MVHR (Mechanical Ventilation with Heat Recovery) units that supply filtered fresh air while recovering up to 90% of the energy from extracted stale air.
MVHR is a non-negotiable for tight-built modern homes — Passivhaus, certified high-performance builds, and any home with a high-quality envelope.
We supply Zehnder ComfoAir, Stiebel Eltron LWZ, Mitsubishi Lossnay and Brink Renovent. Sizing is critical — undersized units short-cycle, oversized units waste energy.
Essential for tight-built modern homes (Passivhaus, certified high-performance), homes with high indoor pollutant levels, asthma/allergy sufferers, and any home in bushfire-prone areas. Older draughty homes can usually skip it.
Zehnder ComfoAir (premium, quietest), Stiebel Eltron LWZ (German), Mitsubishi Lossnay (good value), Brink Renovent (Dutch). We size each unit to your home's air volume — undersized cycles too fast, oversized wastes energy.
Whisper-quiet — under 25dB at the diffuser on normal mode. The unit itself is mounted in a service area (laundry, garage, plant room) where you don't notice it. Boost mode (during cooking) is louder but still acceptable.
"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."