HeatPump VS MHI-AC-Ctrl

I think we are talking about different machinery (or maybe different levels of control). What I meant is something like https://github.com/SwiCago/HeatPump , but officially supported.

SwiCago has references for hardware to buy (I used this to get the premade pig tails)

I have four of these units. Not sure of your tech comfort level, but I didn't want to pay $200+ per unit for the Mitusbishi thermostat, so I got some ESP32s and programmed them with this library. Now they're fully controllable using my existing Hubitat setup and a driver I wrote.

Brought them all into Home Assistant using ESPHome https://github.com/SwiCago/HeatPump

Nice, I'm also using Unifi NVR. For thermostats I use ZigBee temp sensors and built ESP32 boxes to control and give the temps to air handlers using swicago -- no actual thermostats on the walls. For sound I'm using Chromecast Audio for sources and proper amps/speakers. Unfortunately for shades Lutron has the best, which means dealing with their proprietary junk. If you can get the QS processor they are phasing out, you can use telnet (called LIP) to control it. Otherwise with QSX they've made it impossible for DIY, it's undocumented and unnecessarily complex in the name of security -- security I do not need on my secure LAN. Lutron also has nice motion sensors and (Palladiom) keypads, but I don't use them for lighting, ironically. Other shades like Somfy may be good enough at a fraction of the price. For circadian lighting, if you end up going the ZigBee route and forgo full color, the adjustable white Hue bulbs are cheaper. Savings can add up if you'd doing a lot of bulbs.

If you don't want to use the cloud, you can directly interface with the minisplit: https://github.com/SwiCago/HeatPump

Yep, I'm relatively new to Home Assistant but love it. Combined with ESPHome, I've got most of the lights in my house controlled (via switch changes, not smart bulbs), and my all my air conditioners via the MHI-AC-Ctrl project[1,2] (which is fantastic - ordered the boards from JLC-PCB, parts from Ali-Express, told ESPHome to program everything and plugged them into the ports and...it all just worked!).

Just got a Mitsubishi Electric (which is different to MHI) and a Daikin at my parents house to get online - but code for both exists and I suspect the MHI boards can be reprogrammed to fulfill the role without any hardware changes.

It's incredible that the future we wanted in like, 2010 can be had and had without selling your soul to the cloud: I can leave the house, and turn off all my lights and AC's while walking out the door, or get notified if I've left my garage open - without a single cloud provider dependency, all open-source.

[1] https://github.com/absalom-muc/MHI-AC-Ctrl/

[2] https://github.com/ginkage/MHI-AC-Ctrl-ESPHome

https://github.com/absalom-muc/MHI-AC-Ctrl Although Mitsubishi HI (heavy industries) is a different company to Mitsubishi so may not work