"AHHAC delivered our 22-zone underfloor system on time, on budget and to spec. The crew were tidy, the documentation was thorough, and the commissioning was textbook."

Reverse-cycle split, multi-split and ducted air conditioning — including the new MAXA Total-One, which cools, heats AND makes your domestic hot water from one system. Paired with hydronic where it makes sense, supplied where ducted is the right call.
Air conditioning in Sydney is best handled by an inverter reverse-cycle system: a split for single rooms, a multi-split for several rooms from one outdoor unit, or ducted for whole-home cooling. AHHAC supplies and installs Mitsubishi, Daikin, Fujitsu and Panasonic systems, plus the MAXA Total-One, which runs up to three indoor heads and heats a 190-litre hot water cylinder at a COP of up to 3.9, so one system covers cooling, heating and hot water.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
AC isn't always the answer — but sometimes it is. We supply and install reverse-cycle split systems (single-room), multi-splits (multi-room from one outdoor unit), and ducted systems for whole-of-home cooling. Mitsubishi, Daikin, Fujitsu, Panasonic.
We're equally happy to recommend hydronic cooling instead, and we'll be honest about which suits your project better.
The MAXA Total-One is a revolutionary new system that does three jobs from one compact plant: air conditioning, heating AND domestic hot water. A single-phase inverter outdoor unit drives up to three indoor hi-wall heads and charges an integrated 190-litre stainless steel hot water cylinder.
Because it's a thermodynamic heat pump (COP up to 3.9) rather than a 1:1 electric element, it makes hot water for a fraction of the cost of a traditional electric tank — an estimated saving of around $874 a year on a typical Sydney home. In summer its Total Energy Recovery Circuit redirects the heat pulled out of your rooms straight into the hot water tank, so your hot water is effectively free while you cool. Hot water to 55 °C, low-GWP R32 refrigerant and whisper-quiet 26 dB(A) indoor heads. See the MAXA Total-One page (linked opposite) for full specs and pricing.

One compact system for cooling, heating and domestic hot water. Inverter outdoor unit + up to 3 indoor heads + integrated 190 L cylinder, COP up to 3.9 — with effectively free hot water in summer via energy recovery.
Most air conditioning complaints we hear in Sydney are not about the brand. They come from a unit that is the wrong size, in the wrong place, or installed without the right approvals. Here is what we check before we quote.
Reverse-cycle split systems are the cheapest way to cool one or two rooms. For a whole home, especially where someone suffers from allergies or dislikes draughts, we often recommend hydronic cooling through fan coils or underfloor instead. And if you also need new hot water, the MAXA Total-One combines up to three indoor heads with a 190-litre cylinder, which can make more sense than buying an AC system and a separate hot water unit.
Compare the options on our ducted vs hydronic heating page, read the full specifications on the MAXA Total-One page, or see how hydronic cooling in Sydney handles humid summers without the draughts of a ducted system.
Written from on-site experience by the AHHAC Technical Team.
AHHAC's in-house design and service team — licensed plumbers and hydronic engineers (Lic 262528C) who have designed and installed 2,400+ hydronic heating, cooling and hot water systems across Australia since 1998.
We only specify equipment after a heat-loss and system-compatibility check, then supply, install and commission it with our own licensed plumbers to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), register the manufacturer warranty and service it for the life of the system.
Yes — the new MAXA Total-One. One compact system provides air conditioning, heating and domestic hot water: a single-phase inverter outdoor unit drives up to three indoor hi-wall heads and an integrated 190-litre hot water cylinder, at a COP of up to 3.9. In summer it recovers the heat from cooling to make your hot water almost free. See our MAXA Total-One page for full details.
Splits: cheaper per room, single-room control, easier to install. Ducted: invisible at room level, single thermostat option, better aesthetic. Multi-splits split the difference. We'll spec based on layout, budget and aesthetic priorities.
Mitsubishi Electric (premium, quietest), Daikin (workhorse reliability), Fujitsu (good value), Panasonic (mid-range). We hold service relationships with all four — including extended warranty registrations.
Sometimes — if the indoor unit is recent and uses compatible refrigerant. Often it's better to replace both because newer outdoor units use newer refrigerants. We'll inspect and quote both options.
"AHHAC delivered our 22-zone underfloor system on time, on budget and to spec. The crew were tidy, the documentation was thorough, and the commissioning was textbook."
"We've worked with AHHAC for 17 years. They've installed and serviced our hot water plant across three commercial buildings — and they pick up the phone on weekends."
"Three mobs quoted us; AHHAC's design was the only one based on a proper heat-loss calculation. The system runs beautifully — the others would've been oversized and expensive."