HVAC systems are an air filtration device which can mechanically ventilate your home.  This is a requirement in new builds where a low carbon / zero carbon build is required and due to the air tightness of the property will provide fresh pre-heated air into the house.  This will help provide your home with fresh air and help stop condensation gathering which could lead to mildew in low energy homes.


A whole house ventilation unit, it extracts warm moist air from all wet rooms via ducting to cross flow heat exchanger inside the unit. It then draws in fresh air from outside supply’s through the heat exchanger into all habitable rooms.

The HVAC system (also known as MHRV) is required to help stop damp and provide fresh air ventilation without drafts and heat loss associated with opening windows throughout the day.  This air can be filtered to a HEPA standard.  This can be advantageous with people building new properties in the countryside who suffer from hay fever.

This system means you no longer require trickle vent, extraction fans in bathrooms.


The concept of modern homes that were self-sufficient in terms of their energy use had been limited to a handful of ‘autonomous houses’, designed, built and occupied by enthusiasts, until now.

Solarfix are proud to offer MHRV as part of a complete package which includes:

  • Solar PV

  • Energy storage

  • Heat pumps

  • Underfloor heating

While prices vary considerably depending on your situation & requirements, £4500 - £5500 depending on house size.

Air Tightness Testing

In an airtight house the movement of air is controlled by a heat recovery ventilation system. If air movement is not controlled air quality can be unpredictable. Airtightness could also be referred to as the lack of draughts in a house.

In winter in a draughty building air may come in at 3 degrees centigrade. A comfortable indoor temperature is 21 degrees centigrade. The homeowner has to pay to heat that air. A good level of air tightness will mean that only the right volume of air will have to be heated. Similarly an air tight building will not let warm air escape.

Our heat recovery installation will also include the air-tightness test which is a building control requirement for a new build house.


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