rénovent

Rénovent is a term used in architecture and building engineering to describe an integrated approach to renovating existing buildings that centers on ventilation, indoor air quality, and energy efficiency. The name blends the French renover (to renovate) with vent from ventilation, signaling a focus on replacing or upgrading air-handling systems during retrofit projects.

Definition and scope: Rénovent encompasses assessment of a building's airtightness, thermal envelope, and air quality, followed by the installation of mechanical ventilation with heat recovery (MVHR) or energy recovery ventilation units, balanced ventilation, and demand-controlled systems. It often includes improved insulation, air sealing, and moisture management, along with smart controls and sensors for CO2, humidity, VOCs, and temperature.

Applications: It is used in the restoration of historic or energy-inefficient buildings, multi-family housing, schools, and commercial facilities where retrofitting would reduce energy demand while maintaining or improving occupant comfort. Designs emphasize compatibility with existing structures and minimization of disruption.

Impact and outcomes: Proponents emphasize reduced energy consumption, lower greenhouse gas emissions, better thermal comfort, fewer mold and condensation problems, and improved occupant health. Costs are typically higher upfront, but long-term savings and potential subsidies or incentives can offset them.

Considerations: Successful implementation requires professional planning, performance-based design, and ongoing maintenance of ventilation equipment. Inappropriate ventilation strategies can lead to excess humidity, indoor air quality issues, or unnecessary energy use. As a concept, rénovent is part of broader retrofit standards and energy-efficiency programs.