An HRV home ventilation system fills your home with drier, filtered air and is great for reducing moisture levels in your home (that cause pesky condensation) – and reducing the conditions mould and mildew need to grow. Drier air is quicker and more efficient to heat too.
HRV might not be right for all homes. Book a free home assessment to find out if it's right for you.
HRV home ventilation
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HRV Core Ventilation System Medium
1x Core Ventilation system (medium)
The Arizona 4 home ventilation system suits medium homes (e.g. living room and 3 bedrooms). Your system will be designed to fit your home and deliver up to 3 air changes per hour via diffusers in bedroom and living areas.
Activities like cooking dinner and washing clothes create moisture. HRV home ventilation reduces that moisture and provides a constant supply of filtered air. Drier air also helps make your heaters work more efficiently. A central filter reduces common airborne asthma and allergy triggers from incoming air. To see if HRV home ventilation suits your home* and get a comprehensive quote, book a free home assessment.
*HRV home ventilation needs a dry roof space and other criteria to work properly – we’ll only recommend it if your home is suitable.
HRV ventilation might not be right for all homes. Book a free home assessment to see if it's right for you.
Take a look here for a quick overview of how the system works and how to use it to best advantage at your new place. For more in depth advice on changing settings, take a look at the manual, or talk to our Customer Service team if you have any questions – 0800 HRV 123 or .
In some homes, the air passing out of the outlets across the ceiling will cause a static charge to build up. This can cause a build up of household dust from inside the room attracted by the static charge. Simply wipe away the dust ring with a dry cloth or soft brush, then turn the diffuser plate of the vent open a little further to help stop this from recurring. If this continues, give us a call on 0800 HRV 123 and we can arrange a visit by one of our Customer Service team.
Pressing the Burnt Toast Mode button on your control panel switches your system to maximum ventilation for one hour. To return your system to its previous setting before the hour is up, just tap the button again. By forcing air and maximising air movement this can assist with clearing bad smells and clearing excess moisture on walls and windows.
To find out more about the Filter Change and Service click here.
The Ventilation Level can also be increased during the day to minimise condensation – and reduced at night if desired. The aim is to achieve the right balance between minimisation of condensation and maintaining comfort in the house.
Option 47 is also a good option to set, this will detect a cold house and if below the temperature set on this option the system will move more air (Maximise Air Movement)
If you have the latest HRV Touch Pad, the installer will set these for you and you won't need to change them as your system will do this automatically. For more information on older systems call our Customer Service team on 0800 HRV 123
1. Condensation (Air, moisture and temperature related)
2. Temperature too hot or cold
4. ‘Steam ups’
5. Kitchen fumes
Having a healthy dry environment requires a combination of Air movement (HRV) heating and extraction of moisture. Insulation Is also helpful for retaining temperature once introduced.
It not unusual to have adequate air movement and still have some condensation. This is commonly due to the occupants of the home not well managing internal moisture whether it be in the roof, house or sub floor.
In some cases, water generated within the house or roof cavity is too much for the HRV to handle, e.g. drying clothes inside on a wet day. The homeowner needs to look for ways to reduce water in the house, roof cavity and sub floor:
1. Stop any leaks in the roof
2. Ensure spouting flows freely and there is no pooling of water in guttering
3. Drain away any pooling water under or around the house (drain it away from the house)
4. Vent Extraction for wet areas – bathroom, kitchen and laundry - (vent to outside and preferable on a timer to ensure all moisture has been extracted)
5. Don’t dry washing inside the house
6. Gas heating must be flued to the outside
7. Externally flue the clothes drier
Maximise Air Movement
The HRV can also be “driven” to minimise the effects of the moisture by using Burnt Toast Mode. Burnt Toast Mode forces the HRV to run at full fan speed.
Example of use:
• Bath time for kids (high moisture time) - use an extractor fan in wet areas to remove most of the moist air to outside. At the same time, put the HRV on Burnt Toast Mode. This may bring the house temperature down slightly in winter, so after bath time stop Burnt Toast Mode and add heating to bring the house back up to temperature. Normal HRV settings will then handle any moisture.
Adding temperature is an effective way of supporting the ventilation system to manage internal moisture.
By adding temperature, you lower the relative humidity meaning in simple terms the air in your home can hold this moisture rather than letting it condensate onto furnishings and windows.
Once the Air is warmed up the ventilation system will slowly help to positively move this moisture laden air out of the home.
If you have any questions, please give us a call and we can look at your settings in greater detail.
Summary for condensation control–
1. A home needs to have adequate air movement to encourage drying
2. Adequate extraction of moisture at the source
3. Suitable heating to lower humidity and holds the moisture
4. Insulation to support with efficacies of the above
Fan runs at 5% air volume change per hour (the minimum required to prevent condensation)
This causes a maximum of 1-degree change in temperature
Homeowner can add heat (noting that dry air is up to 4 times more efficient to heat than damp air)
When on, the HRV system will detect summer and winter conditions and will disable cooling in winter and heating in summer. After installation it can take up to 24 hour for the controller to decide if it is summer or winter. This can now be found in user quick options.
Note: The vent symbol will flash if energy saver mode is blocking heating or cooling, due to the season detected.
Drafts are felt for two main reasons:
1. Air flow
2. Temperature difference between room temp and roof cavity air.
To reduce drafts:
• Lower the ventilation level
• Raise the set temp (in winter)
• Lower the set Temp (in summer)
• Add directional collars (direct the air away from people)
2. STEAM UPS
A Steam Up is very rare. It occurs when so much moisture is being drawn in from the roof cavity by the HRV that it condenses on the walls of the house. Several factors can cause excessive moisture in the roof cavity, e.g.:
• Blocked guttering
• Damp insulation
• Tiled roofs with no building paper
• Moisture under house rising through wall cavities to the roof cavity
The homeowner needs to eliminate the above to avoid Steam Ups. In addition, the owner going away and leaving the house empty has been known to cause Steam Ups, as while they are away no heating is being used.
The following option setting may help:
Option 47 - Detect Cold House
This is now a settable temperature, for detecting ‘cold’ houses. The default is now 0 (off). The range is 0 (off), or 12 to 20 degrees. Setting option 47 back to 18 degrees gets rid of a lot of Steam Ups. The reason for this is because it is unknown at the time of installation whether the house is a ‘cold’ house.
Heat Transfer Kit
In winter, some people choose to only heat some areas of the home – often meaning warm living areas but cold bedrooms! The HRV Heat Transfer Kit helps with this problem by using its centrifugal fans to push warmer air generated from a large heat source, i.e. a fireplace, into other areas of your home, balancing the temperature throughout. The HRV Heat Transfer Kit is compatible with our Next Gen Ventilation Systems.
The HRV SummerKit draws air from the southern side of your home and delivers more ventilation, more often to keep the air moving on those hot, sticky summer nights. The HRV SummerKit is an optional add-on to your HRV Ventilation System and is compatible with most models (excluding HRV Lite).
Vortex extractor fan
If your bathroom or laundry needs some extra moisture removal oomph, a Vortex extractor fan could be a great option. The Vortex extractor fan can be installed in the ceiling and is ventilated outside to help reduce moisture in your bathroom or laundry. A Vortex extractor fan can also be paired with an optional HRV IntelliSwitch which is an automatic timer to allow your extractor to do its job and then automatically switch itself off, even when you’ve left for work.
Our Sonair system is designed to provide filtered air to single rooms within homes and apartments that don’t have a roof cavity. Your Sonair unit is wall mounted and offers a single-room ventilation option.
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