Heat Recovery – Ventilation

Heat recovery ventilation, also known as HRV, provides fresh air and improved climate control, while also saving energy by reducing heating requirements.  Using mechanical ventilation systems, air is introduced into the building from a source of higher temperature thereby providing the necessary fresh air input PLUS free heating.

The three main methods used for HRV are :

  • Source fresh air from a roof space which has been heated by the sun.
  • Source fresh air from a roof mounted solar air panel which harvests energy from the sun.
  • Reduce the amount of loss by recovering heat from the air being exhausted out (heat exchange).


As building efficiency is improved with insulation and weather stripping, buildings are intentionally made more airtight, and consequently less well ventilated. Since all buildings require a source of fresh air, the need for HRVs has become obvious. While opening a window does provide ventilation, the building’s heat will then be lost in the winter and gained in the summer, both of which are undesirable for the indoor climate and for energy efficiency. HRV introduces fresh air to a building and improves climate control, whilst promoting efficient energy use.


Pellet Fires Tasmania builds and installs the WarmNdry ventilation system which harvests heat from a roof space or a solar panel during the day which can provide a substantial amount of free heating during autumn and spring.  During winter the solar gain expected will temper the incoming air so that the home does not become cold as a result of ventilation. Please see the WarmNdry product page for more information.

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