Ventilation systems

The majority of New Zealand homes are ventilated passively (i.e. opening windows and doors) and/or through infiltration of outside air through the building envelope.  Mechanical ventilation systems are increasing in popularity either as a remedy to condensation problems or as an addition to a modern energy efficient home.

There a many different ventilation types on the market today.  Right House only recommends the use of true heat recovery ventilation systems.

How it Works

The majority of ventilation systems sold in New Zealand force air from the attic cavity into the home, relying on positive pressure to force existing air in the home out through gaps in the building envelope.

True Heat Recovery Ventilation systems bring in fresh air from outside while at the same time drawing internal air from various points within the home.  These two air streams then cross each other in a heat exchanging unit.  The cooled internal air is then exhausted outdoors while the warm fresh air is supplied throughout the house.

What to Consider

Because most ventilation systems are generally installed in the attic cavity there must be sufficient space to accommodate the ventilation unit and associated ducting.  Similarly the access to the attic cavity must be sufficiently large to allow the ventilation unit to pass through.  There is some visual impact associated with the supply and return grills located throughout the house, often in the ceiling.  There will also be some power consumption associated with the fans.

Why it’s good

Ventilation in a structure is needed for removing water vapor, produced by respiration, showering and cooking.  If water vapor accumulates it will often condense on windows and other cold surfaces within a home.  Mold growth and structural damage can occur in homes that regularly experience condensation.  True Heat Recovery Ventilation will help remove moisture from the air while retaining the majority of the heat.

How much will it cost

The cost of installing a True Heat Recovery Ventilation system will depend on the extent of duct work required.  The cost of a system in a typical three bedroom home is approximately $5000 to $6000.

To obtain a quote for your home contact a Right House Sales Consultant.