Hi, So we have a tortie cat who has access to the garden with her catflap. At night we keep her downstairs because she has the lovely habit of bringing mice onto our bed to play with. We're about to get a sphynx kitten, we know she's got to be an indoor cat. Do indoor cats try to get outside? Will she attempt the cat flap? At night I think she will have to be kept upstairs so she doesn't go through the cat flap. But then I don't want to restrict either cat to a certain part of the house. Would a sureflap microchip catflap prevent this all, if I don't program in the sphynx cats chip? How does it work in the summer with having doors and windows open when it's hot?