Those are the kind of misters I use also- they are cheap and only need a tap to hook up to- no pump.
You can buy them on e-bay and get a set with many nozzles and tubing for $35-$50 or if you want fewer nozzles you can get for $20-$30.
My recommendation to the OP- get a large screen cage for outdoor use and keep him outdoors 24/7 as long as temperature is above 50 degrees. That's what I do (50 for panthers and most other species, 40 for veileds and jacksons and other cool tolerant species).
Just make sure you are home when days start getting really hot so you know things are OK in your cage or wait until the weekend when you are home to test your cage in the heat.
One of those nozzles over one shady part of the cage can provide a cool shelter and will reduce the temp near it even if there is no mist directly. Make sure you have shade as well as sun, and dry as well as damp.
For some species (melleri jacksons) I have run the misters up to several hours per day if the day is hot. For others (panthers, veileds) as long as I run it for a little while during the heat, they are fine even in very high temps (90s), as long as they also have shade.