Reddit reviews Kidde Ultra-Sensitive Battery Powered Carbon Monoxide Monitor | Model KN-COU-B
We found 2 Reddit comments about Kidde Ultra-Sensitive Battery Powered Carbon Monoxide Monitor | Model KN-COU-B. Here are the top ones, ranked by their Reddit score.
Provides warning of low levels of carbon monoxideDigital display shows Co levels as low as 10 PPMProvides fast audible and visual notificationBattery operatedUL 2075 listed
"Don't Compromise — Get a Low-Level Carbon Monoxide Monitor"
https://www.energyvanguard.com/blog/56595/Don-t-Compromise-Get-a-Low-Level-Carbon-Monoxide-Monitor
Kidde Ultra-Sensitive Battery Powered Carbon Monoxide Monitor ($65 at Amazon):
https://www.amazon.com/gp/product/B00IO64NXC/
Can you open all the windows for a few days and see if that makes a difference?
Do you have gas appliances? If so, consider purchasing a low level CO detector like this one.