Excess moisture, condensation and black mould are common issues in UK homes. If you have persistent condensation on windows, humid air, or visible damp and mould patches, positive input ventilation (PIV) offers an effective solution. PIV unit installation by Damp Resolutions is designed to permanently reduce condensation and mould, improving indoor air quality with clean, filtered air while protecting your home and your health.
Positive input ventilation systems are specifically engineered to solve condensation and damp problems in domestic properties. A PIV unit works by gently drawing in fresh air from outside (or your loft space, for loft-mounted units), filtering it, and distributing it into your home at a continuous rate. This steady supply of fresh filtered air pushes out moisture-laden air, stale air, and airborne pollutants, so condensation and mould cannot take hold.
Over a million UK homes already benefit from positive input ventilation systems. The constant airflow generated by a PIV unit means excess moisture no longer settles on cold surfaces, eliminating the root causes of condensation and black mould. Our PIV installation process is non-disruptive and relatively quick, with most units up and running in a few hours.
At Damp Resolutions, we provide expert PIV unit installation tailored to your property type. If you are comparing ventilation options to reduce condensation, PIV systems offer several advantages. A filtered air supply significantly improves indoor air quality, which is helpful for people with allergies and asthma. Heated PIV units are available to stop cold air from cooling your home during winter. Annual running costs are low, typically only a few pounds a year. Installation costs are usually lower than those of many other ventilation and air quality solutions. PIV systems help protect against costly repairs caused by mould growth or structural damage from excess humidity.
There are different types of PIV units to suit all properties, including loft-mounted PIV units for houses with attic space, and wall-mounted units (for example, Flatmaster) to provide ventilation in flats or homes without a loft. The choice depends on your property’s size, layout and your preferences. There are also dedicated PIV extractor fan options for specific layouts and requirements.
Damp Resolutions is an established PIV installer operating across the UK. Our qualified technicians survey your property and recommend a positive input ventilation unit precisely suited to your needs. We supply and fit leading brands tested for UK conditions, working quickly and professionally:
We start with a damp survey to confirm the cause of condensation and check your loft ventilation is suitable (for loft-mounted piv units). Our piv installers recommend the ideal unit and provide full details of the installation cost upfront.
On fitting day, we install a dedicated ceiling or wall vent, connect insulated ducting, position the piv unit (usually in the loft or against an external wall), and wire it to meet UK building regulations.
Filters and heater settings (if specified) are checked and tuned for your environment. You get a demonstration of how the system works, with ongoing support and aftercare if required.
PIV installation costs vary depending on the type of unit, electrical work, and property type. For a deeper breakdown of typical figures and the factors that shape them, see our PIV system cost guide. Wall-mounted and heated piv units, larger properties, or complex configurations may increase this. Our quotes always cover the total installation cost, unit and any required surveys (no hidden extras).
In addition to the up-front cost, running costs are extremely low (usually a few pounds per year), and filters need replacing only every 3-5 years.
PIV systems do more than just reduce condensation. By supplying a consistent flow of fresh air, positive input ventilation piv units help remove indoor pollutants, allergens, odours and moisture. This reduces the risk of respiratory problems associated with damp and mould. The air is healthier for everyone, especially children, older people or those with conditions like asthma or allergies. You also reduce the risk of black mould growth and avoid many costly repairs. With more than a million installations nationwide, PIV systems are trusted by landlords, housing associations and private homeowners alike!
The main reason to install a PIV unit is to solve a condensation problem. PIV systems are extremely effective at preventing condensation and lowering humidity, especially in properties prone to black mould and excess moisture. They complement, but do not replace, extractor fans in kitchens or bathrooms, which remove very high levels of moisture at once. Positive input ventilation is a cost-effective solution that keeps your property dry and comfortable while protecting building materials and belongings from moisture damage.
PIV units are energy efficient and cheap to run. Even heated units use very little electricity. By minimising excess moisture, you reduce the risk of building damage, keeping maintenance costs and bills down. A PIV system’s running cost is often outweighed by savings from avoided damp and mould repairs.
Our team at Damp Resolutions can install a PIV unit in nearly any building. If you have loft space, a loft-mounted piv unit offers the most discreet and efficient solution. For flats, apartments, or properties without a loft, a wall-mounted unit or Flatmaster will provide filtered air from an external wall. You benefit from expert piv installers who recommend what will work best for your layout.
We provide a full warranty and aftercare support on every positive input ventilation system installation. We show you how to maintain your system for optimal performance, including filter changes and heater checks where relevant.
If you notice any issues with your PIV unit, our team can diagnose and resolve them quickly, ensuring your investment continues to deliver healthy, filtered air and a dry, mould-free property.
These are installed in the loft space, drawing fresh filtered air from outdoors through roof vents and delivering it to a central location, typically the ceiling of a landing or hallway. They are ideal for detached and semi-detached homes. Heated versions are available for improved comfort in cold weather, helping prevent temperature drops and keeping houses warm.
Wall-Mounted (Flatmaster) Units These are fitted directly to an external wall, so they are perfect for flats, basements or houses without loft space. They still deliver positive input ventilation and air-quality benefits with a filtered air intake, and you can choose between heated and standard versions.
Heated PIV units pre-warm incoming air to prevent cold air from entering living spaces and to ensure comfort. Standard unheated units offer maximum energy efficiency. All piv units include a filtration system to remove dust and pollen, and they are easy to maintain.
What Our PIV Installers Consider When we assess your property, we consider the size of your home, whether there are natural air leakage points, the preferred location for the unit in the loft or on outer walls, the electrical supply and any installation requirements, and the history of damp problems or mould growth.
Ready to solve a condensation problem for good? Contact Damp Resolutions today for a damp survey and a no-obligation quote. Our experienced PIV installers will help you choose the right PIV system and arrange quick, non-disruptive installation to suit your schedule. Invest in better air quality, protect your home, and enjoy lasting peace of mind. WhatsApp support is available on 07885 545737 for questions, quotations, and installation guidance.
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