I have scoured everything I can find in regards to whether it is better to buy combination smoke and carbon monoxide (CO) detectors or, if it is better to have them separate devices.
I have not been able to find anything on that exact topic. I did find a lot of information on placement of CO detectors though;
We are most likely to succumb to the effects of carbon monoxide poisoning while we sleep, so place them near your family’s bedrooms. If you only have one alarm put it closest to where you sleep.
If your furnace is in the basement, make sure you have a detector there. If you dry with a gas clothes dryer, put an alarm in the laundry room.
Detectors should be approximately 5 feet from the floor according to experts, whereas smoke alarms aren’t supposed to be more than 12 inches from the ceiling. I guess this kind of answers the question for me.
I’ve determined that I’ll keep them separate, check them monthly and, replace batteries when I turn my clocks for daylight savings twice a year.
Remember, have two exits for every room and practice your plan with a fire drill!