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Renewables Mechanical Ventilation with Heat Recovery (MVHR)

What is MVHR?

Mechanical Ventilation with Heat Recovery, also known as Heat Recovery with Ventilation, is an energy efficient ventilation system that keeps your home fresh, warm and healthier all year round.

Why use MVHR?

We designed our ventilation systems with the primary goal of recovering heat normally lost through conventional bathroom extractor fans and air supply vents. Our MVHR systems recover up to 95% of this previously lost heat, as well as improving air quality, preventing mould, naturally cooling your home in warm weather, and so much more.

How does MVHR work?

MVHR (or HRV) extracts the moist and stale air from all wet rooms in your home and replaces it, filtering fresh, warm air to all habitable rooms and bedrooms without letting heat escape. 

These systems keep your home air tight, so there’s no need for window vents or bathroom extractors. With as much as 95% of normally wasted heat being recovered, your fully ventilated home will not only provide a healthier and quieter environment, but also substantial energy savings! 

Maintenance of MVHR

A MVHR unit, like any other building service, requires maintenance and servicing throughout their lifetime to ensure consistent and energy efficient ventilation is provided.

Clean filters are key to Guaranteed Installed Performance, efficiency and indoor air quality and should be cleaned or replaced every 6-12 months. 

The heat exchanger is designed to last the lifetime of the unit, simply needing to be cleaned every 3 to 5 years with an antibacterial cleaner.

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Benefits of MVHR (Mechanical Ventilation with Heat Recovery)

Air Quality

Improves indoor air quality by filtering all incoming air, removes bad odours and helps with asthma and other health issues.

Circulated Air

Eliminates the need for bathroom extractor fans and window air vents, and prevents mould and condensation.

Natural Cooling

Provides natural cooling in warm weather by supplying fresh filtered air.

Efficient Heating

Evenly distributes heat throughout your home, recovering up to 95% of your normally wasted heat.


Building Control Compliant

Complies with all building control regulations.

It is possible to install to an existing house, but good planning and design is critical, If your house is a bungalow the installation would be very easy as all ductwork would be in your attic space but if your house has a number of floors we would have to work with you to provide solutions to drop ductwork to the rooms below through service voids like wardrobes and storage rooms.

We have installed systems to a lot of period houses and even a castle, you will not be able to achieve the maximum heat recovery rate of 90% but you will achieve almost all the advantages including fresh filtered air and condensation control.

Over the last decade there has been increasing demand on builders, architects and government legislators to increase the thermal efficiency of our homes making them draught free and well insulated. This in turn has caused poorer air quality which can significantly increase the effects of asthma and other respiratory problems, health problems, condensation, mould, dust mites, unpleasant smells and build-up of toxic gases.

For health reasons, recent legislation now makes it almost compulsory for your new air tight home to have a balanced mechanical ventilation system and a heat recovery ventilation system is the most preferred option.

Installing a heat recovery unit is quickly becoming a necessity rather than a lifestyle choice. On completion of the installation the system will require commissioning and we can help you with this or provide an installer local to your area to commission the system.

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