I've thought about that a lot recently as I have a double cylinder deadbolt I want to replace our single cylinder one with, since the door has 3 panes of glass

I've thought about that a lot recently as I have a double cylinder deadbolt I want to replace our single cylinder one with, since the door has 3 panes of glass that can be easily smashed allowing the single deadbolt to then be easily opened. Sounds great until you think about a fire situation. I think we're just going to keep an extra key very close by but that solution only works because we don't have kids; I'm not sure I would go with the double cylinder deadbolt if we did. (And yes I know it's against the building code but I also know people regularly do double cylinders on their own personal homes. You'd never do it in a rental, AirBnB or commercial building of course.)