I like clean sheen for daily hair care. I would not rinse after conditioning, things like Kleen Sheen and Double Dip do not need to be rinsed out. I would tend to stay away from the Stimulator for daily hair care, I have used it some on show day or day before to get the hair to really pop, but the stimulator has linament in it to make the hair pop and if overused can actually burn the hair off of them.
For your "cool room" if it is hot and all the windows are covered etc, are there doors on either end of barn to create a tunnel effect? If not I probably would not cover the windows, may get a little hot in there if there are just openings on one end of the barn for a breeze. The misters and fans work great if you dont have access to an actual cool room, we dont and have great hair with just using the fans and misters in the hot part of summers. My suggestion is put your misters on a timer so they come on and run for 20 minutes or so with half hour or so gaps in between, if they run all the time you tend to get a real mess in your barn.
My daily routine goes something like this depending on how much time I have. If its really hot I will rinse them good in the morning, blow them to get the excess moisture out, but leave them slightly damp, put them under the fans and misters and leave them there. If it is super hot and you are home I would go out a couple times during the day and run cool water over them, especially around the neck, legs, brisket, belly, run cool water over them for a while to lower their body temperature, I ussually say 10-15 minutes or until they are cool to the touch, then again knock the excess water over them but leave them slightly damp and put them back under the fans. (Note: I never leave a calf even slightly damp unless they are going to be on clean shavings and under fans.) Then in the evenings I will pull them out, run the blower over them to knock out any dirt or debris that is down under the hair, rinse them good(shampoo once a week or so), while they are wet I use my rice root brush or a scrubby on them and work all the hair forward, and then I will really use the rice root or a roto bruch on their legs for a while to really get that hair trained and to stimulate the follicles, after that I would blow them out pretty good, then spray my conditioner in them, then take a brush or scrubby and work the hair good after I put the conditioner in to their skin, then if needed I will run the blower over them to get the dampness out.
As far as what temp to bring them in at, cattle have an ambient temperature of around 50 or 60 degrees, this means they are comfortable at that temperature so they need to be colder than that if you want them to GROW hair, I find that at around 70 degrees they will maintain hair and not shuck it, but not get a whole lotta growth. They need to be colder than their ambient temp in order to for that to signal their body to grow hair. Of course genetics plays a big roll in that as well, fed a Smooth Sailing steer this past summer that I swear would grow hair in the desert. Another suggestion I have is keep the hair clipped regularly, this allows for new growth and healthier hair in my opinion. I find that if yo just keep working and growing hair and never clip until show hair, it looks really fuzzy and doesnt clip well, can be really difficult to blend and get smooth lines in. This is my routine that works well for me.