I am getting ready to order my system and I am a little conflicted on how best to monitor smoke and CO2 - I have considered using the 2GIG Smoke detectors, but am unsure as to whether they are ionizing or photoelectric. I am thinking I would like ionizing/photoelectric combo units throughout the house and CO2 in each of the bedrooms. I have also thought about getting the NEST detectors since they communicate with each other and let you know which room has the problem (or which one is triggering an alarm), but at $100 each, that seems a bit steep.
I would thing that an ionizing/photoelectric combo in each of the 5 bedrooms, and maybe one in the living room and one in the upstairs hallway would be good, and then carbon monoxide detector at each end of the upstairs hallway near all the bedrooms.
I was also considering going with a FireFighter Wired Smoke Alarm Audio Detector (ECFF345) but have absolutely no knowledge of the product or its reliability. How far can this unit be from a detector and still trigger in the event of an alarm? Will it sense an alarm through a closed door?
Anyway, any info on this device or any suggestions on how best to monitor smoke/CO2 is greatly appreciated.