R
Rensair
A specialist in air purification, protecting and enhancing lives through clean air
About Rensair
Rensair, held by Respired Limited, is a company specializing in advanced air purification and energy-efficient ventilation solutions. Their primary product, the Smart Demand Controlled Ventilation (SDCV) system, is designed to significantly reduce energy consumption and carbon emissions in buildings by optimizing mechanical ventilation based on occupancy levels. This technology can cut energy use by at least 40%, making it an attractive option for businesses looking to decarbonize their operations.
Rensair serves a diverse range of clients, including educational institutions, healthcare facilities, and various types of real estate buildings such as offices, universities, and laboratories. Their air purification devices, originally developed for infection prevention in hospitals, are now used in classrooms to improve air quality and reduce noise levels. These devices are highly effective, achieving a 99.9% reduction in airborne particles in just over 34 seconds, as validated by the UK National Health Service.
The company operates in the indoor air quality and energy efficiency market, leveraging its healthcare expertise to provide solutions that meet stringent standards. Rensair's business model involves designing, developing, and installing air purification and ventilation systems tailored to the specific needs of their clients. They generate revenue through the sale and installation of these systems, as well as ongoing maintenance and support services.
In healthcare settings, Rensair's solutions allow for shorter waiting times between patient appointments and higher patient capacity, which is particularly beneficial in dental suites and senior living centers. Their systems have been proven to reduce the transmission of airborne diseases, enhancing the overall health and safety of these environments.
Overall, Rensair is positioned as a leader in the field of clean indoor air and energy-efficient building solutions, combining innovative technology with a strong focus on sustainability and health.
Source: Dealroom company dataAt a glance
- Status
- Operational
- Founded
- 2020
- Headquarters
- London, United Kingdom
- Employees
- 29
- Open positions
- None listed
- Dealroom signal
- 81.6/100
- Industry
- Health, Home Living
- Sector
- Health, Pollution, Sustainable Development Goals, Air Quality Monitoring and Treatment, Climate Tech
- Business model
- Manufacturing
- Client focus
- b2b
Knowledge graph
More headlines
Funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| EARLY VC✓Equity / VC | Dec 2025 | $28K | $111K | Startup Wise Guys | — |
| SERIES A✓Equity / VC | May 2022 | $7M | $28M | Hoxton Ventures | ↗ |
Growth signals
Latest recorded traffic for Rensair is 16K monthly website visits, up 97.5% over the last three months. Rensair's team grew 16% over the past year.
Similar companies
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Investments and acquisitions
Recent portfolio relationships for companies that also act as investors or acquirers.
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Series A2 investors entered at this stage
Hoxton Ventures
Startup Wise Guys
Other known investors3 additional known investors
Alumni Ventures
Grow London
HCN Ventures
Source: Dealroom Talent Intelligence.
Global footprint
team presence
Market sentiment
An AI-synthesised read of the highest-engagement posts about Rensair on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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