Guides
MVHR guides and advice
Straight answers from working MVHR engineers.
What is MVHR? How Mechanical Ventilation with Heat Recovery works
A plain-English guide to MVHR: what it is, how heat recovery works, where it is fitted, and what maintenance it needs.
5 min read
How much does an MVHR service cost in London?
What an MVHR service costs in London, what's included and what changes the price. Our service starts from £140.
4 min read
How to change MVHR filters (step by step)
A safe step-by-step guide to changing the filters in a typical MVHR unit, including filter grades and how often to do it.
4 min read
Condensation and mould with MVHR — what's going wrong?
If you have MVHR and still see condensation or mould, the system is probably not performing. Here are the common causes and what to check.
4 min read
Why is my MVHR noisy? Causes and fixes
Humming, whistling or rattling from your MVHR? These are the common causes and what an engineer will check.
3 min read
MVHR not working? What to check before you call an engineer
Simple checks if your MVHR has stopped, shows a fault, or isn't moving air — and when to call an engineer.
3 min read
Should you turn off your MVHR?
Why MVHR is designed to run continuously, what happens if you turn it off, and when switching off is acceptable.
3 min read
MVHR vs extractor fans vs PIV: which ventilation is right?
MVHR, MEV, PIV and extractor fans compared: how they work, what they cost to run and which type suits which home.
5 min read
Need an MVHR engineer in London?
Tell us the make of your unit and what's wrong. We'll confirm price and availability the same day.