A system 3 aircon uses one outdoor compressor to power three indoor units, enough to cool the living room and two bedrooms. It suits bigger HDB flats like 5-room units, executive flats, and condos. A used system 3 aircon, or second hand system 3 AC, from K2L covers your whole home for far less than buying three new units separately.
One outdoor unit, three indoor units, one bill. Here is why it suits bigger Singapore homes.
A system 3 setup cools three rooms from a single outdoor compressor, keeping your aircon ledge tidy and your outdoor unit count low.
A 5-room HDB flat, executive flat, or condo usually needs the living room and two bedrooms cooled, which is exactly what system 3 covers.
A new system 3 setup can cost $3,500 or more. A used system 3 aircon from K2L starts from $1,700, all three units and installation included.
Every indoor unit in your second hand system 3 aircon is covered by warranty on parts and workmanship, not just one room protected.
Every indoor unit in your system 3 setup passes the same 5 step check before installation.
Checked for faults, leaks, and part condition before entering stock.
Full disassembly and chemical cleaning of all components including coil and blower.
Worn or faulty parts replaced with genuine or compatible spares.
Refrigerant checked and topped up to manufacturer specifications.
All three indoor units run and tested for full cooling performance before delivery.
System 3 suits a 5-room HDB, executive flat, or condo where you need the living room and two bedrooms cooled. If you only need 2 rooms covered, our used system 2 aircon saves you more. As a general guide, the living room unit is usually 12,000 to 18,000 BTU and each bedroom unit around 9,000 BTU.
For official energy efficiency guidance on air conditioners in Singapore, see the NEA air conditioner guide. Not sure where to start? Read our step by step guide on how to buy second hand aircon in Singapore.
A system 3 aircon uses one outdoor compressor unit to power three indoor units. It suits bigger homes like 5-room HDB flats, executive flats, and condos where the living room and two bedrooms need cooling.
A used system 3 aircon at K2L starts from $1,700, covering all three reconditioned indoor units and full installation. Final price depends on brand, BTU, and piping length. WhatsApp us for an exact quote.
Yes, it is one of the most common setups for 5-room and executive HDB flats. We size each indoor unit to the room it serves so every part of your flat gets proper cooling.
Reconditioned Daikin units, from $700.
Reconditioned Mitsubishi Electric units, from $700.
Covers 2 rooms with one outdoor unit, from $1,200.
Sized and installed to fit HDB flats, from $700.
Reconditioned units for private and commercial spaces.
Learn the real difference before you buy.
WhatsApp us your room sizes and we will recommend the right system 3 setup and price for your home.