BTU & kW Sizing Tool

Enter your room details to calculate the required capacity.

Step 1 of 2

Length (m) Internal wall to wall

Width (m) Internal wall to wall

Height (m) Floor to ceiling

Usage type

Domestic Homes, apartments, small offices Commercial Shops, open-plan offices, retail

Room conditions

Direct sunlight windows Open plan or adjoining spaces Ceiling higher than 3 m Extreme seasonal heat or cold

Results will appear below and be added to your quote.

Request a quote

Share your contact details and we’ll follow up with a tailored proposal.

Step 2 of 2

Residential Air Conditioners and Commercial Air Conditioners BTU Calculator South Africa: FAQs

What size aircon do I need for a 20sqm room in South Africa?

For a standard 20sqm bedroom or office, a 9,000 BTU unit is typically sufficient. However, if the room has large north-facing windows or high ceilings, we recommend stepping up to a 12,000 BTU unit.

How do I calculate BTU for a room?

The basic formula for a standard 2.4m ceiling height is: (Length x Width) x 500. For example, a 15sqm room requires roughly 7,500 BTUs. Our calculator automates this and adds adjustments for South African sun exposure.

Does a 12000 BTU aircon use a lot of electricity?

Regular maintenance is crucial. We recommend a yearly service to ensure optimal performance, longevity, and to maintain healthy indoor air quality.

Is 9000 BTU enough for a lounge?

Usually, no. A 9,000 BTU unit is best for small bedrooms. For an open-plan lounge or living area in South Africa, you generally need a 18,000 BTU to 24,000 BTU unit depending on the floor space.

What happens if I buy an aircon with too few BTUs?

The unit will struggle to cool the room, the compressor will never cycle off, and your electricity bill will spike. Most importantly, you won't feel the "chill" you're paying for.

What size aircon do I need for a 30sqm lounge in Sandton?

For a 30sqm area, a 12,000 BTU or 18,000 BTU unit is ideal. In Sandton's glass-heavy modern apartments, the 18,000 BTU option is safer to combat solar heat gain.

Is a 9000 BTU aircon enough for a bedroom in Pretoria East?

Yes, a 9,000 BTU unit is the standard for bedrooms up to 18sqm. It offers the perfect balance of cooling power and energy efficiency for residential homes in the Lynnwood and Silverton areas.

What is the best aircon for the extreme heat in Rustenburg?

In Rustenburg, where temperatures regularly exceed 35°C, we recommend a "Gold Fin" treated unit with at least 12,000 BTUs for small rooms to ensure the unit can handle the ambient external heat.

How many BTUs do I need for an open-plan office in Witbank or Secunda?

Open-plan spaces in industrial hubs like Witbank or Secunda often have high heat loads from computers and machinery. We recommend our Commercial BTU Assessment for any space over 50sqm.

Can I install an aircon myself at Hartbeespoort Dam?

To maintain your warranty and ensure the BTU efficiency calculated above is met, we highly recommend using a Certified Breeze HVAC Installer. Humidity near the Hartbeespoort Dam requires specific drainage considerations during installation.

Brands We Trust

Let's work together

If you're curious about our experience in your industry, chances are that we indeed have a presence. We've successfully engineered, implemented, and maintained systems aimed at ensuring ideal temperatures and comfort for a wide range of structures. Our expertise spans various sectors, encompassing pharmaceuticals, food management, residential spaces, and retail establishments.



Address

Unit 97, Block 9A, Northgate Office Park, Aureole Ave, Northriding, Randburg, 2162



Email

sales@breezeaircons.co.za



Phone

011 568 7484
083 204 6287
076 445 5104 (Emergency Contact)

BTU Calculator South Africa