Before you make blanket recommendations for CO alarms all over the place, you might want to find out which application they are better suited for: life and health safety or door stops. Yes, many off the shelf alarms are junk. The reliability of current listed CO alarms is appalling. I suggest you visit some web sites and do your own research.
CO
Carbon Monoxide Headquarters - Home Page
Carbon Monoxide Saftey Association
Carbon Monoxide - The Silent Killer
Welcome to the Training Room
The only two low level CO monitors that sense and alarm at levels less than 70 ppm are from CO Experts and The National Comfort Institute. All those alarms in your local store are listed to UL 2034, which does not afford adequate protection for chronic low levels of CO or the reliability of these two brands. While they are a lot more expensive, what is you life and the lives of your children and spouse worth?
Get informed.
I invite DavidRs comments on this matter as he not only feels strongly about it as I do but, like me, he's into testing and correcting problems that often go unnoticed. David is extremely knowledgeable and qualified to address this mater. David??
Happy reading,
Bob Harper