Sydney — Tier-1 Pillar

Sydney Ducted Heating & Cooling — Zoning, Roof Space, BASIX Compliance, Reverse-Cycle

Sydney ducted heating and cooling reality. Roof-space placement, zone-control strategy, BASIX Certificate impact on renovation, reverse-cycle vs gas ducted, heritage overlay grille placement. A$9K-A$22K typical.

~1 min read·Updated 2026-04-23

A Sydney ducted system runs from a roof-space-mounted air handling unit through zoned ducting to ceiling grilles. Reverse-cycle (heating + cooling on the same refrigerant circuit) is the prevailing technology since the 2020s — gas ducted heating has largely fallen out of new-build favour. Zone control via motorised dampers lets different rooms run at different times, dropping running costs by 30-50%.

Installation requires ARC-licensed refrigerant work, licensed electrician with CCEW, and (on renovations over A$50,000) BASIX Certificate compliance. Heritage Conservation Areas can restrict grille placement on visible ceilings — typically requiring slot-line diffusers or bulkhead concealment.

AskBaily routes your Sydney ducted install to an ARC-licensed specialist who designs zones, coordinates BASIX compliance, and handles heritage-sympathetic grille placement.

What a Sydney ducted install involves

Roof space. AHU placement requires 1.2 m head clearance. Insulated ductwork R1.0 minimum under BASIX.
Zoning. Motorised dampers per zone. Smart thermostat + wall pad control.
Electrical. Licensed electrician + CCEW. Dedicated 15-25A circuit depending on capacity.
Refrigerant. ARC-licensed installer.
BASIX. COP targets, refrigerant choice, ducting insulation.
Heritage. Grille placement restrictions on visible ceilings.

Frequently asked questions

Reverse-cycle or gas ducted? Reverse-cycle. Gas ducted heating is being phased out of new-build stock under NSW policy direction; running costs of reverse-cycle are lower on grid electricity with solar PV. Existing gas ducted can be retained but not typically new-specified.

How many zones should I have? One zone per 2-3 rooms is typical. Bedroom zone, living zone, and office zone is a common 3-zone setup. 5-6 zones is common on larger homes.

How much does a Sydney ducted install cost? A$9,000-A$13,000 for a 3-zone 10 kW system. A$15,000-A$18,000 for a 5-zone 14-16 kW premium system. A$20,000-A$22,000+ for larger homes with 7+ zones and premium equipment.

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“A string of bright beads of sunlight, breaking through the valleys along the moon’s rim.”

— Francis Baily, 1836

Origin

Who is Baily?

Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.

He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.

That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.

Baily was a businessman before he was a scientist. That’s our vibe too.

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