This was probably CO not CO2? A CO2 monitor doesn't "go off", it just silently reports. CO would go off because it's deadly to have a CO leak.
replyMy portable CO2 monitor goes off. You can set a levels of warning on the aranet. It is a very quiet, non-disruptive alarm, but an alarm nonetheless.
replyI agree with OP. I don't always carry it along, but it has been a massive boost to my productivity.
Poor ventilation is mostly an issue in homes built or renovated in the 1970s, when the oil crisis led to ill-considered efforts to save energy. New homes typically achieve energy efficiency by using heat pumps in the ventilation system.
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