Need advice on a pet door
I'm thinking of getting a pet door for my cat. Any advice on which brands/locations/strategies do or don't work? I've seen those that go into a screen door (which I don't think I'd like since the screen isn't always accessible).
I'm hoping to find one I can lock so the kitty can only go out when I decide it's OK. I was thinking of putting it in the door to the garage.
How do you install them? I'm not remotely handy so I'm guessing I'd have to hire someone?
And do they cause your heating bill to go up?
Has anyone had a problem where other critters besides your own kitties have used it to get in your house?
Any other general advice on pet doors?