rtl_433-hass-addons VS HassOS-Addons

Another option is an RTL-SDR antenna like this, paired with the RTL_433 add-on in HA. Then you can use any supported 433MHz sensors like this and this. 433MHz isn't a mesh network like Zigbee, but it does have longer range, doesn't require any pairing, and the sensors send updates every 16s, and take standard AAA batteries.

An RTL-SDR antenna like this attached to your HA server running this add-on, and a few 433MHz RF temp/humidity sensors like this and this.

Run one of the rtl_433 variants on your pi to capture the data, and Grafana/InfluxDB to handle the data once on your pi. (I use this version, but it was made specifically to integrate with HA.)

There's this one, that auto-discovers things. If you live in the middle of no-where that might be OK. Personally, there's like thousands of 433MHz around me (mostly car tire pressure sensors), so having HA ingest all of those would be a nightmare.

I'm using this add-on and a $25 USB SDR dongle to "listen" for the remotes.

Then there's this one, that makes adding sensors to HA much easier, as you don't need to add individual MQTT entities, and instead you just provide a few bits of info about your sensors to the add-on config, and it'll make "devices" in HA for you.

I've got an add-on for Home Assistant that makes integrating these and other 433MHz devices into Home Assistant super duper easy, too.

I use this add-on for HA OS. Plug in your SDR, add the repo to your HA OS, install add-on, follow instructions on setting it up the devices. It's about as easy as it gets. This guy's repo even makes "devices" in HA, rather than needing to set up each entity separately, with just a couple of lines of config per device in the add-on config.