognisable pattern.
The inverter technology available today is 30–40% more efficient than the best equipment available when a 12-year-old unit was installed. The electricity tariff that unit will run on for the next decade makes that gap widen every year. A planned replacement on your schedule costs significantly less and causes far less disruption than an emergency replacement during peak summer.
If your commercial system is showing any of these signs — or if it simply hasn't been professionally serviced in the past year — contact your nearest Jet-Air branch. We service commercial systems across South Africa's major centres.