bubble bucket grow

im about to start my first hydro grow, with 2 bubble buckets in a 3 hollowed out stacked rubbermaids, and i just had some questions.
how do i keep the water in the buckets the right temperature? im going out to buy fans for the grow box but im not sure if that will keep the water cool. also im having trouble germinating seeds, i dont have a heating pad, so it might not be warm enough, any suggestions?

Easy man, for the seed thing start them off in a paper towel and plate, put one layer of paper towel down put your seeds on top of it then cover with another paper towel. Make sure the paper towels are wet but not sopping u dont want a puddle of water on ur plate. Then cover with a decent size bowl and make sure the paper towel is all under the bowl. If u have to fold the edges in to get it under do it. Then put it in a dark warm place like a closet. 1-2 days later there ya go. An as for the water temp if there not to bad you can freeze a couple bottles of water and add them into the rez frozen. Then when they thaw swap them out with another frozen one. If u keep four bottles you can add 2 frozen ones and when they thaw add the other two and put the thawed ones back to freeze agin. That way you always have cold bottles. Best of luck! Hit up my grow in my sig, you can find me there anytime if u have anymore questions.