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Why ventilate the loft?
Your loft plays an important part in how your home handles heat and moisture. A loft that is poorly ventilated can trap warm, humid air, which leads to condensation on the underside of the roof, damp timbers and stored belongings, and heat build-up in summer. Most lofts rely on passive ventilation through vents at the eaves and ridge, but a loft ventilation fan can help where that is not enough.
What a loft fan does
A loft fan moves air through the roof space to remove heat and moisture. Fans can be controlled by a thermostat, a humidistat or a timer, so they only run when needed. A related option is a positive input ventilation (PIV) unit, which is mounted in the loft and gently pushes filtered air into the house to help with condensation in the living spaces. The right choice depends on your roof, your insulation and the problem you are trying to solve, and a ventilation specialist or electrician can advise.
Professional wiring and installation
The qualified electricians you compare through Kilowatts UK wire fans, thermostats and humidity controls safely and position them correctly. A loft fan is usually supplied from a fused connection unit with a means of isolation, so it can be switched off safely for maintenance. The electrician will check your insulation, roof type and the existing loft wiring, avoid burying cables in insulation where it would cause them to overheat, and make sure there is safe access to the fan. Gaps around ceiling hatches and fittings should be sealed so the fan does not draw warm, moist air up from the rooms below.
In England, adding a fan to an existing circuit is not usually notifiable under Part P, and you should receive a Minor Electrical Installation Works Certificate (MEIWC); a new circuit is notifiable and comes with an Electrical Installation Certificate (EIC). Ventilation in homes is covered by Approved Document F.
Combining ventilation upgrades
For better airflow throughout the house, many homeowners also fit ventilation fans or bathroom extractor fans to remove moisture at source. If you want to offset running costs, the solar panel comparison tool for homeowners shows how solar could power fans and other household appliances. Submit your project details, compare quotes from local electricians, or call Kilowatts UK free on 0800 009 6058.