❄️ What Size Air Conditioner Do You Need? – AC Store Guide
At AC Store, we make it simple to choose the right air conditioner for your home or business. Picking the correct size unit is crucial for:
✅ Comfort – Keeps your space at the perfect temperature year-round
✅ Efficiency – Avoids overworking your system and wasting energy
✅ Longevity – Maintains warranty conditions and extends your unit’s life
✅ Savings – Reduces electricity bills
📏 How to Choose the Right Size
Each air conditioner is designed to handle a certain square metre area.
- Too small → Works overtime, struggles to reach temperature, costs more to run.
- Too large → Cools too quickly without removing humidity, leaving your space cold but clammy.
🏡 The Four Installation Classes
| Class | Home Type |
|---|---|
| A | Fully insulated roof/walls, brick or brick veneer, shaded windows, temperate climate |
| B | Insulated roof, brick/brick veneer, average windows with internal shades, north-facing, temperate climate |
| C | Insulated roof, brick/brick veneer, internal shades, east-facing, sub-tropical climate |
| D | Little/no insulation, weatherboard/fibro, large unshaded west-facing windows |
📊 Air Conditioner Sizing Guide
| Capacity | Cooling A | Cooling B | Cooling C | Cooling D | Heating A | Heating B | Heating C | Heating D |
|---|---|---|---|---|---|---|---|---|
| 2.5kW | 25sqm | 21sqm | 18sqm | 15sqm | 34sqm | 28sqm | 24sqm | 20sqm |
| 3.5kW | 35sqm | 29sqm | 25sqm | 21sqm | 40sqm | 33sqm | 29sqm | 24sqm |
| 5.0kW | 51sqm | 43sqm | 36sqm | 30sqm | 58sqm | 48sqm | 41sqm | 34sqm |
| 6.0kW | 60sqm | 50sqm | 45sqm | 37sqm | 68sqm | 57sqm | 48sqm | 39sqm |
| 7.0kW | 71sqm | 59sqm | 51sqm | 42sqm | 80sqm | 67sqm | 57sqm | 47sqm |
| 8.0kW | 80sqm | 67sqm | 57sqm | 47sqm | 89sqm | 73sqm | 64sqm | 52sqm |
| 9.5kW | 95sqm | 78sqm | 68sqm | 57sqm | 105sqm | 87sqm | 76sqm | 60sqm |
🛠 Example – Bedroom Size
A 4m x 4m bedroom = 16sqm
- Class A/B → 2.5kW split system
- Class C/D → Consider 3.5kW for better performance and energy efficiency
💡 Tip: The right size unit means better comfort, lower running costs, and a longer-lasting system.
📞 Need help choosing? Call AC Store on 07 3204 1400 or send us your floor plan for a free, expert sizing recommendation.
