Setup
Technology
Celsius understands your thermal state, even when you are asleep. 128 ultra-high-precision, low-latency temperature sensors embedded in the Mat create a real-time thermal heat map for each person in the bed, delivering the most comprehensive temperature insights of any consumer sleep accessory.
Controls
Celsius offers the best-in-class heating and cooling performance, covering the full comfortable and safe temperature range. The surface of the mat can be cooled to 18°C in hot summers and heated to 30°C in cold winters. Heating and cooling can be rapid or subtle. The rate of change can slow down to 2 hours per 1°C change, or speed up to 2 minutes per 1°C change. The temperature sensor feedback loop, dynamic liquid circulation system, and high thermal conductivity cushion precisely maintain the surface temperature within a 0.5°C margin of error. This ensures you stay precisely at the temperature you need, exactly when you need it.
Down to
mat surface temperature in summer
Up to
mat surface temperature in winter
±
mat surface margin of error
Down to
mat surface temperature in summer
Up to
mat surface temperature in summer
SERA
Onethird’s Sleep Environment Regulating Algorithm (SERA) is an advanced AI inference model jointly developed with our Research Partners from the University of Melbourne. Throughout the night, SERA uses Machine Learning to assess your thermal comfort levels based on real-time and historical temperature data, so it knows whether you feel hot or cold, even when you're asleep. It decides the optimal temperature settings and rate of change personal to your sleep based on scientific modelling, big data analysis and your unique thermal profile. The decisions are executed in real-time as SERA operates Celsius's temperature controls to deliver the optimal temperature strategies.
More features
Set and forget, how it should be.
Auto start/off. The ultra-low-power temperature sensors can detect your presence in bed. Celsius automatically starts to optimise your bed temperature when you get in, and automatically ends optimisation when you get out.
Predictive preheat/precool. SERA learns your sleep patterns after a few nights and predicts the time you go to bed every day of the week. Celsius heat or cool your bed a bit earlier so the temperature will be perfect when you get in.
You'll love sleeping.
Together.
2-user support. Celsius Queen and Celsius King offer support for two users. So if your bed sleeps two, both of you can sleep at the optimal temperature.
Silent wake-up. Set an alarm for either or both sides of the bed using the companion Celsius app. Celsius will gently and silently wake you up with warmth and light taps.
Science
Celsius is rooted in scientific evidence and principles from the ground up. Our development is led by leading authorities in sleep, AI and engineering research. More than 330 overnight sleep studies are planned for the development of SERA in the Royal Melbourne Hospital Sleep Laboratory, John Trinder Sleep Laboratory, and participants' homes. Spartan, the University of Melbourne's High Performance Computing system, will power our data processing and model training. Hardware engineering and development are conducted in the Creator Space, the University of Melbourne's flagship fabrication lab in the Melbourne Connect innovation precinct.
Timeline
Jan 2026
Kickstarter Launch
Celsius presale available on Kickstarter.
June 2026
Goldmastered
Prototype, testing and compliance complete.
Sep 2026
Production
Supply chain secured and mass production begins.
Dec 2026
Fulfilment
Public launch and Kickstarter fulfilment begins.
Ongoing
SERA improvements
SERA continues to improve and update OTA.
Explore Models
Celsius Single
Celsius Queen
Celsius King














