A Landlord’s Guide to PIV Installation
Author
Ian Murray
Date Published
Protect Your Property, Protect Your Tenants
At ClearAir PIV, we work with landlords across the UK. They want a reliable way to reduce damp, improve air quality and protect their rental properties.
Awaab’s Law was introduced on 27 October 2025, bringing with it strict response times for damp and mould hazards. Landlords now face more pressure than ever to take moisture issues seriously. The days of wiping mould away and hoping for the best are long gone. Issues must be investigated within 10 working days under housing health and safety laws.
Indoor pollutants need to be addressed and a better living environment for tenants is required. All of which means a long-term solution is needed. That is why more landlords are turning to PIV in their rental property as a preventative measure.
Why Damp and Mould Are a Growing Concern for Landlords
Damp and mould issues increase during colder months. With excess cold, windows staying shut and heating running for longer. Rental properties are especially vulnerable to mould growth because:
- Tenants produce moisture through cooking, showers and everyday living.
- Windows are rarely opened in winter.
- Furniture is often placed tight against cold external walls.
- Small issues go unnoticed until mould becomes visible.
Once black mould appears, it spreads fast. It damages walls, skirting boards and paintwork. It also affects indoor air quality and tenant wellbeing.
And now, under Awaab’s Law, landlords must investigate reports of damp or mould within specific timeframes. Prevention is far easier and far more cost-effective than dealing with hazards after they develop.
Why a PIV Unit Is Ideal for Rental Properties
A Positive Input Ventilation PIV system is one of the simplest and most effective ways to tackle condensation.. It works by supplying a steady flow of filtered fresh air from the loft space into the home. The clean air from the ventilation unit dilutes moisture and pushes out damp, stale air.
For rental properties, the benefits are clear.
Prevents condensation and mould
A PIV system reduces humidity levels across the whole home. When moisture is controlled, mould cannot form.
Improves tenant health and comfort
Fresh, filtered air helps remove musty smells, allergens and airborne pollutants. Tenants notice the difference quickly.
Protects walls, windows and fixtures
Stopping condensation prevents long-term damage to plaster, window frames and decor. This reduces repair costs.
Low running costs
Modern PIV units use very little electricity, even with a built-in heater. Running costs are often less than £10 per year for non-heated models.
Works automatically
Tenants do not need to adjust anything. The system runs in the background, quietly and consistently.
Helps landlords meet Awaab’s Law expectations
A landlord who can demonstrate proactive ventilation measures is better protected from mould-related health and safety rating complaints.
How ClearAir Handles PIV Installation for Landlords
Our process is simple.
Free property assessment
We visit the rental property, take moisture readings and assess airflow to determine the right type of PIV unit.
Recommendation
For most rentals, a heated PIV unit is ideal for winter comfort and consistent performance.
Quick and tidy installation
Most installations take only a few hours. Our engineers work cleanly and leave the property exactly as they found it.
Immediate results
Many landlords notice reduced condensation within days. Tenants report fresher air and a drier home almost straight away.
Certification for your records
We provide full installation documentation, which is useful when demonstrating proactive measures under Awaab’s Law.
Hannah B-C
Nov 1, 2025
The service that we received from ClearAir PIV and Steven himself has been excellent. We have been looking into PIV systems for a while as we have had such a problem with condensation on our bedroom windows. As soon as the temperature begins to drop each year the windows are covered. It has ruined the decor around the windows and caused mould to grow on the frames. Having spoken to Steven on the phone I could tell had specialist knowledge in the area. There was no hard sell, just advice. I got him booked in the same week to fit an Nuaire PIV and I’m so glad we did. Fitting was done quickly and cleanly by John who was friendly, well presented and very knowledgeable and experience in ventilation systems. Steven came too to give advice on another issue we had discussed on the phone. Result: NO MORE CONDENSATION!!! I thought it might take a few days to clear the moisture, but the next morning we checked the windows when they would normally be soaked and… nothing! And nothing since! So happy! I’d read in some reviews of the PIV systems that they were noisy and made the landing cold. This is not my experience. I honestly can’t hear it and although the landing may be ever so slightly cooler, the overall temp of the house isn’t effected and it’s not anything I’m concerned about.
Jack Capstick
Oct 2, 2025
Just had a new PIV unit installed by ClearAIR and I can only say positive things. The whole team from Steven to his employees were amazing to work with, since the instalment all our mould has disappeared and I can’t thank the team enough.I highly recommend ClearAIR as they were worth every penny.
Sarah Cocking
Oct 2, 2025
Would highly appreciated Steven at clear air piv. From start to finish he was so helpful and kept us upto date with the installation. We've noticed a massive difference since. Thank you for a great service
Sarah Brent
Oct 2, 2025
Excellent Service and Results! I recently had a new PIV system installed in my home, and I couldn't be happier with the outcome. Communication with Steven was excellent from start to finish — he responded immediately to any queries and kept me informed throughout the entire process. The installation itself was smooth and professional. Since having the system installed, I’ve had no issues with mould or condensation — a huge improvement! I would highly recommend Steven and his company, CLEARAIR PIV Ltd. Reliable, efficient, and effective service.
Lois Green
Oct 2, 2025
Couldn’t recommend Steven enough. From start to finish the communication was amazing and everything was explained so clearly. He was professional, efficient, and made the whole process completely stress-free. The quality of work is outstanding, and it’s clear he really takes pride in what he does. I wouldn’t hesitate to recommend Steven at Clear Air PIV to anyone looking for a reliable and trustworthy service.
Why Landlords Should Act Now
Damp problems are most visible in autumn and winter, and they escalate quickly. By installing a PIV system before mould takes hold, landlords can avoid complaints from tenants.
The health concerns raised by the tenants and the need for compliance with Awaab’s Law can result in costly repairs or potential fines.
A PIV installation is an investment that protects both the property and the people living in it.
FAQs
Will a PIV unit stop mould completely?
Yes. Existing mould should be cleaned, but a PIV system prevents it from returning by controlling humidity.
Is a heated PIV unit better for rentals?
In most cases, yes. A heated unit ensures comfortable airflow during colder months and is ideal for bungalows, flats and older homes.
Does a PIV unit need maintenance?
Very little. A simple filter check every few years is usually enough.
Will tenants need to operate the system?
No. PIV units operate automatically. Tenants do not need to adjust anything.
How does this help with Awaab’s Law?
Awaab’s Law requires landlords to act quickly on damp and mould reports. A PIV system prevents these issues from developing in the first place, reducing risk and demonstrating proactive management.