It looks like hardwired WiFi enabled carbon monoxide detectors for the two HVAC units in the attic and basement, then a mix of WiFi and RF detectors (battery powered predominantly as it would be very hard for me to hardwire smoke detectors as this is an old house with plaster walls) on each of my two main floors and outside each bedroom. Just to clarify, are carbon monoxide detectors required under your county's regs? And is there some reason why you think an elaborate one would be necessary for a standard HVAC system? You can buy a plug-in one on Amazon for literally under $25. Also, are you certain you need one? I had this argument with Airbnb a while ago now, but when I had units in their Airbnb Plus program, a carbon monoxide detector was mandatory – except my building had 100% electric heat & hot water, and therefore literally zero carbon monoxide can be produced by it. But if you use natural gas or heating oil for heat, then yes, you likely need one (but plug-in is fine). After seeing some posts about guests tampering with smoke detectors to try to get refunds, definitely tamper proof. I've said it before, but you should not assume anything discussed on this thread is at all common. I've been hosting multiple units for nearly a decade, and I haven't had a single guest try to fuck with a smoke detector. I’d also appreciate your thoughts on a notification hub/center to manage these and the other devices we all use. To clarify, are you getting notifications from existing hardwired devices, or the battery-powered ones you said you may need? The battery-powered ones obviously detect smoke, but that's not the same as also having sufficient power to somehow alert you via phone or text or something. It's usually a built-in alarm system of some sort (for burglars as well as fires) that comes with a built-in cellular connection for notification purposes; batteries would otherwise drain too quickly.
