Hi, I don't have a problem with airing the house. I can open several windows due to having mesh screens on them. Great idea for people with indoor cats. I am a breeder of Siamese and do not let me breeding cats go outside for reasons mentioned earlier in the discussion. The cats are happy as they have everything they want and need indoors. There are 2 or 3 companies who make these screens and they are terrific.

As for feeding, my cats get the best quality dried and wet food but nothing special for indoor cats. You can buy indoor cat food but I don't think it is necessary.

I have a few cats who live in a different part of the house and they have free access to go out in the garden but then I live nowhere near a road. I have the ideal spot for cats. Unfortunately most people are not so lucky.