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Split Aircon

System 1 vs System 2 Aircon: Which One To Choose?

System 1 vs System 2 Aircon

Choosing the right aircon system for your home can be confusing. In the country like Singapore, system 1, system 2, etc are common aircon terms. Choosing the right aircon for your space is not easy due to many available options. If you have small spaces with one or two rooms that need to be cooled, choosing between system 1 and 2 is a challenging decision. Let’s understand both these options in simple terms. We will describe you the differences between system 1 and system 2 aircons and tell you which system will be the right choice for you. Let’s get started. 

Comparison Table: System 1 vs System 2

Feature System 1 System 2
Number of indoor units 1 2
Number of rooms it cools 1 2
Outdoor unit required 1 per room 1 for 2 rooms
Suitable for Single room, small office 2-room HDB, condos
Cost (initial setup) Lower per unit Cheaper than 2 x System 1
Installation complexity Simple Moderate
Maintenance Easy Slightly more effort
Electricity use Lower for 1 room Better if 2 rooms used
Space needed outdoors More if many units added Less

 

What Is a System 1 Aircon?

A System 1 aircon has one outdoor unit and one indoor unit that can cool one room only. This setup is best for small flats, single rooms, or offices.

System 1 aircon working process

Pros of System 1

  • Simple to install
  • Easy to maintain
  • Great for small spaces
  • Usually cheaper upfront
  • Less power consumption for light use

Cons of System 1

  • Can only cool one room
  • May cost more if you install more units for other rooms
  • Uses more space if you add multiple systems later

 

What Is a System 2 Aircon?

A System 2 aircon has one outdoor unit and two indoor units. It cools two rooms at the same time. This setup is popular in HDB flats, condos, or small apartments with two bedrooms.

System 2 Aircon Working Process

Pros of System 2

  • Cools two rooms at once
  • Saves outdoor space
  • Less total cost than two System 1 units
  • Often more energy-efficient than two separate systems

Cons of System 2

  • Slightly more complex installation
  • Shared power — if one indoor unit breaks, it may affect the other
  • Both indoor units must be from the same brand and model series

 

comparison system 2 and 1

Major Differences Between System 1 and System 2 Aircons

Installation in Singapore HDB Flats

In Singapore, HDB flats often have space for only one or two outdoor units. System 2 is more popular for these flats because it uses less space for a single condenser unit. Many families choose System 2 for their bedrooms. It helps keep sleeping areas cool without adding extra outdoor units.

Always check your HDB rules. You may need approval for new installation or changes.

Energy Efficiency and Cost

Running one System 2 aircon is usually cheaper than two System 1 aircons. This is because the compressor is shared. Some System 2 setups also have inverter technology, which helps save electricity.

Still, if you only use one room often, System 1 may save more in your case.

Think about your daily habits. Are both rooms used at night? Or do you stay in one room most of the time?

Noise Levels

Both systems are quiet if installed well. Most modern aircons run smoothly. The noise level depends more on the brand and model than the system type.

System 2 may seem slightly louder if both rooms are using high cooling at the same time. But for most people, the difference is not noticeable.

Brands and Availability in Singapore

Popular aircon brands in Singapore include:

  • Daikin
  • Mitsubishi Electric
  • Panasonic
  • Midea
  • LG

All these brands offer both System 1 and System 2 options. Some even offer multi-split systems for 3 or more rooms. But System 1 and System 2 are still the most common for small homes.

Always buy from a trusted aircon dealer. Ask about warranty, servicing, and parts.

Servicing and Repairs

System 1 units are easier to fix. Each unit is separate. If one breaks, the rest are fine.

System 2 may be harder to service. The indoor units are linked. Sometimes, fixing one may involve checking the other. But good brands and proper installation help avoid most issues.

In Singapore, aircon servicing is easy to find. Look for BCA-registered contractors for safety and quality work.

Cost Estimate in Singapore

Prices vary by brand and installer. System 2 is more expensive but provides better value for money.

Below is a rough price estimate for both the systems:

  • System 1: SG$1,050–1,700 (includes basic installation)
  • System 2: SG$1,900–2,550 (includes basic installation)

Costs may be higher for inverter models or high-end brands. Some companies offer packages with free servicing for one year.

 

Which System Is Better for You?

There’s no single answer to the question whether system 1 or system 2 is better. It depends on individual needs, home size, and budget.

Choose System 1 If:

  • You only need to cool one room
  • You plan to use aircon rarely
  • You want a simple and cheaper option
  • You live in a studio or one-room flat
  • You don’t want to rely on a shared system

Choose System 2 If:

  • You want to cool two rooms
  • You live in a two-bedroom HDB or condo
  • You have limited space for outdoor units
  • You want a more cost-effective setup in the long run
  • You prefer a cleaner look without too many outdoor units

 

Which System Is Better for You- system 1 or 2

FAQ

What does “System 2” mean?

It means one outdoor unit connects to two indoor units. You can cool two rooms with one outdoor compressor.

Can I add a room to my System 2 later?

No. You must decide how many rooms you want at the start. If you want to cool more rooms, you’ll need System 3 or System 4.

Is System 2 cheaper to run than two System 1 units?

Yes, in most cases. System 2 shares one compressor, so it often uses less power than running two separate units.

Which system is better for resale value?

Both systems are common in Singapore homes. However, many buyers prefer System 2 or higher, as it looks neater and requires only a single compressor for running multiple rooms.

How often should I service the units?

Every 3 to 6 months is ideal. Regular cleaning helps your aircon last longer and run better.

Can I use different brands for System 2 indoor units?

No. The indoor units must match the outdoor unit. Mixing brands does not work.

 

Final Thoughts

Both System 1 and System 2 aircon systems have their advantages. System 1 is great for small, single-use spaces. System 2 suits homes that need cooling in two rooms. Think about your space, your daily use, and your budget.

If you are still unsure, talk to a local installer in Singapore. A quick check of your floor plan and needs will help you decide.

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