Installing an MVHR (Mechanical Ventilation with Heat Recovery) system is a crucial step toward improving indoor air quality and energy efficiency. However, improper installation can lead to poor performance, excessive noise, and higher energy bills. Many UK homeowners unknowingly make installation mistakes that reduce system efficiency by up to 40%.
Installing an MVHR (Mechanical Ventilation with Heat Recovery) system is a crucial step toward improving indoor air quality and energy efficiency. However, improper installation can lead to poor performance, excessive noise, and higher energy bills. Many UK homeowners unknowingly make installation mistakes that reduce system efficiency by up to 40%.
As new builds become more airtight to meet Net Zero targets, MVHR is essential for proper ventilation. The UK’s Future Homes Standard mandates low-carbon heating solutions, making correct MVHR installation a key factor in meeting sustainability goals. Poor installation can lead to:
A homeowner in Southampton installed an MVHR system in a new-build home. Within a few months, they noticed mould growth and stale air. An inspection revealed incorrect duct sizing, which restricted airflow. After replacing the ducts with properly sized ones, the system operated 30% more efficiently, eliminating mould and reducing heating costs.
Incorrect Duct Sizing – Undersized ducts reduce airflow, leading to inefficiency
Poorly Sealed Ducts – Air leaks cause heat loss, increasing energy bills
Placing Intake & Exhaust Too Close – Leads to stale air being recirculated
Ignoring System Balancing – Uneven airflow results in discomfort and higher energy use
Skipping Soundproofing – Poorly designed systems can be noisy, causing annoyance
Balanced ventilation for consistent airflow
Sealed ductwork to prevent heat loss
Quiet operation with insulated ducts
High-efficiency heat exchangers for maximum savings
Conduct a full home assessment before installation
Ensure professional duct sizing for optimal airflow
Choose high-quality components to prevent failures
Verify compliance with Part F building regulations
Properly installed MVHR units can save up to £300 annually by reducing heating demand. A well-maintained system can operate efficiently for over 20 years.
Clean or replace filters every 3–6 months
Inspect ducting for leaks annually
Book professional servicing every 2–3 years
Author BioDr. 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). These collaborations addressed energy efficiency, sustainable refrigerants, and advanced cooling technologies. 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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