I haven’t seen any weasels, opossums, or any kind of rats anywhere actually. And any nearby dog would not be able to jump high enough. Any nearby cats are too afraid to approach the porch and my family has pet cats too but our cats are afraid of the chicks. All I’m concerned about is the temperature because my siblings and my parents don’t really recommend having the chicks in the house. Our house is pretty small so it’s hard to know where to place the chicks.
Just because you haven't seen a weasel or a rat or some other predator doesn't mean they're not around. I've never seen a raccoon around my coop, but there's clumps of raccoon hair that prove they've been around, for example.
In lieu of the house, do you have a shed with electricity? An enclosed garage? Is the coop already built (it's actually an ideal spot to raise chicks since they'll be living in there)?