Pursuant to yet another tenant complaint about mould on the windows I realise that I'm never going to get these nuisances to dry their clothes in a tumble drier, squeegee the shower walls, turn on the extractor fan and use a cooker hood religiously. Or stop breathing at night..

So i'm thinking to just install a small MVHR in the loft of what is otherwise a reasonably airtight (no many drafts) and acceptably insulated flat. Much as I'd love to kick the tenant out for 6 months while I renovate the entire thing, re-insulate, draftproof etc I haven't the time, money or health at the mo (other build has put paid to all those)

I'm hence looking for a relatively inexpensive part way solution to the "oh, the walls are growing black mould" complaint that isn't going to take forever to implement and isn't anything the tenant can switch off or obviate.. Any recommendations?

If you consider there is a way to make the tenants pay up when you get awarded legal cost (e.g. they are in employment, so can do attachment of earning order), then I think I would solve the problem with a S21…

PIV units do work, but given how bad your current tenants are how will you stop them turning one off?

Posted By: cjardChanging filters once in a while is the biggest bugbear

Ours need cleaning (washing rather than replacing) every few months, not sure exactly how often since it seems to vary a bit. The unit puts a red light on when it needs doing. It's simple enough to do and I do it since I own it, but I can imagine it being problematic with some tenants.

Don't forget that the ducts and the MVHR unit will need insulating if they are in an unheated loft.