Air Conditioning 101: How Aircon Works and Which Type Suits Your Home

Air conditioning doesn't make cold — it moves heat

The single most useful thing to understand about air conditioning is that a unit does not create cold. It moves heat. A refrigerant — the gas and liquid that flows through the system — carries the heat from the air inside your home and dumps it outside. That movement is the whole job, and it is why an air conditioner must have an indoor and an outdoor part.

The cycle runs through four key components. The compressor squeezes the refrigerant into a hot, high-pressure gas. The condenser coil, usually on the outdoor unit, releases that heat outside and the refrigerant turns to liquid. The expansion device drops the pressure, making the refrigerant cold. Finally the evaporator coil pulls heat out of the room air as the refrigerant boils back to gas — and a fan blows the now-cooler air back into the room. It is a loop, and it runs constantly while the unit is on.

The main types of air conditioner explained

1. Split (midwall) system — the most common. An indoor unit on the wall connected to a compressor unit outside. Quiet, efficient and great for a single room or a small open-plan space.

2. Multi-split system — one outdoor unit runs two or more indoor units. Useful when you want whole-home coverage but have limited space outside for multiple outdoor units.

3. Cassette (ceiling) unit — a box mounted in a ceiling, blowing air in several directions. A staple in shops, offices and restaurants where wall space is limited.

4. Window unit — a self-contained unit that fits into a window or a wall opening. Cheap and easy, but noisier and less efficient, and best for a single room.

5. Portable unit — a movable single-room unit with no installation. The lowest entry point, but least efficient and regularly the noisiest of the lot.

6. Ducted (central) system — a single large unit hidden in the roof, feeding air through ducts to outlets in multiple rooms. The tidiest and most discreet whole-home option, and the most expensive to install.

Which type fits your home or business?

Match the type to the space, not the other way round. For one room — a bedroom, office or study — a split system is usually the best balance of cost, noise and efficiency. For an entire house, a multi-split or ducted system keeps the look clean and the temperature even. For a shop, office or restaurant, a cassette unit gives even, directional cooling without taking up wall space.

Whatever you choose, sizing matters more than the type. An undersized unit runs non-stop and still struggles on the hottest days; an oversized one short-cycles and wastes power. The capacity is measured in BTU, and getting it right for your room — ceiling height, sun on windows, insulation — is exactly what a proper in-home assessment is for.

What this means for Kariega and the wider Nelson Mandela Bay

Kariega — the town officially known as Uitenhage until February 2021 — sits roughly 30 to 35 kilometres inland from Gqeberha (formerly Port Elizabeth), and it runs warmer than the coast. In a climate that climbs well into the high 20s °C through summer, the type and size of the aircon you install genuinely change how comfortable your home is and what it costs you to run.

Whether you need a split for a single bedroom, a cassette for a shop, or a ducted system for a whole home, a local installer who understands the town's climate is worth more than a brand on the box. Leon's Air Conditioning installs, services and repairs air conditioning across Kariega, KwaNobuhle, Despatch and the wider Nelson Mandela Bay, Monday to Friday 08:00–18:00 and Saturday 08:00–17:00.