ThailandAirGradient builds open-source indoor and outdoor air quality monitors that track PM2.5, CO2, temperature, humidity and other pollutants. The company is known for its open hardware and firmware, letting users build, repair and integrate the monitors with platforms like Home Assistant and its own dashboard. AirGradient appeals to people who want transparent, data-driven air quality monitoring rather than a closed black box.
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United StatesCielo is an American company based in Bellevue, Washington that builds smart climate control products for both ducted and ductless HVAC systems. Its Cielo Breez line turns mini-split, window and portable air conditioners that use an infrared remote into wall-mounted smart thermostats, while the Cielo Smart Thermostat range covers central heating and cooling. Everything runs through the free Cielo Home app with no subscription fees, and the devices work with Amazon Alexa, Google Assistant, Siri Shortcuts, SmartThings, IFTTT and Home Assistant.
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