When a "smoke and/or CO" detector makes a "false" alarm, how would you know that it is a false alarm? I am trying to figure this one out? Especially for CO detectors.
How would I know that it is a false alarm indeed. Could it be a real alarm ?
How would you know that the siren is false indeed?
Is it better to buy a 10 year old in-built battery (you will never have to change the battery) for a stand battery alarm/an AC+battery backup detector? Or would it be safer to replace the AA size batteries every year?
Which is more reliable choice for a "battery alone detector"/"AC+ battery backup"?
you can buy a can of test smoke for detectors. If people have the ability to check and replace batteries monthly and very maximum annually, than replaceable batteries are cheaper. But if people cannot be bothered checking them, get the 10 year units, so after ten years, when they start beeping from lifetime expiration, they MUST be replaced. CO detectors are far more sensitive to false alarms, but if you suspect CO in the home, open all the windows for an hour or so and try again.
just a note about NEST, they are not recommended and will not pass any new inspection as they are not hardwired to interconnect, they rely only on bluetooth / wifi which will not pass building or electrical code inspection. If you do want NEST, then they must supplemental to the existing 3 wire smoke/CO sensor, unless the home is older and only wired with a single unit or not interconnected.
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