Yes, you can cool your home through the floor too. Here's why architects and demanding homeowners are increasingly specifying it.
Underfloor cooling circulates chilled water at 8–14 °C through the same floor pipework used for hydronic heating, lowering the floor surface to about 19–21 °C so it quietly absorbs heat from people and the room, with no fans, draughts or recirculated dust. It suits well-insulated homes and pairs with a fan coil and dew-point sensor for humid or very hot days. AHHAC designs underfloor cooling in Sydney and across NSW, VIC, QLD & ACT.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
Underfloor cooling works by circulating chilled water (8–14°C) through the same pipework that delivered heating in winter. The floor surface drops to about 19–21°C — gently absorbing radiant heat from your body and the room.
It's not as fast or aggressive as ducted cooling — but for many Australian homes, it's actually preferable. No fans, no draughts, no allergens.
Underfloor cooling shines in well-insulated homes with controlled humidity. It's perfect for: bedrooms, libraries, home offices, bathrooms, and any space where you value silence over rapid temperature change.
We pair it with a small fan-coil dehumidifier and a dew-point sensor to prevent any condensation issues.
Underfloor cooling behaves differently from air conditioning, and owners who know what to expect get far more out of it. These are the points we walk every client through at handover.
Underfloor cooling is a baseline, not a blast. In a well-insulated home it covers most summer days on its own; in homes with large glazing or hot western exposure, we size a fan coil for peak afternoons so the floor never has to do more than it can.
See hydronic cooling in Sydney, the hydronic cooling explainer, and how thermostats and controls handle the changeover between heating and cooling.
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 design benefits of underfloor cooling from a room-by-room heat-loss calculation, install it with our own licensed plumbers to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), commission and document it, and service it for the life of the system. Nothing is subcontracted out.
No — there's no air movement at all. The floor surface drops to about 19–21°C and gently absorbs radiant heat from your body and the room. It feels comfortable, not breezy.
For well-insulated homes with modest cooling loads, yes. For larger cooling demands (hot Sydney summers, exposed western glazing) we pair underfloor cooling with a small fan-coil unit for peak-day boost. Most days, underfloor alone is sufficient.
Significantly better — no air recirculation means no dust, mould spores or pet dander pushed through every room. Asthma and allergy sufferers consistently report dramatic improvement after switching from ducted AC to hydronic cooling.
"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."