Rensair “Smart Demand Controlled Ventilation” (SDCV) provides an excellent Indoor Air Quality environment whilst significantly reducing energy consumption and carbon emissions by more than 40% in buildings. SDCV takes HVAC efficiency to another level by both: part substituting expensive mechanical ventilation with cost-effective air purification and also by optimising the mechanical ventilation/air purification mix in real time to suit occupancy levels. Rensair is implementing SDCV with large multinationals, public institutions and leading universities, helping them take large steps forward in reducing energy consumption towards their Net Zero targets. We take into account floor plans, existing HVAC systems, occupancy rates and noise tolerance, before recommending a tailor-made IoT solution. Rensair is a specialist in air purification, protecting and enhancing lives through clean air. Our patented technology, which combines H13 HEPA filtration with germicidal UVC light, was developed to meet the strict standards of Scandinavian hospitals and is independently validated by scientific research laboratories, including Eurofins, Norconsult, Oslo University Hospital, and the Danish Technological Institute. Rensair air purification technology destroys a minimum of 99.97% of airborne viruses, including coronavirus, and meets all the standards recommended by the UK SAGE committee and US EPA.