Rensair valuation, funding and investors
Rensair works in air quality ecosystem development, based in London, United Kingdom. Founded in 2020, it has about 30 employees.
- Last round
- Series A · $7.00M · May 2022
- Valuation at last round
- $35.7M · implied
- Headcount
- 30 · growing
- Grade
- D
- Founded
- 2020
Rensair valuation today
VCMC values Rensair at $51.3M today, with a range of $12.7M to $101M and a grade of D. The valuation starts from its last funding round, a Series A round in May 2022.
Valuation by date (84 rows)
Each point is what the model would have shown on that date, using only what was known then; before its first round, a company is valued as a startup because it later raised.
| Date | Valuation | Range | Predicted in 1 yr | Phase | Headcount | Trend | Grade | Winding-down probability |
|---|---|---|---|---|---|---|---|---|
| 1 Jan 2020 | $10.2M | $3.72M – $28.1M | $11.4M (+11%) | before first round | – | unknown | D | 0% |
| 1 Feb 2020 | $10.3M | $3.75M – $28.3M | $11.5M (+11%) | before first round | – | unknown | D | 0% |
| 1 Mar 2020 | $10.4M | $3.78M – $28.6M | $11.6M (+11%) | before first round | – | unknown | D | 0% |
| 1 Apr 2020 | $10.5M | $3.82M – $28.8M | $11.7M (+11%) | before first round | – | unknown | D | 0% |
| 1 May 2020 | $10.6M | $3.85M – $29.1M | $11.8M (+11%) | before first round | – | unknown | D | 0% |
| 1 Jun 2020 | $10.7M | $3.89M – $29.3M | $11.9M (+11%) | before first round | – | unknown | D | 0% |
| 1 Jul 2020 | $10.8M | $3.92M – $29.6M | $12.0M (+11%) | before first round | – | unknown | D | 0% |
| 1 Aug 2020 | $10.9M | $3.96M – $29.9M | $12.1M (+11%) | before first round | – | unknown | D | 0% |
| 1 Sep 2020 | $11.0M | $3.99M – $30.1M | $12.2M (+11%) | before first round | – | unknown | D | 0% |
| 1 Oct 2020 | $11.1M | $4.03M – $30.4M | $12.3M (+11%) | before first round | – | unknown | D | 0% |
| 1 Nov 2020 | $11.2M | $4.07M – $30.7M | $12.4M (+11%) | before first round | – | unknown | D | 0% |
| 1 Dec 2020 | $11.3M | $4.10M – $31.0M | $12.6M (+11%) | before first round | – | unknown | D | 0% |
| 1 Jan 2021 | $11.4M | $4.14M – $31.2M | $12.7M (+11%) | before first round | – | unknown | D | 0% |
| 1 Feb 2021 | $11.5M | $4.18M – $31.5M | $12.8M (+11%) | before first round | – | unknown | D | 0% |
| 1 Mar 2021 | $11.6M | $4.21M – $31.8M | $12.8M (+11%) | before first round | – | unknown | D | 0% |
| 1 Apr 2021 | $11.7M | $4.25M – $32.1M | $12.9M (+11%) | before first round | – | unknown | D | 0% |
| 1 May 2021 | $11.8M | $4.29M – $32.4M | $13.0M (+11%) | before first round | – | unknown | D | 0% |
| 1 Jun 2021 | $11.9M | $4.33M – $32.7M | $13.1M (+10%) | before first round | – | unknown | D | 0% |
| 1 Jul 2021 | $12.0M | $4.37M – $33.0M | $13.2M (+10%) | before first round | – | unknown | D | 0% |
| 1 Aug 2021 | $12.1M | $4.41M – $33.3M | $13.3M (+10%) | before first round | – | unknown | D | 0% |
| 1 Sep 2021 | $12.2M | $4.45M – $33.6M | $13.4M (+10%) | before first round | – | unknown | D | 0% |
| 1 Oct 2021 | $12.3M | $4.49M – $33.9M | $13.5M (+10%) | before first round | – | unknown | D | 0% |
