1. Frequently Asked Questions about Air Conditioning for Small Rooms Under 30m²
Most of us need to install an air conditioner for a house or room with an area under 30m² during hot summer days. However, few people understand how to calculate BTU according to room area, so every time they buy an air conditioner for a small room under 30m² or a 30m² house, they often have to search for information such as: 'how many horsepower air conditioner for a 30m² room', 'how many BTUs for a 20m² room air conditioner', 'how many BTUs for a 10m² room air conditioner'. Here are the quick answers to these common issues for your reference without spending too much time researching:
1.1 How Many Horsepower Air Conditioner for a 30m² Room?
The recommended choice for air conditioners under 30m² installation area is typically 18000 BTU, according to manufacturers and sellers. With the formula 1 horsepower (1HP) = 9000BTU, the answer to the question: How many horsepower air conditioner for a 30m² room? It's 2 horsepower (2HP) = 18000BTU.
1.2 What BTU is Suitable for a 20m2 Room Air Conditioner?
As mentioned earlier, we have the formula 1 horsepower (1HP) = 9000BTU. Room areas for air conditioning of 20m2 are often recommended to install a 1.5HP air conditioner, which corresponds to 1.5 horsepower = 12000BTU. So, if you wonder: How many BTUs for a 20m2 room air conditioner? The answer is 12000BTU.
1.3 What BTU is Recommended for a 10m2 Room Air Conditioner?
The 9000BTU air conditioner is often recommended by manufacturers and sellers for small spaces under 15m2. And the effective cooling area is about 5-10m2, so you can completely install a 9000BTU air conditioner for a small 10m2 room. Some types of portable air conditioners usually have capacities of about 6000BTU, 7000BTU, 8000BTU, these numbers are also suitable for installation in rooms under 10m2. Therefore, you can consider air conditioners with capacities from 6000BTU - 9000BTU for a 10m2 room!
2. Top 5 Affordable Air Conditioners for Small Rooms Under 30m2 by Sharp and Nagakawa
For small rooms under 30m2, the trend of choosing 18000BTU (2HP), 12000BTU (1.5HP), and 9000BTU (1HP) air conditioners is prevalent. In the budget-friendly range, Sharp and Nagakawa are always top priorities for many apartment owners. Here are the top 5 air conditioners of 2023, new and most worth considering from these two brands that you can refer to:
2.1 Sharp AH-X13ZEW Air Conditioner
The Sharp AH-X13ZEW air conditioner is equipped with 7 outstanding protective features simultaneously. Notable among them are fire resistance, corrosion resistance, lightning protection... Therefore, the Sharp AH-X13ZEW air conditioner always maintains stability and high durability throughout long-term use.

The superior Super Jet cooling technology, cools rapidly in just 5 minutes. Elegant white color, premium plastic casing with optimal scratch resistance. The Sharp AH-X13ZEW air conditioner has a capacity of 12000 BTU, suitable for installation in rooms of about 20m2.
The price of the Sharp Inverter 12000 BTU 1-way AH-X13ZEW air conditioner with R-32 gas currently on the market is only around under 7.9 million VND.
2.2 Sharp AH-X18ZEW Air Conditioner
In addition to the Super Jet technology, the Sharp AH-X18ZEW air conditioner also applies J-Tech Inverter, Eco technology. Therefore, the product has the ability to save energy effectively, operate stably, and durably. Moreover, the product is also equipped with a polypropylene dust filter mesh, so it also has antibacterial properties to help keep the air clean and fresh. The product has a capacity of 18000 BTU, suitable for rooms with an area of 20 to 30m2.

The price of the Sharp Inverter 18000 BTU 1-way AH-X18ZEW air conditioner with R-32 gas currently fluctuates around 11 million VND in the market.
2.3 Sharp AH-X10ZEW Air Conditioner
The Sharp AH-X10ZEW air conditioner, with its 9000btu capacity, is suitable for rooms of about 15m2. The Super Jet rapid cooling technology is still fully equipped in this AH-X10ZEW model. As a result, your room can drop to 5°C within just 5 minutes, providing an instantly cool and comfortable feeling. There are various modes for users to choose from, such as: Elderly mode, children mode, and night sleep mode...

The price of the Sharp Inverter 9000 BTU 1-way AH-X10ZEW air conditioner with R-32 gas is currently around 6.5 million VND.
2.4 Nagakawa C12R2T28 Air Conditioner
The Nagakawa C12R2T28 air conditioner is equipped with Economy and Inverter technology. Along with that is good dust filtering and antibacterial resistance. Therefore, choosing and installing the Nagakawa C12R2T28 air conditioner will help your family save a lot of electricity. Modern design, neat appearance, elegant white color. Turbo cooling technology provides natural cooling quickly according to the room temperature within 20 to 30 minutes.

The price range for the Nagakawa Inverter 12000 BTU 1-way NIS-C12R2T28 air conditioner with R-32 gas currently varies around 9.5 million VND.
2.5 Nagakawa NIS-C09R2T28 Air Conditioner
Although it can cool quickly, the Nagakawa NIS-C09R2T28 air conditioner still has effective energy-saving capabilities. Additionally, the product also has independent dehumidification capability. This feature truly brings surprising effectiveness for humid days. The Nagakawa NIS-C09R2T28 has a capacity of 9000 BTU, so it will meet the cooling needs for spaces of about 15m2.

The price range for the Nagakawa Inverter 9000 BTU 1-way NIS-C09R2T28 air conditioner with R-32 gas currently fluctuates around 8 million VND.
All 5 affordable air conditioner models from the Sharp and Nagakawa brands mentioned above are the latest models introduced by the manufacturers in 2023 that you can refer to and choose according to your installation needs and room area. Hopefully, your family has easily made a satisfactory air conditioner choice!