Well, they can seize a lot of things because of reciprocal anti-terrorism money laundering agreements with most of the countries you’d want to trust with your money.

resources aimed at wealthy people offshoring their assets might be useful to you

well, first you would need to set up a brokerage account outside the US, and move your money over to it…

For now, though, you can invest in an Ex-US ETF, Vanguard has one that is essentially the total world stock index minus US companies. https://investor.vanguard.com/investment-products/etfs/profile/veu

Zigbee or Zwave temperature/humidity sensors are common. Add a 3-circuit relay box and you can simulate the behavior of pretty much any thermostat with a few rules.

HA or any other system that can toggle outputs based on sensor thresholds would work just fine.

there are some subtleties with real HVAC thermostats, like running your AC compressor at least five minutes and ensuring that it stays off for at least 5 minutes when it’s turned off.