I took drastic steps to get my house ready for a cat. My son was highly allergic but he insisted he wanted a cat. The doc told me several things I could try to help him with his allergy. I did almost all of them and we now have 6 cats and he's fine!
1. Got rid of every strip of carpeting in my house and replaced with hardwood and vinyl. The only carpet I have now is in my room.
2. I got 2 of the huge Ionic breeze machines, one for upstairs and one for downstairs. I clean them weekly.
3. Replaced my ac intake filters with HEPA filters. I got the kind that you just clean out once a month and replace. They are more expensive but worth it in the long run.
4. I clean, clean, clean and clean the floors constantly to make sure I keep the hair/dander at a minimum. I also dust almost daily especially in his room.
5. All of my cats are bathed once a month without fail! I have a schedule for it and I stick to it.
6. Last but not least I have him on Claritin, the Zyrtec did not seem to help him much.
7. His mattress is covered in a vinyl cover and I wash all of his bed clothes religously!
It can be done with a little less paranoya (sp?) But I don't want to risk making him sick and causing him to lose his best friends!
Good Luck!