The "smart" thermostat stuff is scary. I have Haier minisplits in my house and they have some "smarts" built into each head unit. The way it works from the user's perspective is you connect to the device in the GE Home app via Bluetooth, enter your WiFi network's credentials, then the minisplit joins your wifi network and phones home to GE Cloud. Then your GE Home app can monitor and control your minisplit via GE Cloud.

I haven't done anything to analyze it further, instead after trying that out once I promptly changed my WiFi password and never looked back. The long term solution will involve some ESP32s, AHT20 temp/humidity sensors, and IR rx/tx.

But it just occurred to me reading this that if there's a similar vulnerability in HVAC system controls an attacker could cause one hell of an unanticipated power demand spike.

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rpcope1 5 hours ago | parent | next [-]

This is honestly why it's important to insist on Z-wave or Zigbee if you don't have control over the device firmware and must have smart controls. Why people don't seem to understand now that if it's "WiFi" it's suspect at best, I'll never understand.

	▲	jorvi 4 hours ago \| parent \| next [-]
		This, pretty much. The ideal setup is having a separate vlan for your IoT things, that has no internet access. You then bridge specific hubs into it, so the hubs can control them and update their firmware. If you have IoT devices that are unsafe but cannot be updated any other way, you can temporarily bridge the IoT VLAN to WAN. Honestly, what IoT stuff needs is something similar to LVFS. Make it so all the hubs can grab updates from there, and can update any IoT device that supports Matter. It would also serve as a crapware filter because only brands that care about their products would upload the firmwares.
	▲	thangalin 4 hours ago \| parent \| prev \| next [-]
		I replaced all my thermostats for both of my homes with Sinopé products. Here's the hardware, software, and setup: https://news.ycombinator.com/item?id=45145220
	▲	jcgrillo 4 hours ago \| parent \| prev [-]
		None of the existing smart controls stuff I've found really does it for me. I'm trying to build a hybrid heating system with 4 hydronic zones and 8 minisplits. For my HVAC controls the design is converging to a round mechanical Honeywell thermostat for each hydronic zone with a "smart" thermostat (no cloud) wired in parallel--TBD whether buy vs build. For the minisplits I'm building my own thing that can speak their IR protocol, which will also double as a per-room temperature sensor. It all gets tied together with outdoor temp sensor via HomeAssistant. So if all the "smart" stuff fails, the trusty mechanical guy will keep the house from freezing. There are halfway decent hybrid controls available for ducted systems but you can't afaik buy anything off the shelf to merge hydronic + minisplits. And as far as I can tell, none of the off-the-shelf smart thermostats has any built in analog backup. I view that as absolutely critical for my use, if the power goes out and I'm not around I need to be 100% certain that when the power comes back on the heat will also. EDIT: Digging around a little more it seems that Mitsubishi H2i minisplit systems don't speak zwave or zigbee, neither does Haier Arctic. I'm not 100% sure if that's accurate, but I haven't been able to find any documentation in the affirmative or negative. Those are the two heat pump options available locally. I'll be remodeling a small barn into an ADU this summer, that project will be more amenable to a forced air hybrid system, so maybe I'll be able to get away with a Honeywell smart zigbee capable thermostat that can drive it.

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irishcoffee 4 hours ago | parent | prev [-]

Edit: misread.