Ranchus/goldfish during hot summers

[Martin]

I've wanted some ranchu goldfish for a while but I never got any because I'm worried the temperature will get too high for them in the summer. Has anyone here had success with ranchus in Ottawa without airconditioning or a basement? I live in an apartment and it gets very hot in the summer. My tanks go above 85F fairly often, and get especially bad during heat waves. I don't have problems keeping the temperature right in the winter. I can't remember losing fish during heatwaves, but I only keep warmer tropical fish. Preferably I'd like to get 2 ranchus (alone, or maybe with a small cleanup crew) for a 46 gallon tank.