Reduce heat loss and running costs, and improve air quality with HRV ventilation.
Houses built many years ago were so leaky that the question about the need for fresh air never arose. They had high heat loss in winter and heat gain in summer. Therefore, they were difficult and expensive to heat and cool.
Modern homes are built to a much higher standard and made more air tight to reduce heat loss in winter and heat gain in summer. Therefore, they have a greater need for Heat Recovery Ventilation (HRV) to keep them well ventilated.
- Southern and inland Australian climates generally have low humidity so HRV systems are approriate. They transfer dry heating or cooling (sensible heat) from the outflow air to the inflow air.
- In northern climates, high summer humidity (latent heat) is a big issue. Therefore, Energy Recovery Ventilation (ERV) is appropriate. ERV systems reduce the humidity in the incoming fresh air.
The need for fresh air in modern homes
- HRV systems are becoming more popular with modern home design as air tightness increases.
- Homes with high thermal performance are very air-tight. If the Star Rating is more the 7, HRV is essential.
- Your home will feel fresh and airy from a higher rate of air change.
- 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.
Benefits of HRV & ERV ventilation systems:
• Improved air quality, 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.
- The simplest ventilation system is the decentralised 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. It then reverses to deliver this heating or cooling to the incoming air.
- A pair of decentralised ventilators will typically service an area of 50 m2. They can be grouped with up to 5 pairs working together.
- The centralised system uses a single indoor ventilation unit. It uses concealed ducting to distribute the fresh outside air throughout the house. At the same time, it draws in the stale inside air and expels that outside.
- Installing HRV or ERV ventilators reduces your heating and cooling loads. Therefore, you can reduce the size of your heat pump or air conditioner accordingly. This will save money on purchase and running costs.