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Air-conditioners typically account for 65-70% of the electricity consumption in international schools in warm climates.

90% of the energy used by ACs is consumed by the compressor, the regulation of which is very crude.

Herein lies an opportunity for significant savings.

Most ACs use a single temperature sensor (thermostat) which results in the compressor doing unnecessary work, and the temperature in the room being either too hot or too cold.

Coolnomix is a device that can be retrofitted on the wall next to the AC unit to minimise wasted energy and deliver better temperature control. It uses dual temperature sensors and a patented ORS (optimised refrigerant supply) AI control system to continuously optimise the compressor run time.

Over 20,000 Coolnomix devices have been fitted worldwide for clients such as HSBC, 7/11, McDonald’s, and JW Marriot.

Coolnomix can be installed in 1 hour, has a 3-year warranty, and can improve energy efficiency by over 25% with a payback of 2 years or less.


Emma graduated with distinction from Rhodes University with a Bachelor of Science in Zoology and Biochemistry. Since graduating, she has worked in the education sector throughout Asia.

She has experience in Nature-based Solutions for Disaster and Climate Resilience, SDG-Academy. In Emma’s spare time she wrote for an environmental think-tank, covering topics ranging from sustainable diets and lifestyles to biodiversity loss and conservation initiatives. Through her work at Metanoia, Emma is fulfilling a lifelong ambition of working in sustainability for education. She is currently working on applied sustainability audits in schools with the aim of helping them become net-zero institutions.

Her areas of interest include sustainability education, biodiversity loss, sustainable diets, and plastic pollution.

Kiran is an Environment and Sustainability masters graduate from Monash University, Australia. As a former digital marketer, she has experience in project management, campaign execution and brand development for multiple start-up companies.

Through Metanoia, she has applied her knowledge in sustainability communications and stakeholder engagement to drive behaviour change and whole school engagement within schools across Asia. Kiran also brings waste expertise to the team from auditing, reporting and providing innovative and circular solutions. Outside of work, Kiran likes to engage in environmental activism; from working with non-profits to reduce plastic pollution, to advocating for animal rights.

Her passion lies in water sanitation and sustainable agricultural practices.