Bob -
You're right about the stove and oven. If misadjusted (probably indicated by a yellow flame or flame tips, an indication of too rich a mixture), they might produce CO.
But the stove and oven are used only for relatively short periods of time (not 8-10 hours at night, for example), and used while someone is awake to watch them.
This is one of the reasons why all gas stoves and oven come with a sticker that says DO NOT USE THIS APPLIANCE FOR SPACE HEATING!
Bill
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