Help!!
When I turn on the airconditioning my whole house smells like cat urine. And yes I do have cats,but this has only started about 1 month ago,and I have had the cats for 10 years

Sounds like you have dirty sock syndrome. That means that bacteria/mold and other nasty stuff is growing on you evaporator coil inside your house. If you have access to or know how to access the coil you can clean it with coil cleaner or 409/fantastic cleaners. The biggest thing is to make sure to kill the stuff then rinse the coil to flush the pan out.