How to Quote the Right Air Conditioner Size Every Time – Tradie Guide

Date Posted:3 October 2025 

When the summer heat kicks in, the last thing you want is an air conditioner that struggles to keep up—or one that blasts too much cold air, leaving you uncomfortable and with higher electricity bills. Choosing the right split system air conditioner is about more than just picking a brand—it’s about making sure the unit is perfectly sized for your room.

In this guide, we’ll walk you through how to size up your split system, why it matters, and which models are best for Australian homes.

Why Split System Size Matters

If your air conditioner is too small for the space, it will run continuously and still won’t cool your room properly. Too big, and it’ll cycle on and off, wasting energy and wearing out faster. A correctly sized unit means:

  • Comfort – steady, even cooling (or heating).
  • Efficiency – lower power bills and less strain on the unit.
  • Longevity – your system lasts longer with less wear.

How to Size a Split System for Your Room

The right air conditioner size depends on room dimensions, insulation, and usage. Here’s a simple guide:

  • Small rooms (up to 20m²) – Bedrooms, small offices → ~2–2.5kW system
  • Medium rooms (20–40m²) – Living rooms, mid-sized areas → ~3.5–5kW system
  • Large rooms (40–60m²) – Open-plan spaces, lounge + dining → ~6–7kW system

Other factors to consider

  • Insulation – Well-insulated rooms need less cooling power.
  • Windows & Sunlight – More glass = more heat load.
  • Ceiling Height – High ceilings increase the required capacity.

Pro tip: Always check a room sizing chart from trusted brands like MHI or use expert advice for tricky spaces.

Recommended Split System Models for Aussie Homes

Here are some of our top picks for efficiency, comfort, and reliability this summer:

Get It Right the First Time

Choosing the right size air conditioner is the difference between sweating it out or enjoying cool, comfortable summers. Don’t leave it to guesswork—let our experts help you pick the perfect system for your space.

Contact us today to get the right split system installed before the summer rush!

 

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