What does Rensair do?
Rensair provides sustainable ventilation solutions that can reduce a building’s ventilation energy consumption and carbon footprint by more than 40%. Installations are simple and solutions have an immediate return on investment, requiring no capital spending.

How did London & Partners help you to set up and grow your sustainability business in London?
London & Partners introduced us to a diverse set of clients, including large real estate owners and operators, governmental officers, sustainability managers and facilities managers, all of which have a natural interest in saving energy and reducing carbon emissions.
In addition, London & Partners events have been very useful for networking with peers, investors and companies that support the scale up of ambitious startups.
What is Rensair’s long-term sustainability goal in the coming years?
Heating, ventilation and air conditioning (HVAC) systems are responsible for approximately 15% of global emissions.
We are helping London’s leading law firms, financial institutions and real estate companies rethink how they ventilate buildings, introducing new, efficient and sustainable practices, which significantly reduce carbon emissions in a permanent fashion.
What challenges did you face to become a successful sustainability business in London? How did you overcome them?
Some barriers were raised as our solutions disrupted current ventilation practices. However, we overcame these challenges by presenting successful trials undertaken with global companies.
These case studies provided hard data that demonstrated the effectiveness of our solutions and the significant energy reduction and excellent indoor air quality achieved with our installations.
Why do you think now is the best time to set up and grow a sustainability company in London?
We set up in the centre of London to serve the many public sector entities and significant businesses located in the capital. All these institutions have published ambitious ESG targets and have relatively short timelines to achieve those objectives.
The size, importance and number of these organisations means, for sustainability companies operating in London, the demand is great and the opportunities are interesting and attractive.