As UK homeowners look for ways to improve energy efficiency and indoor air quality, many wonder whether they can install Mechanical Ventilation with Heat Recovery (MVHR) in an existing home. Traditionally, MVHR was associated with new builds, but advancements in technology now make retrofitting MVHR into older properties a viable option.
As UK homeowners look for ways to improve energy efficiency and indoor air quality, many wonder whether they can install Mechanical Ventilation with Heat Recovery (MVHR) in an existing home. Traditionally, MVHR was associated with new builds, but advancements in technology now make retrofitting MVHR into older properties a viable option.
Whether your home suffers from condensation, mould, poor air quality, or heat loss, MVHR offers a solution that improves ventilation while retaining warmth. Retrofitting requires careful planning, but when done correctly, it can transform the comfort and efficiency of an older home.
This guide will explain how MVHR retrofits work, the benefits, challenges, and key factors to consider.
For expert MVHR retrofitting services, visit https://www.climateworks.co.uk/heat-recovery.
Many older homes were built with natural ventilation, relying on chimneys, draughts, and air bricks to allow airflow. However, as homeowners upgrade their homes with double glazing, insulation, and draught-proofing, these traditional ventilation pathways become blocked.
This creates several problems:
Installing MVHR in an existing home solves these issues by removing stale, humid air and supplying fresh, filtered air while recovering heat.
With the UK tightening building regulations, mechanical ventilation is becoming essential in homes undergoing significant renovations.
If you’re upgrading insulation, replacing windows, or sealing gaps, retrofitting MVHR can help maintain the necessary airflow and compliance with building regulations.
Unlike traditional extractor fans, MVHR balances airflow throughout the entire home while maintaining energy efficiency.
✔ Older properties may require custom duct routes in ceilings, floors, or boxed-in sections.
✔ Homes with lofts or underfloor voids have more flexibility.
✔ Low-profile MVHR systems are available for tight spaces.
✔ Best placed in utility rooms, lofts, plant rooms, or large cupboards.
✔ Compact units exist for homes with limited space.
✔ Fire-rated ducting may be required in multi-storey properties.
✔ Acoustic insulation prevents noise transfer between rooms.
✔ Retrofitting costs vary based on property size, complexity, and existing airflow issues.
✔ Typical costs range from £5,000 to £15,000, depending on installation challenges.
✔ Extracts moisture before it can settle on windows and walls.
✔ Reduces humidity levels, preventing mould growth in bathrooms and bedrooms.
✔ Recovers up to 90% of heat that would otherwise be lost.
✔ Reduces reliance on central heating, cutting energy costs.
✔ Constant supply of fresh, filtered air.
✔ Removes dust, allergens, and outdoor pollution, ideal for homes near busy roads.
✔ Modern MVHR units are designed to run quietly.
✔ Eliminates the need to open windows for fresh air, improving security and reducing noise pollution.
✔ Period properties undergoing renovations that need improved ventilation.
✔ Homes with airtight upgrades, such as insulation and new windows.
✔ Homes suffering from persistent condensation and mould issues.
✔ Houses near busy roads, where outdoor air pollution is a concern.
✔ Energy-conscious households looking to cut heating costs.
✔ A professional survey assesses:
✔ Ducting is installed in ceilings, walls, or under floors.
✔ Alternative options like wall-mounted MVHR units are available for homes with no duct space.
✔ The main unit is placed in a loft, plant room, or cupboard.
✔ Extract and supply vents are discreetly placed in rooms.
✔ Airflow rates are adjusted for optimal ventilation in every room.
✔ Homeowners are shown how to operate and maintain the system.
✔ Small to medium homes: £5,000 – £8,000.
✔ Larger or complex properties: £9,000 – £15,000.
Factors affecting cost:
✔ Specialists in retrofitting MVHR into existing homes.
✔ Tailored solutions for different property sizes and layouts.
✔ Fully certified engineers ensuring compliance with regulations.
✔ Quiet, energy-efficient designs minimising disruption.
✔ Full aftercare and maintenance support.
To find out more about how MVHR can work in your home, visit https://www.climateworks.co.uk/heat-recovery.
Dr. Julian Carter is a highly experienced thermal systems expert with over 15 years in the field, holding a PhD in thermal systems. His career spans academic research, consulting, and teaching, focusing on air conditioning and refrigeration systems. Dr. Carter bridges the gap between theoretical advancements and practical applications, providing expert insights to organisations like ClimateWorks, where his guidance informs decision-making and industry best practices. Notably, he has worked on international projects with organisations such as Daikin Industries, the International Institute of Refrigeration (IIR), and the United Nations Environment Programme (UNEP). Currently a lecturer at Edinburgh University, Dr. Carter combines his expertise with a passion for educating the next generation of engineers and advancing climate control technologies.
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