The simple fact is they work - I have fitted several in rented houses with severe condensation despite double glazing central heating etc - I tried everything ,de-humidifiers,air bricks,polystyrene warm lining to exterior walls non of which made the slightest difference - fitted a PIV and within days the problem was solved 100 % on all of them - You can do as many calculations as you like but the proof is in the testing - They now make a PIV with a small heaters and these also work - People with PIVs installed have checked humidity and its gone down massively. Opening the windows in cold weather massively drops the internal temperature and makes the house colder than a PIV so thats not a solution.The de-humidifier filled up completely and needed emptying every morning but made no difference at all to the condensation problem.

@jenniferdoyle3969

9 ай бұрын

I've had one installed 10 days ago. It's drawing an insulation, attic, dusty smell into the house. Is there anything I can do? There is no felt on the roof.

@bernie129locksmith

9 ай бұрын

@@jenniferdoyle3969 Never had this problem and I have fitted loads - best thing to do would be to order spare filters and keep rotating and washing them until it settles down - they are easy to change only takes 5 minutes

@tomhoughton8535

8 ай бұрын

You need to get out there and test your theory

@bernie129locksmith

8 ай бұрын

I already have - I have fitted them in many rentals and for customers and recommended them to other people - Every one without fail has been a success where de-humidifiers etc will always fail . There no better way of testing a theory than by putting your money up and trying it - I think in total I have fitted and recommended over 20 with 100% success rate and these were in properties where the tenants and home owners were using a £350 de- Humidifier ,emtying a full bucket every morning with little or no improvement ! @@tomhoughton8535

Spot on, this is also my practical experience of experimenting with my static caravan's shocking humidity issues. Bear in mind there's no heating at night, but the moisture from bodies causes havock overnight, and yes even had the wet duvet experience, not nice 😂. Having tried dehumidifiers (they work of course, but at the cost of elec and noise) vs simply opening the windows a little, guess what, opening the windows is the most efficient, the electric blanket at only 20w is a must though! Solved, no more condensation, far less moisture (dew point measured via hydromometer and temperature) and the most important factor, no mould spore growth. Next to test is extraction at source (quiet fan extracting through vent over night) although from a heat perspective no difference than leaving a window a jar. Apparently opening windows twice a day is some what of a German custom I hear.

@Stan_55UK

2 ай бұрын

We have lived on a boat for 7 years now, and agree 100% re venting. My daughter lives in Germany, and yes, opening the windows for an hour is almost a law! They have a lot of concrete buildings and I guess that venting these is essential.

The main benefit of positive ventilation that I've understood is that instead of allowing air leakage into the building, a little bit of positive pressure keeps it from coming in (by blowing out conditioned air). If the air you're bringing in is too humid, then you would dehumidify it. I'm going to do a balanced approach, but maybe try to pressurize just a tad.

would you recommend balanced pressure ventilation for air tight houses?

Would a house with underfloor insulation still benefit from ground vapor barrier?

It works if the user Gets a hygrometer and knows when to turn off and when to keep it on. Not a good idea to leave it on Auto 24/7.