Is Your PIV Unit Making Your House Cold? We Just Fixed This Common Poole Setup Error

Our team recently completed a rectification job in the Ashley Cross area of Poole following reports of a cold house. The homeowner had previously contracted another firm to install a Positive Input Ventilation (PIV) system to combat damp and condensation. Upon arrival, the customer stated that while the mould issues had improved, the property had become significantly colder, particularly in the hallway and landing areas. This is a common complaint when PIV unit making house cold is not addressed during the initial installation phase.

Our inspection of the loft space revealed that an unheated Nuaire Drimaster model had been fitted in an exposed section of the roof near the eaves. The diffuser was positioned directly over the main stairwell, causing untempered air to drop vertically into the living space. We identified that the lack of an inline heater and incorrect fan speed commissioning were the primary factors. When discussing positive input ventilation pros and cons, the potential for draughts is frequently cited, though this is almost always a result of poor placement or failing to account for winter temperature drops.

We relocated the unit to a more central position within the loft and installed a pre-heater to ensure incoming air is tempered before entering the building envelope. Our City & Guilds qualified electricians reconfigured the ducting with thermal insulation to prevent heat loss between the unit and the diffuser. We then re-commissioned the system, adjusting the flow rates to match the specific cubic volume of the property to ensure effective air changes without creating a wind-chill effect.

This modification has successfully stabilised the internal temperature while continuing to manage humidity levels effectively. As a lead electrician Poole Dorset, we frequently resolve similar installation errors in residential properties near Poole Quay and surrounding areas. Our team maintains a 98% satisfaction rate by ensuring all ventilation systems are fully compliant with current building regulations and property-specific requirements.

Proper setup and commissioning are vital to ensure PIV units provide the intended benefits without compromising thermal comfort. We provide complete electrical and ventilation services across Dorset, Hampshire, and Wiltshire. Photos of the finalised insulated ducting setup to follow.