I think there are several factors working here. I think using the mist just to cool it down is making it too moist as one person said. Also, I'm sure it is still getting too hot. Orchids like good air movement, and if all you have ius a small fan in the wall, that might not do it. You have been given a lot of good ideas already. I'd think backwards on this. How much did this greenhouse cost you, and how much room in your yard do you have for doing this hobby/business? I have been growing some plants in homemade greenhouses for 19 years now and for what you might have paid for the greenhouse, you could probably make something like Gary mentioned. The wood frame covered with 5 year poly works real well. I roll up the sides during the year and only close it down during the winter, and still I also have vents to open after every morning it is closed down. I remember one day when it was 50 outside at 1pm, it got 125 inside. The plastic was puffing out like a ballon and when I opened a vent, it was like a 30 mph wind coming out. Anyway, bigger fans would be good for orchids and maybe hold off on all the extra moisture for cooling which might have a tendancy to rot more than help. I am familiar with Bunnell, I have made 2 presentations there in the last year. It is cold at times, but the home made greenhouses would work good there. I had 21 last season and have hade 19 since I built my first greenhouse and my tender plants have come through nicely. There is so much that can be said about this subject, but I guess thats my fast 2 cents, I have to go out and spray some roundup, weeds are getting too tall.

Kinda looks like Frankenstein's laboratory lol (or my Grandmother's windowsill). In a good way though. What is the second to last plant? :)

Pug, it was about a week for those roots. Jsainz, it does not say that it has rooting hormones in it, but it does say not to use with rooting hormones. I mispoke - it's best used with softwood cuttings and leaf cuttings. Does say on the box that the gel doesn't need to be washed off, but because I plant in hydroton I probably still will wash it off. Put a couple of other cuttings in it- thomsonii and sadly I can't remember what the other one is even after looking at the leaf again!

A trick I use is I start trees/bushes in a pot full of sand and cover them with a fruit jar or any old glass jar to control humidity. If you don't have an old jelly Jar around I would use a plastic bag. Any rooting gel or powder should work some better than others. I use clonex myself just as a preference. Some people use a heat mat at 70 degrees F but I usually don't because I don't have one. Just keep the temp in mind so if you are starting half a dozen perhaps keep them on top of the hot water heater while they root or beside a heating vent in the house. I started a bunch of date seeds that way once just to see if I could. In that case I wrapped the seeds in a paper towel and used a one gallon plastic bag and they sprouted in two weeks to a month. We started rose cuttings once by accident when the neighbors trimmed their roses a few sticks wound up in our compost pile under a bunch of leaves etc.. and they are still beautiful rose bushes.