A system 2 aircon uses one outdoor compressor to power two indoor units, usually one for the living room and one for a bedroom. It is the most common setup for 3-room and 4-room HDB flats in Singapore. A used system 2 aircon, or second hand system 2 AC, from K2L costs far less than a new setup while still keeping your whole flat cool.
One outdoor unit, two indoor units, one bill. Here is why it suits most Singapore homes.
Instead of buying two separate aircon systems, a system 2 setup uses a single outdoor compressor to cool two rooms, saving space on your aircon ledge.
A 3-room or 4-room HDB flat usually needs cooling in the living room and one bedroom, which is exactly what system 2 covers.
A new system 2 setup can cost $2,800 or more. A used system 2 aircon from K2L starts from $1,200, both units and installation included.
Both indoor units in your second hand system 2 aircon come with a warranty on parts and workmanship, not just one unit covered.
Every indoor unit in your system 2 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.
Both indoor units run and tested for full cooling performance before delivery.
System 2 works well if you want to cool the living room and one bedroom in an HDB flat or condo. If you need cooling in 3 rooms, look at our used system 3 aircon instead. As a general guide, the living room unit is usually 12,000 to 18,000 BTU and the 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 2 aircon uses one outdoor compressor unit to power two indoor units. It is common in 3-room and 4-room HDB flats where you want to cool the living room and one bedroom without running two separate systems.
A used system 2 aircon at K2L starts from $1,200, covering both reconditioned indoor units and full installation. Final price depends on brand, BTU, and piping length. WhatsApp us for an exact quote.
Yes, that is the most common setup. We size each indoor unit to the room it serves, so your living room and bedroom both get proper cooling from the one outdoor unit.
Reconditioned Daikin units, from $700.
Reconditioned Mitsubishi Electric units, from $700.
Covers 3 rooms with one outdoor unit, from $1,700.
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 2 setup and price for your flat.