Passivhaus Affiliate

Research Report - The Case for MVHR

Category: Guidance

The Case for MVHR, Passivhaus Trust, 2020


The case for MVHR

Published: April 2020



There is a preconception that MVHR systems are only effective in more airtight buildings.  As a result, MVHR systems remain relatively niche in the UK, with most dwellings still being fitted with trickle ventilation and single room extract fans. In particular, MVHR systems are rarely fitted in retrofits unless particular attention has been paid to improving airtightness.

This paper seeks to challenge this convention, demonstrating that the perceived need for high levels of airtighness is based on outdated assumptions, and suggests that MVHR systems are, in fact, desirable in nearly all domestic situations, either new-build or retrofit.


Moisture and EnerPHit Good Practice Guide. PHT publication January 2024


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