Quick rule: size by room area, then tweak for ceiling height, sun, insulation, and Townsville humidity.
Start with area (m²) → cooling (kW):
- 10–20 m²: 2.0–2.5 kW (bedrooms)
- 20–30 m²: 3.5 kW
- 30–45 m²: 5.0–6.0 kW
- 45–65 m²: 7.1–8.0 kW
- 65–85 m²: 9.2–10 kW
Airconditioning Adjustments:
- Ceiling >2.4 m: add ~10–20%
- Full sun / west-facing: add ~10–15%
- Poor insulation / lots of glass: add ~10–20%
- Townsville humidity: lean to the higher end for better moisture removal
Tip: Under-sizing runs nonstop; over-sizing short-cycles and dehumidifies poorly.
For the best comfort and efficiency, get your electrician near me to load check before buying your air conditioner.
How big of an air conditioner do I need?
The right size depends on your room area, insulation, and local climate.
As a guide, a bedroom of 10–20 m² usually needs a 2.5 kW split system air conditioner, while medium living spaces (20–30 m²) need around 3.5 kW. Larger open-plan areas (40 m²+) often require 6–8 kW.
Choosing a trusted brand like a Mitsubishi air conditioner ensures reliable cooling and energy efficiency for years.
Getting the size right avoids wasted energy or poor comfort.
Always ask a licensed installer to calculate capacity so your home stays comfortable without overpaying on power bills.
| Room Size (m²) |
Recommended Capacity (kW) |
Suggested System Type |
Example Brand |
| 10–20 m² |
2.5 kW |
Split system air conditioner (ideal for bedrooms) |
Mitsubishi air conditioner – MSZ-AP25 series |
| 20–30 m² |
3.5 kW |
Split system (small living areas, offices) |
Mitsubishi air conditioner – MSZ-AP35 |
| 30–40 m² |
5.0 kW |
Split system (medium living rooms) |
Mitsubishi air conditioner – MSZ-AP50 |
| 40–50 m² |
6.0 kW |
Split system (large lounges, open areas) |
Mitsubishi air conditioner – MSZ-AP60 |
| 50–70 m² |
7.1–8.0 kW |
Split system / ducted |
Mitsubishi air conditioner – MSZ-AP71 / ducted options |
What size air con do I need for my home in Townsville ?
Choosing an aircon is like dating — find the right fit or you’ll pay for it later.
Small bedrooms in places like Townsville (10–20 m²) usually need a 2.5 kW unit. Medium living spaces (20–30 m²) suit 3.5 kW, while big open-plan areas (40 m²+) often require 6–8 kW.
If your home has high ceilings, lots of glass, or cops that hot western sun, go for the higher end.
The right size air conditioning keeps you comfy, saves power, and runs efficiently year-round.
A licensed installer will calculate the perfect fit for your Townsville home.