The amp draw for that cooler setup is about 1 amp (120 AC) for the pump and fan combined.
Solar panels - we have 9 Sharp 208s. Will never buy Sharp panels again! I will buy Mage units if we get the money to though. Since we are offgrid solar, they are much better for us. All appliances are off the shelf Lowes/HD type stuff that any house would have. The only thing that is 230 V is the well pump. which I want to not use, and install a solar pump over it in the well. The Mages I like are $490 each - HALF of what I paid for my Sharps back in '06!!
The solar pump will then pump up to 2 2500 gal tanks as raw water. From one tank, it goes into 3 levels of physical filtration, and ends up in the domestic water tank. That will also be 2500 gals. The other raw water tank would be for gravity fed irrigation into a wicking style raised bed garden setup. In addition, all 3 tanks would be plumbed in with 3" pipe to hydrants outside the house in case of fire. We have a gas water pump already. The stock well pump would stay in place, for redundancy.
The real beauty is the other 2 water tanks used to store hot and cold water with heat exchangers in them for summer cooling, and domestic hot water. These tanks would be 500 or 1,000 gals each. In addition, if anyone wants info on solar hot water, I should still have the info on DIY concentrated solar (parabolic) trough collectors.
Heat - I get FREE pallets from Earth First Recycling in the Stead area. He is on the east side of N VA, between Lemon Valley and Stead. There are also ads in Craigslist for pallets in town. Cut them up with a circular saw, and pull the nails out of the ash with a magnet after burning. I can fit 24 pallets into the back of a full size (shortbed/crewcab) pickup and still pull into the garage (8'X9' doors).
IF you are handy, I can get you info on building a waste oil heater - highest BTUs of most fuels. Cheap recycled (filtered and standardized) waste oil can be bought at Reno Drain Oil. They can deliver, or you can pick up.
Aubrey - this cooler should easily handle the heat, BUT I would set it up so that it blows in through the wall (from the outside) up high in the coop. Just put a little roof over the top of it (just in case it rains) and being outside will help reduce the concentrations of dried poop being sucked back through the fan/media. I will be working on a cleaner version of this, which can utilize a covered water supply. I think that may help you better also, as it will also allow for a more remote water tank. It may also be worth enclosing the fan, and using a dry filter in the air intake. It all comes down to money, and airflow. If it is fully enclosed, then the rain roof would not be an issue, as long as your enclosure is good.
If you have well water that is pumped near there, then it is also possible to move it so that all water pumped goes through a small heater core/radiator and is blown into the coop/shed/barn/garage. Whenever water is pumped up, it is about 55*F. This would work well with a solar pump that pumps all day.
Another idea for coop cooling, is to just use fans and plastic pipe/hose buried atleast 4' down. Have it blow into the coop, and draw air from a few hundred feet away, using some small fans. We have the room for it, but most people do not.
Also, do you have venting up high for the heat to escape? That will help greatly! My coop was a passive solar design, which I drew up on Google Sketchup. If you do anything with shading or passive solar - download the program!! It is free, and you can input your location so that it gives accurate shading/times/seasons.