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They can go off when they shouldn't, but they can have a high false negative rate, too, which is why you should several throughout the house. Something like 30% of brand new ones might not go off.
Below 40degrees they can have trouble too. The upstairs ones up against the attic could be going off due to that. They get dusty, so some computer keyboard compressed air dust cans should help. There's also two types, ionized and something else- I forget the terms- but one is better for near cooking and hot steam from a shower.
CO detectors expire even quicker. They all have dates stamped on them. Do a little googling and get the same brand so you can just unplug the wires and plug in the new one. It's a lot more of a pain to have to swap pigtails for each one.
Just changed my whole house over for exact same reason. And wife.com and kids were home by themselves while I was traveling on business. Happy times...
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Ken
1986 930 2016 R1200RS
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