Choosing the right air conditioning system can be confusing in Singapore. There are so many types of aircon systems available in this countries that the homeowners often can not decide correctly which one to choose. System 2 and System 3 aircon units are popular choices for small to medium size home and offices. But which one suits your needs better? Let’s find out the differences between a system 2 and system 3 aircon, know their unique advantages and try to find out which one will be perfect for your needs.
What Is a System 2 Aircon?
A System 2 aircon means one outdoor unit is connected to two indoor units. This setup lets you cool two rooms at the same time. It’s often used in smaller HDB flats, condos, or apartments.
System 2 is ideal for people who live in a smaller space or only need aircon in two main rooms—such as a bedroom and a study room.
What Is a System 3 Aircon?
A System 3 aircon means one outdoor unit is connected to three indoor units. It’s suitable for people who want to cool three separate rooms at once. This system is common in 3-room or 4-room HDB flats and medium-sized condominiums.
System 3 gives more coverage and flexibility for families or anyone who uses multiple rooms regularly.
Table of Comparison
Here is a quick comparison between System 2 and System 3:
| Feature | System 2 | System 3 |
| Number of Indoor Units | 2 | 3 |
| Outdoor Unit | 1 shared unit | 1 shared unit |
| Room Coverage | Suitable for 2 rooms | Suitable for 3 rooms |
| Cooling Power | Less than System 3 | Higher than System 2 |
| Installation Cost | Lower | Higher |
| Electricity Use | Lower | Higher (if all units are used) |
| Common Use Case | Small flats or two-room use | Larger flats or three-room use |
| Best for | Couples or small families | Families with 3-room flats |
Key Differences Between System 2 and System 3 Aircon
Let’s break down the main differences between these systems in simple terms.
1. Number of Indoor Units
The most obvious difference between system 2 and 3 is the number of rooms you can cool at once. System 2 supports two rooms. System 3 supports three rooms.
2. Power Usage
System 2 usually uses less electricity, especially if you don’t turn on both indoor units all the time. System 3 can use more power, depending on your usage. If you run all three units for many hours a day, expect higher bills.
3. Installation Cost
The installation cost of a system 2 is cheaper. You’ll spend less on materials and labor. System 3 costs more due to the extra indoor unit and wiring.
4. Space Consideration
Both systems use one outdoor compressor unit. But System 3 may require a larger compressor model. Make sure your outdoor space (e.g., aircon ledge) can fit it.
5. Daily Use
If you only use aircon in your bedroom and one study or living room, System 2 is likely enough. But if all rooms are used and need cooling, System 3 is more practical.
Which One Should You Choose?
The choice between a system 2 and system 3 depends on your flat size, family needs, and how many rooms you use daily.
Pick System 2 if:
- You live in a 2-room or small 3-room HDB flat
- You only need cooling in two rooms
- You want to reduce installation and electricity costs
Pick System 3 if:
- You live in a 3-room or 4-room HDB flat
- You need to cool three rooms at the same time
- You have a bigger family or use more rooms frequently
Always check the total BTU (cooling power) of the system before buying. Make sure it matches your room sizes. You can ask the supplier for help with sizing.
Popular Brands for System 2 and 3 in Singapore
Many brands offer both System 2 and System 3 aircons in Singapore. Some trusted ones include:
- Daikin
- Mitsubishi Electric
- Panasonic
- Midea
- LG
All these brands offer energy-efficient models with inverter technology, which can help reduce electricity use in the long run.
Extra Tips Before Buying
Choose inverter aircons: Inverter aircon models adjust power based on usage and can save you money over time.
Look for 5-tick energy labels: In Singapore, NEA tick ratings for aircons are based on energy use. More ticks mean better savings.
Check warranty coverage: Choose a brand that offers good after-sales service.
Think about future needs: If you plan to use more rooms in the future, System 3 may be a better long-term choice.
FAQ
What does “System 2” mean in aircon?
It means one outdoor unit supports two indoor units.
Can I upgrade from System 2 to System 3 later?
No. You would need to buy a new system that includes three indoor units.
Is System 3 more expensive to run?
Yes, if you run all three units often. But if you only run one or two, the power use can be similar to System 2.
Do both systems need the same outdoor space?
Usually yes, but System 3 may need a slightly bigger compressor. Always check with the installer.
Is it okay to mix brands between indoor and outdoor units?
No. All parts should be from the same brand and model series.
Do I need a permit to install these in my HDB flat?
Not usually, but always check with your aircon contractor. They will handle most of the approval steps.