| 1 Nov 2021 | $12.4M | $4.53M – $34.2M | $13.6M (+10%) | before first round | – | unknown | D | 0% |
| 1 Dec 2021 | $12.5M | $4.57M – $34.5M | $13.7M (+9%) | before first round | – | unknown | D | 0% |
| 1 Jan 2022 | $12.7M | $4.61M – $34.8M | $13.8M (+9%) | before first round | – | unknown | D | 0% |
| 1 Feb 2022 | $12.8M | $4.65M – $35.1M | $13.9M (+9%) | before first round | – | unknown | D | 0% |
| 1 Mar 2022 | $13.8M | $5.03M – $37.9M | $15.1M (+9%) | before first round | 25 | unknown | D | 0% |
| 1 Apr 2022 | $13.9M | $5.06M – $38.2M | $15.2M (+9%) | before first round | 25 | unknown | D | 0% |
| 1 May 2022 | $14.0M | $5.10M – $38.5M | $15.3M (+9%) | before first round | 25 | unknown | D | 0% |
| 10 May 2022 | $35.7M | $23.4M – $97.7M | $64.2M (+80%) | after a round | 25 | unknown | C | 0% |
| 1 Jun 2022 | $37.0M | $23.4M – $97.7M | $64.2M (+73%) | after a round | 25 | unknown | C | 0% |
| 1 Jul 2022 | $38.9M | $23.4M – $97.7M | $64.2M (+65%) | after a round | 25 | unknown | C | 0% |
| 1 Aug 2022 | $40.8M | $23.4M – $97.7M | $64.2M (+57%) | after a round | 25 | unknown | C | 0% |
| 1 Sep 2022 | $42.9M | $23.4M – $97.7M | $64.2M (+50%) | after a round | 25 | unknown | C | 0% |
| 1 Oct 2022 | $45.1M | $23.4M – $97.7M | $64.2M (+43%) | after a round | 25 | unknown | C | 0% |
| 1 Nov 2022 | $47.4M | $23.4M – $97.7M | $64.2M (+36%) | after a round | 25 | unknown | C | 0% |
| 1 Dec 2022 | $49.7M | $23.4M – $97.7M | $64.2M (+29%) | after a round | 25 | unknown | C | 0% |
| 1 Jan 2023 | $52.2M | $23.4M – $97.7M | $64.2M (+23%) | after a round | 25 | flat | C | 0% |
| 1 Feb 2023 | $54.9M | $23.4M – $97.7M | $64.2M (+17%) | after a round | 25 | flat | C | 0% |
| 1 Mar 2023 | $57.4M | $23.4M – $97.7M | $64.2M (+12%) | after a round | 25 | flat | C | 0% |
| 1 Apr 2023 | $60.4M | $23.4M – $97.7M | $64.2M (+6%) | after a round | 25 | flat | C | 0% |
| 1 May 2023 | $63.4M | $23.4M – $97.7M | $64.2M (+1%) | after a round | 25 | flat | C | 0% |
| 1 Jun 2023 | $64.2M | $22.6M – $97.7M | $64.2M (0%) | after a round | 25 | flat | C | 0% |
| 1 Jul 2023 | $64.2M | $21.5M – $97.7M | $64.2M (0%) | after a round | 25 | flat | C | 0% |
| 1 Aug 2023 | $64.2M | $20.4M – $97.7M | $64.2M (0%) | after a round | 25 | flat | C | 0% |
| 1 Sep 2023 | $64.2M | $19.4M – $97.7M | $64.2M (0%) | after a round | 25 | flat | C | 0% |
| 1 Oct 2023 | $28.4M | $17.0M – $52.0M | $17.2M (-40%) | after a round | 17 | shrinking | B | 97% |
| 1 Nov 2023 | $27.4M | $16.1M – $52.2M | $16.5M (-40%) | after a round | 17 | shrinking | B | 97% |
| 1 Dec 2023 | $26.5M | $15.4M – $52.5M | $15.9M (-40%) | after a round | 17 | shrinking | C | 97% |
| 1 Jan 2024 | $25.6M | $14.6M – $52.8M | $15.2M (-41%) | after a round | 17 | shrinking | C | 97% |
| 1 Feb 2024 | $24.8M | $13.9M – $53.0M | $14.6M (-41%) | after a round | 17 | shrinking | C | 97% |
| 1 Mar 2024 | $24.0M | $13.2M – $53.3M | $14.1M (-41%) | after a round | 17 | shrinking | C | 97% |
| 1 Apr 2024 | $23.2M | $12.6M – $53.5M | $13.5M (-42%) | after a round | 17 | shrinking | C | 97% |
| 1 May 2024 | $22.4M | $12.0M – $53.8M | $13.0M (-42%) | after a round | 17 | shrinking | C | 97% |
