How to Choose the Right Air Conditioner for Your Room

Updated Oct 2025 • 7 min read

Picking a split AC isn’t just about brand — it’s about the right capacity (kW), quiet operation, and tidy placement for your room. Here’s the simple checklist we use on surveys.

1) Size the system properly (kW)

• Small bedroom/office (8–15 m²): 2.0–2.5 kW
• Double bedroom/living (16–25 m²): 2.5–3.5 kW
• Larger lounge/open plan (26–40 m²): 4.2–5.0 kW

We fine-tune for ceiling height, glazing, aspect, and heat-gain (appliances/people).

2) Keep it quiet

Good wall units run < 21–25 dB(A) on low — perfect for bedrooms at night.

3) Placement matters

• Indoor: high on a free wall, blowing along the room length.
• Outdoor: firm base, good airflow, considerate to neighbours.
• Pipe routes: keep the neatest run with minimal trunking exposure.