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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Here's what I did at my house. I don't control based on dew point and I only have one HVAC unit, but you could pull this off with openHAB and Venstar thermostats. Venstar was the only brand I was able to find with a local API to control the thermostat. You can set up rules in openHAB to perform what you'd like. The rule engine is powerful and flexible. I'm not gonna lie. It's probably going to be a lot of heavy lifting to get it going but it's rewarding once you've set it up.
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Hence, a higher number means a more popular project.