I am looking at CO detectors for our house now. We didn't install any when we built it.
The digital display is a must.
What are the meaningful differences between UL 2034 and UL 2075, tested vs. listed?
What is the proper mounting height? I assume breathing level (5').
How many should be installed? We have a gas dryer on one end of the house, so one outside the laundry room. We also have a gas cooktop, so I assume one outside the kitchen area which is also just outside the master bedroom. What about one in the garage? The gas water heater is out there as well. Maybe one just inside the garage door?
All Kidde products are made in China so they are out.
Macurco (owned by 3M since 2006) are supposedly made in the USA.
I don't know where Senco CO alarms are manufactured.
American Sensors, First Alert, and BRK Electronics (same parent company, Dicon Global, for all 3) are all made in Mexico.
Costar is part of Quantum Group in San Diego (http://www.qginc.com/). I don't know where their products are manufactured. However, to find a list of distributors, send an email to a Yahoo email address. This doesn't inspire confidence.