Set up misters and call it good.
I was thinking about misters too....
How about harbor freights small green house?
http://youtu.be/HlKrzBKVQJg
I guess one question that hasn't been asked is whether or not you are available during the day to tend to a small greenhouse?
I'm retired so I can go out often and check the temperature/humidity in my little greenhouse and use the mister on my hose nozzle to help regulate things. Last winter I packed it with my seedling experiments - mangoes, papayas and avocados.
I mostly use mine for seedlings and have moved it several times to find a better spot in my yard where it won't get hammered by the sun all day.
This is a hobby for me and it's supposed to be a fun learning experience.
I didn't have the budget or the space to buy a large greenhouse with a heater, automatic vents, cooling fans, overhead misters and a dedicated electrical service - I just wanted something that would help my seedlings along and keep them safe from the nighttime critters.
Do your research, buy something you can afford to lose, experiment with it, have fun and remember that if things don't work out you don't have to let us know, but if things do work out well you can brag on it.