you'll be fine. i don't know where you live, but here in Texas, brewing sux in the summer time. when i ferment, i'll set my carboy in my kettle, add water close to the tope of the kettle, then put a fan on it. i'll set a little timer on it to cycle on and off, just so it's not running all the time. seems to help temp's hold in the low 70's, upper 60's. plus i keep the house on about 72-73 anyway. have to remember too, when it's fermenting, it generates some heat. minimal, but adds to it.