I don't think a Chicago winter would be any better than Canada. What would really do the trick, if you have the more prevalent form of Ich, such as Vulgaris (even a severe case) would either be South Florida or Hawaii in the United States.
You may want to try the salt bath that I hear so much positive testimonials about. I hear that it is great for exfoliating the scales. I may be in Hawaii, but I work in air-conditioning, and the scales (severe vulgaris) are present. I should try the salt bath, but I am paranoid about submerging myself in water for an extended period of time. Past experience tells me that it would be drying on the skin. I need to give it a try though.
Don't ever lose hope when
there is a promised land, and "sweat" dreams