1. I wouldn't and don't cool, it's not needed and it just opens yourself up to RIs.
2. You could very well need a vet visit to clear up the RI, they are deadly.
I don't let my cool side temps drop below 75 ever. I had RIs when I let them drop to 70 on the cool side, I won't make that mistake again. I haven't had an RI in two years now that I don't drop below 75 *knocks on wood*