MVHR systems extract stale air from wet rooms, supply fresh filtered air to living spaces, and recover up to 90% of the heat in the process. Essential for tight-built modern homes.
MVHR systems in Australia extract stale, humid air from kitchens, bathrooms and laundries, supply filtered fresh air to living areas and bedrooms, and recover up to 90% of the heat in the process. They suit airtight new builds, Passivhaus projects and high-performance renovations rather than older draughty homes. AHHAC designs and installs MVHR across Sydney, Melbourne and Brisbane, with F7 filtration, diffusers running under 25 dB and BAL-rated options for bushfire-prone sites.
Reviewed by the AHHAC Technical Team — licensed plumbers & hydronic engineers, NSW Lic 262528C.How we write & review
Modern Australian homes are increasingly airtight — which is great for energy efficiency but bad for air quality. CO2, humidity, VOCs from furniture and cleaning products, and cooking moisture all build up.
MVHR (Mechanical Ventilation with Heat Recovery) extracts stale air from kitchens and bathrooms, passes it through a heat exchanger that captures up to 90% of the thermal energy, and uses that energy to pre-warm or pre-cool incoming fresh air from outside.
MVHR systems succeed or fail at the design stage. The heat-recovery core does its job reliably; what goes wrong is everything around it, and nearly all of it is cheaper to fix on paper than through a finished ceiling. These are the decisions we settle with the architect and builder before the framing is closed in.
Climate changes the specification too. In Melbourne and Canberra winters, heat recovery is the main benefit. In humid Brisbane summers, an energy-recovery (enthalpy) core that also transfers moisture can stop the system bringing sticky outdoor air inside. A summer bypass lets cool night air in without passing it over the warm core, and BAL-rated options seal the intake during bushfire smoke events.
MVHR handles fresh air, not heating. It pairs naturally with low-temperature hydronic heating, which warms the fabric of the house while the MVHR keeps the air fresh and filtered. If you are planning hydronic cooling, controlled ventilation also helps keep indoor humidity in check, which matters on chilled surfaces. See our heat recovery ventilation units for the equipment, and our eco-friendly heating and cooling overview for the whole-house approach.
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.
Every plumbing and hot water job is assessed on site, carried out by our own licensed plumbers and gasfitters to AS/NZS 3500 (plumbing) and AS/NZS 5601 (gas), pressure-tested and documented, and backed by ongoing service. Nothing is subcontracted out.
Essential for tight-built modern homes — Passivhaus, certified high-performance builds, and any home with a high-quality envelope. Older draughty homes don't need it. We'll assess your home's airtightness before recommending.
Up to 90% of the heat in extracted stale air is recovered and used to pre-heat incoming fresh air. In a tight, well-insulated home this can cut total heating energy by 15–25% compared to natural ventilation losses.
MVHR units include F7 + G4 dual filtration that removes pollen, dust and most particulate matter. Bushfire-rated (BAL) options seal external air during smoke events. We've installed many for asthma sufferers and clients in bushfire-prone areas.
"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."