How Many Aircon Compressors for HDB
When it comes to installing an air conditioning unit in HDB (Housing and Development Board) flats, one of the questions many homeowners have is ‘how many aircon compressors do I need?’ Whether you are looking to upgrade the capacity of your current air conditioning system or installing a new one, the answer depends on several factors, such as the type of air conditioner and the layout of your flat.
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What is an Aircon Compressor?
The compressor, often referred to as the heart of an air conditioning system, is responsible for compressing the refrigerant gas, raising its pressure, and circulating it through the system to remove heat from the air inside your flat. The compressor essentially works as the AC system’s engine. It facilitates the refrigerant’s heat absorption from the indoor air and then releases the heat outside. In HDB flats, two main types of air conditioners exist: single-split AC systems and multi-split systems. Each type has a different number of compressors.
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Three Types of Air Conditioners and Their Compressor Requirements
- A split air conditioning system consists of two main parts: an indoor unit (the evaporator) and an outdoor unit (the condenser and compressor). In this setup, the compressor is housed in the outdoor unit. Typically, for a single-room installation in an HDB flat, you’ll need one compressor for one indoor unit. If you’re cooling just one room, consider a basic single-split air conditioner. You will have one compressor outside, and the system will cool one specific area. This is the most cost-effective choice for smaller rooms such as bedrooms or living areas.
- A Multi-split AC systems are more complex. They have multiple indoor units connected to a single outdoor unit. The number of compressors depends on the system. In a multi-split setup, one compressor manages the cooling needs of several rooms, a more efficient and space-saving configuration than multiple single units. For example, a 2-way or 3-way multi-split system can cool two or three rooms with just one outdoor compressor. The benefit is reduced outdoor space usage and potentially lower installation costs. There are of course limits to how many indoor units one compressor can effectively manage. So, while it’s possible to have up to five indoor units connected to a single compressor, it’s still important to match the compressor’s capacity with the cooling demand of rooms being serviced. This article, “System 5 Aircon for HDB? Are we allowed to buy?,” expounds on the suitability (and unsuitability) of the system 5 aircon configuration.
- A Variable Refrigerant Flow (VRF) or Variable Refrigerant Volume (VRV) air conditioning systems are suitable for larger HDB flats with complex cooling requirements. These advanced systems use multiple compressors and allow for precise control of cooling in different parts of the house. They are designed to distribute refrigerant more efficiently and can provide independent temperature control for each room. The downside is that they are more expensive and require professional installation.
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How Many Compressors Do You Need for Your HDB Flat?
Professional aircon installation experts can assess your cooling needs and help you select the appropriate system size. And, generally, the number of compressors needed to cool your HDB flat depends on three factors:
- The size of your flat. Larger flats with more rooms may require multiple compressors. If you’re only cooling one room, a single compressor will suffice. For a multi-room flat, a multi-split or VRF system could be more appropriate.
- The number of rooms. As mentioned, split systems generally require one compressor per indoor unit. Multi-split systems, on the other hand, allow you to connect several indoor units to one outdoor compressor. The number of indoor units that can be connected to a single compressor depends on the system’s capacity.
- The cooling requirements. The cooling load for each room varies depending on factors like room size, insulation, window type, and how many appliances are used in the space. A professional aircon technician can perform a cooling load calculation to determine the required capacity of your system and the number of compressors needed.
