A Landlord’s Guide to PIV Installation

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.

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.