What Size Ducted Air Conditioning Do I Need? — Sydney Calculator
Free sizing guide for Sydney homes · By home size, zone count, and suburb location
The correct ducted air conditioning size for your Sydney home depends on total floor area, number of zones, ceiling height, insulation quality, sun exposure, and most importantly — which suburb you're in. Sydney's western and north-western suburbs (Penrith, Campbelltown, Castle Hill) require significantly larger systems than coastal suburbs due to extreme summer temperatures.
Quick Size Guide by Home Type
2–3 bedroom home (100–150 m²): 10kW system, 2–3 zones
3–4 bedroom home (150–200 m²): 12.5–14kW system, 3–5 zones
4–5 bedroom home (200–280 m²): 14–16kW system, 5–6 zones
5+ bedroom home or acreage (280+ m²): 18–24kW system, 6–8 zones
Adjustment by Sydney Suburb Type
Western Sydney (Penrith, Campbelltown, Liverpool): add 15–20% to base size — these suburbs regularly exceed 45°C in summer
Hills District (Castle Hill, Baulkham Hills, Kellyville): add 10–15% — inland heat with no sea breeze
North Shore, Northern Beaches (Manly, Chatswood, Mosman): use base size — sea breezes moderate temperatures
Eastern Suburbs and Inner West (Bondi, Newtown): subtract 5% — ocean proximity keeps temps lower
Our technicians provide a precise recommendation at the free site inspection. Call 0421 941 317 or email quote@sydneyaircon.net to book.