PIV Unit Installation in Bournemouth, Poole and Dorset
Say goodbye to condensation and mould.
PIV units are one of the simplest, most cost-effective ways to improve air quality at home. We survey, supply and install loft and wall-mounted systems across the region.
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How it works
Gentle positive pressure, healthier air
A PIV unit continuously introduces filtered fresh air at a low rate. This slight positive pressure pushes moist, stale air out through natural gaps in the building, diluting humidity before it can settle as condensation.
Unit types
The right PIV for your property
Loft-mounted PIV
The most common option for houses and bungalows. The unit sits in the loft and draws in tempered, filtered air, supplying it through a single ceiling diffuser on the landing.
Wall-mounted PIV
Ideal for flats and apartments without loft access. Mounted on an external wall, drawing fresh air directly from outside and distributing it into the home.
Heated PIV units
Units with a built-in heater temper incoming air on colder days, keeping comfort high while still controlling moisture.
Is PIV right for you?
Common signs your home needs better ventilation
We'll check your property, moisture sources and existing extract fans, and tell you honestly whether PIV, MVHR or simple extract upgrades are the best fit.
- Streaming windows in the morning
- Black mould around windows or ceilings
- Musty smells or stale air
- Damp patches on walls
- Allergies made worse indoors
- Landlords managing damp & mould compliance
Service area
Areas we cover
We survey and fit PIV units in homes and rental properties across Dorset, including Bournemouth, Poole, Weymouth, Christchurch and Ferndown. We also cover the villages in between and the wider BH and DT postcode areas. Check your postcode with us.
FAQs
Frequently asked questions about PIV units in Dorset
How much does a PIV unit cost to install?
A loft-mounted PIV unit is one of the most affordable whole-home ventilation upgrades. A wall-mounted unit for a flat is usually a similar price. Heated models and homes with difficult loft access cost a little more. We visit to check your loft, the moisture sources and the existing extract fans, then give you a fixed price with no hidden extras.
How long does PIV installation take?
Most loft-mounted PIV units are fitted in half a day to one day. That includes positioning the unit, fitting the ceiling diffuser on the landing, making the electrical connection and setting the fan speed. Wall-mounted units for flats are usually just as quick. There is very little mess, and you can use your home as normal during the work.
Will a PIV unit cure condensation and mould?
PIV is very effective at reducing condensation and the black mould it causes, because it continuously dilutes humid air. It will not fix leaks, rising damp or penetrating damp, so we look for these during the survey. In airtight new builds, whole-house MVHR may be a better long-term choice. We always recommend the most suitable option.
What does a PIV unit cost to run?
A typical PIV fan uses very little electricity and often costs just pennies a day to run continuously. Heated models use more power on cold days, when the heater warms the incoming air, but they only switch it on below a set temperature. Because PIV lowers humidity, your home can also feel warmer and be easier to heat.
Do I need permission to fit PIV in a rented or leasehold flat?
Planning permission is not normally needed for a loft PIV unit. A wall-mounted unit in a flat may need the freeholder's or managing agent's consent because it goes through an outside wall. Landlords in Bournemouth and Poole often fit PIV to help meet damp and mould responsibilities. We can provide documents for your records.
How often does a PIV unit need servicing?
We recommend changing the inlet filter and checking the fan about once a year, or sooner in dusty lofts. A blocked filter reduces airflow, which makes the unit less effective against condensation. We can add your PIV unit to an annual servicing and maintenance plan so it keeps working quietly, year after year.
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