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Mechanical Ventilation with Heat Recovery (MVHR)

Sometimes referred to as Heat Recovery Ventilation or HRV, our quality range of Counterflow and Rotar MVHR systems offer energy efficient ventilation to suit all budgets and house types throughout NI, Ireland and UK.

Airtightness is an increasing factor people consider when building a home in order to gain from the financial benefits of energy efficiency. Traditional ventilation methods such as window trickle vents and bathroom extractor fans are used by homebuilders, despite striving to create an airtight property. However, these ageing methods of traditional ventilation are often counterproductive to the quest for an airtight home.

In homes with low levels of airtightness, especially those seeking passive house certification, a ventilation system such as Mechanical Ventilation with Heat Recovery (MVHR) is required to bring fresh air into the home. An MVHR system is usually the preferred method in airtight homes as it extracts moist stale air and supplies fresh warmed filtered air into the house while recovering up to 95 per cent of the heat of the extracted air.

What is Mechanical Ventilation with Heat Recovery and what are the benefits?

Fresh air is continuously drawn into the home via a low energy heat recovery ventilation unit, located in the roof space/utility area of the home. The ventilation unit filters the incoming air to remove pollutants and insects. Once passed through the heat exchanger within the ventilation power unit, the warm, clean, fresh filtered air is distributed around the home through a series of ducts which are run to each habitable room i.e. living room, bedroom etc. 



The air from wet rooms i.e bathrooms, kitchens, wc’s, utility areas etc is continuously extracted and filtered back through the ventilation unit. The heat from the extracted air is transferred to the fresh incoming air. The heat recovered can off-set the heating costs and will reduce fuel bills. The system provides low energy balanced continuous ventilation without the need for extract fans or window vents, ensuring a draught-free living environment.

Our AXCO range of quality HRV systems are designed to recover up to 95% of the heat normally lost through open windows, trickle vents and other break-out points i.e extractor fans in a building structure. 


On consecutive hot summer days when the MVHR system is in summer bypass mode (i.e when not exchanging temperature from extracted air) it will provide extraction of the stale, moist air and replace it with fresh air from outside at whatever the temperature is outside. On hot days in high summer, the ventilation speeds can be increased to summer boost and will create up to 40% more supply and extraction rates. This, added to opening windows, will create cross ventilation and will aid internal heat reduction. 

  • Constant clean, fresh filtered air reduces symptoms for asthma and allergy sufferers
  • Improves indoor air quality throughout the home
  • Excellent Heat Recovery provides positive enhancement of energy efficiency in the home
  • Enhances heat distribution
  • Complete condensation control throughout
  • Eliminates mould & mildew
  • No need for window trickle vents or extractor fans.
  • Constant change of air without draughts
  • Removes musty odours
  • Quiet in operation
  • Economical to run
  • Aids Radon Dispersion

We have a wide range of MVHR systems available to suit every lifestyle, house type and budget, including Counterflow Heat Recovery Ventilation and Rotar Technology, and PassivHaus approved. 

With 40+ years experience in the self-build market, we understand the advancements in construction and the emphasis on 'green building' methods. Our experienced technical team have an extensive knowledge of all current building regulations and work closely with architects and contractors.

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