I am in the United States, max price is 150 USD (but ideally lower), Zigbee is my ideal protocol, but Z-Wave or a WiFi standard that doesn't go through the "cloud" works too.
Literally just something that does the HVAC wiring control for me safely and can be programatically controlled. I'm trying to make a home automation system that does not touch any "clouds" or "phone homes." Amazon is seemingly not helpful and technology stores tend to only sell the ones that send your info back to their own servers like Google Nest.