Find the right kW for your space in 30 seconds. Built for Sydney homes.
What Size Air Conditioner Do I Need?
Free Sizing Tool
What Size Air Conditioner Do I Need
for My Room or Home?
Put in your room size, ceiling height, and a few details about your home. The calculator gives you a kW recommendation using the same heat-load method we use on every site visit.
Works for split systems and ducted. Covers single rooms up to full open-plan homes. Takes about 30 seconds.
The number is a solid starting point. If your room has unusual features like massive west-facing windows, a double-height void, or a tin roof with no insulation, book a free quote and we will nail it properly on site.
Getting the size right matters. A unit that is too small will run flat out and never get the room cold. A unit that is too big will short-cycle, turning on and off constantly, which wastes power and does not dehumidify properly.
Star ratings and brand comparisons come after you get the kW right. If you size correctly and then pick a good brand, you will be happy with the system. If you get the size wrong, no amount of stars will fix it.
Ready for a fixed price? Get a split system quote online or call us for ducted.
Air Conditioning Size Calculator
Adjust the inputs below. Your recommended capacity updates in real time.
Only count the rooms you want conditioned. Skip garages, bathrooms and laundry unless you plan to condition them.
Not sure? A typical 3-bed Sydney home is 130–170 m². A large 4-bed double-storey is 220–280 m².
Zone setup
Zoned ducted systems rarely run every zone at once — we size the unit for how you actually use it.
Most Sydney homes run 60–75% of zones simultaneously (e.g. 3 of 4 in the evening).
If it's a concrete-slab ceiling (apartment), select "Insulated".
Minimum capacity
Based on a 20 m² room on a split system.
Quick reference guide
A rough rule of thumb for common Sydney room sizes.
- Bedrooms
- Small study
- Small lounge
- Master bedroom
- Small kitchen/diner
- Home office
- Large lounge
- Large bedroom + ensuite
- Mid open-plan
- Large open plan
- Kitchen + dining + lounge
- Small shop / office
FAQ
Sizing Questions Answered
It uses the same heat-load method our installers use on first visit and lands within 10% for most Sydney homes. For very unusual spaces (double-height voids, glass houses, commercial), we’ll fine-tune on a site visit.
Air conditioners cool a volume of air, not an area. A 20 m² room with a 3.5 m ceiling has 30% more air to condition than one with a 2.4 m ceiling.
Zoned ducted systems don’t need capacity for every zone running at once. We ask how many zones you typically run simultaneously (e.g. 3 of 4 in the evening) and size the outdoor unit for that real-world usage — smaller unit, better efficiency, lower running cost.
No — oversized units short-cycle, use more power, don’t dehumidify properly and leave the room clammy. Right-sizing is the single biggest comfort decision.