MVHR as air quality regulator.

Ak84

So I know that MVHR is not recommended unless you have excellent levels of air tightness.
But in terms of fresh air and regulating humidity would it be a good job in a solid wall house built in the 1930's with recent external insulation fitted.
I know some might advise on Demand Control Ventilation as a more cost efficient method but leaving aside cost, would the MVHR provide a noticeable improvement in air quality?

Calahonda52

Yes re the air quality: absolutely
you will need to consider a chilling coil on the intake so as you can regulate the RH of the incoming air so as it will be ready to "absorb" the higher humidity in the house

SemperFidelis

I put one into a 1970s nowhere near airtight bungalow and it has made a massive difference. We used to get mould under cot and beds and in a few places around the house. Much fresher now and no mould since.

Also even witout airtightness I get around 1.5 - 2 degree difference in temps of supply and extract, so I'm recovering loads of the heat from the extracted air.

MightyMunster

SemperFidelis wrote: »

I put one into a 1970s nowhere near airtight bungalow and it has made a massive difference. We used to get mould under cot and beds and in a few places around the house. Much fresher now and no mould since.

Also even witout airtightness I get around 1.5 - 2 degree difference in temps of supply and extract, so I'm recovering loads of the heat from the extracted air.

My parents had the same experience, removed mould in wardrobes etc. Were delighted with it.