| 1 Jun 2024 | $20.1M | $11.4M – $42.6M | $11.7M (-42%) | after a round | 17 | shrinking | C | 97% |
| 1 Jul 2024 | $24.0M | $11.3M – $72.3M | $15.4M (-36%) | after a round | 21 | down | C | 97% |
| 1 Aug 2024 | $25.2M | $11.1M – $75.4M | $16.6M (-34%) | after a round | 21 | up | C | 89% |
| 1 Sep 2024 | $26.4M | $10.8M – $78.2M | $17.8M (-33%) | after a round | 21 | up | C | 82% |
| 1 Oct 2024 | $27.7M | $10.6M – $80.8M | $19.1M (-31%) | after a round | 21 | up | D | 76% |
| 1 Nov 2024 | $28.9M | $10.3M – $83.1M | $20.4M (-29%) | after a round | 21 | up | D | 70% |
| 1 Dec 2024 | $30.2M | $10.1M – $85.1M | $21.8M (-28%) | after a round | 21 | up | D | 64% |
| 1 Jan 2025 | $31.1M | $9.75M – $86.1M | $22.8M (-27%) | after a round | 20 | up | D | 59% |
| 1 Feb 2025 | $32.3M | $9.53M – $87.7M | $24.1M (-25%) | after a round | 20 | up | D | 54% |
| 1 Mar 2025 | $33.6M | $9.35M – $89.1M | $25.5M (-24%) | after a round | 20 | up | D | 50% |
| 1 Apr 2025 | $34.8M | $9.14M – $90.4M | $26.8M (-23%) | after a round | 20 | up | D | 46% |
| 1 May 2025 | $36.0M | $8.95M – $91.4M | $27.7M (-23%) | after a round | 20 | up | D | 42% |
| 1 Jun 2025 | $35.5M | $7.75M – $82.6M | $29.2M (-18%) | after a round | 20 | up | D | 39% |
| 1 Jul 2025 | $36.5M | $7.48M – $82.9M | $30.4M (-17%) | after a round | 20 | up | D | 36% |
| 1 Aug 2025 | $37.8M | $7.29M – $84.0M | $31.7M (-16%) | after a round | 21 | up | D | 33% |
| 1 Sep 2025 | $38.7M | $7.03M – $84.2M | $32.8M (-15%) | after a round | 21 | up | D | 30% |
| 1 Oct 2025 | $39.0M | $5.35M – $83.3M | $32.3M (-17%) | after a round | 21 | flat | D | 28% |
| 1 Nov 2025 | $39.7M | $5.09M – $83.1M | $33.1M (-17%) | after a round | 21 | flat | D | 26% |
| 1 Dec 2025 | $42.8M | $6.54M – $87.8M | $37.1M (-13%) | after a round | 25 | up | D | 24% |
| 1 Jan 2026 | $43.5M | $6.30M – $87.9M | $38.1M (-13%) | after a round | 25 | up | D | 22% |
| 1 Feb 2026 | $44.4M | $6.06M – $88.2M | $39.3M (-12%) | after a round | 25 | up | D | 20% |
| 1 Mar 2026 | $45.3M | $5.86M – $88.6M | $40.5M (-11%) | after a round | 25 | up | D | 18% |
| 1 Apr 2026 | $45.1M | $4.05M – $86.8M | $40.6M (-10%) | after a round | 23 | flat | D | 17% |
| 1 May 2026 | $45.8M | $3.85M – $86.9M | $41.7M (-9%) | after a round | 23 | flat | D | 16% |
| 1 Jun 2026 | $46.9M | $5.23M – $88.6M | $43.2M (-8%) | after a round | 23 | up | D | 14% |
| 1 Jul 2026 | $47.5M | $5.04M – $88.6M | $44.1M (-7%) | after a round | 23 | up | D | 13% |
| 1 Aug 2026 | $63.1M | $16.8M – $98.7M | $61.9M (-2%) | after a round | 29 | growing | C | 2% |
| 1 Sep 2026 | $64.4M | $16.5M – $100M | $64.1M (0%) | after a round | 29 | growing | C | 2% |
| 1 Oct 2026 | $65.0M | $16.3M – $101M | $64.8M (0%) | after a round | 30 | growing | C | 1% |
| 24 Oct 2026 | $51.3M | $12.7M – $101M | $51.2M (0%) | after a round | 30 | growing | D | 1% |
Key facts about Rensair
- Founded
- 2020
- Headquarters
- London, United Kingdom
- Employees
- about 30 +43% in a year
- Total raised
- $7.0M
- Funding rounds
- 1
- Last round
- Series A May 2022
Rensair was founded in 2020 by Christian Hendriksen and Frederik Hendriksen.
