ERV or HRV Ventilation

The need for fresh air in modern homes

  • Houses built many years ago were so leaky that the question about the need for fresh air never arose
  • Modern homes are built to a much higher standard and made air tight to prevent heat loss or gain
  • Consequently, energy or heat recovery ventilation is becoming popular with modern home design
  • For high quality air-tight homes with 7+ Star rating, energy or heat recovery ventilation is essential
  • Your home will feel fresh and airy from a higher rate of air changes
  • The heating or cooling in the stale outflow air is transferred to the fresh inflow air
  • A poorly ventilated home will make you feel drowsy, give you headaches or worse

Heat recovery (HRV) & energy recovery (ERV) ventilation

  • Southern and inland  Australian climates generally have low humidity so HRV systems are relevant transferring dry heating or cooling (sensible heat) from the outflow air to the inflow air
  • In northern climates, high summer humidity (latent heat) is the issue, and an ERV system will reduce the humidity in the incoming fresh air

Benefits of HRV & ERV ventilation systems:

• Improved quality of air, makes your home feel fresh and airy
• Reduces airborne allergens such as pollen, pet dander, dust mites and mould
• Makes your home more hygienic
• Lowers your heating and cooling costs (can be up to 25% saving in an air tight home)
• Improves your home’s energy rating
• Reduces the size and cost of your heat pump &/or air conditioner (both capital and operating)
• Installation is easier than a similar sized air conditioner
• An ERV ventilation system additionally reduces excess moisture that could lead to mould formation.

Centralised and Decentralised Ventilators

  • The simplest ventilation system is a centralised HRV system, sold in pairs
  • One ventilator pushes whilst the other pulls air across a ceramic plate transferring the heating or cooling energy for about a minute then reverses to deliver this heating or cooling to the incoming air
  • A pair of LT-50 ventilators will typically service an area of 50 m2 and can be grouped with up to 5 pairs linked together working in unison
  • The decentralised system uses a single indoor ventilation unit with ducting that draws in fresh outside air and expels the stale inside air moving this air throughout your home in concealed ducting
  • Installing HRV or ERV ventilators allows you to reduce the size of your heat pump or air conditioner which saves on both purchase and running costs