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Rensair

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A specialist in air purification, protecting and enhancing lives through clean air

London, United KingdomFounded 2020Health
Valuation <$5M Last recorded · 2025
Headcount <100 Current team size
Total funding $0–10M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Rensair and the history behind them.

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 data

At 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

Funding history

2 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
EARLY VC✓Equity / VC Dec 2025 $28K $111K Startup Wise Guys —
SERIES A✓Equity / VC May 2022 $7M $28M Hoxton Ventures ↗
Showing the latest 2 of 2 recorded eventsBook a demo for the full funding history →

Growth signals

Rensair website traffic

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.

Latest monthly visits16K 3-month web change+97.5% 1-year team growth+16%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

Company identity and context are open; selected comparison metrics preview what is available on the platform.

Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

5 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Series A2 investors entered at this stage

Other known investors3 additional known investors

Team profiled 9 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 5 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
5 countries with
team presence
🇬🇧 United Kingdom41.7%
🇺🇸 United States33.3%
🇩🇰 Denmark12.5%
🇹🇷 Turkey8.3%
🇦🇹 Austria4.2%
5 countries shown

Market sentiment

Posts on X, past 7 days

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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