Rensair funding history
Rensair has 1 funding round on record, from May 2022 to May 2022, $7.0M in total. None disclosed a valuation.
Series A 9 May 2022
Led by Hoxton Ventures; with 500 Global, AppWorks, Browder Capital, lightbank, Octopus Ventures, high net worth strategic investors.
Sources: rensair.com, rensair.com, rensair.com and 2 more
$7.0M
Rensair investors
7 investors have backed Rensair; Hoxton Ventures led at least one round.
- Hoxton Ventures lead
- 500 Global
- Browder Capital
- high net worth strategic investors
What Rensair does
Rensair works in industrial air solutions, with 14 recorded offerings and customers in healthcare, transportation, education and office.
Rensair Limited is a British private company that develops and supplies energy-efficient air purification solutions for HVAC systems. The company provides air filtration, smart building solutions, and IoT-based monitoring and management platforms for indoor air quality and energy efficiency. Rensair serves sectors such as offices, universities, hospitals, transport, and healthcare, and its solutions are certified by independent scientific laboratories. The company also offers decarbonization services for HVAC systems and supports clients in achieving environmental, social, and governance (ESG) and net zero targets.
Description from Veridion's company data.
Products and services
- Air Quality Ecosystem Development
- HVAC System Commissioning Services
- Air Filtration Solutions Implementation
- Smart Building Solutions Integration
- HEPA and UVC Air Purification Solutions
- IoT-Based Air Quality Monitoring Services
- Energy Efficiency Consulting Services
- Industry-Specific Ventilation Solutions
- Sustainable Building Technology Development
- Environmental Sustainability Consulting Services
- Customized Air Quality Solutions Development
- Smart Demand-Controlled Ventilation Solutions
- Global Air Quality Product Distribution
- HVAC System Decarbonization Consulting
Markets
- Healthcare
- Transportation
- Education
- Office
Technology
- HEPA Filters
- UVC Light
- IoT for Real-Time Air Quality Monitoring
- Smart Demand-Controlled Ventilation
Business model
- Business-to-Business
- Service Provider
- Manufacturing
Industry codes (NAICS)
- 333413 Industrial and Commercial Fan and Blower and Air Purification Equipment Manufacturing 50% match
- 238220 Plumbing, Heating, and Air-Conditioning Contractors 25% match
- 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services 25% match
Questions about Rensair
What is Rensair worth?
Valuation $51.3M (range $12.7M to $101M), as of 24 Oct 2026.
Has Rensair raised money?
Rensair has 1 funding round on record, from May 2022 to May 2022, $7.0M in total. None disclosed a valuation.
Who has invested in Rensair?
Hoxton Ventures, 500 Global, AppWorks, Browder Capital, high net worth strategic investors and lightbank, and 1 more. Lead investors include Hoxton Ventures.
How many people work at Rensair?
About 30, up 43% over the last year. Headcount grew from 25 in Mar 2022 to 30 in Sep 2026.
What does Rensair do?
Rensair works in industrial air solutions, with 14 recorded offerings and customers in healthcare, transportation, education and office. Its main offerings are air quality ecosystem development, HVAC system commissioning services and air filtration solutions implementation.
When was Rensair founded, and where is it based?
Rensair was founded in 2020 and is based in London, United Kingdom. It has about 30 employees, up 43% over the last year.