you will likely spend a lot of time at first day and nite to check temps.....while the space heaters may keep you warm enuf at nite, the sun will want to cook your plants during the day....even in winter the temps can go up in a hurry in a small greenhouse so beware! 5 gallon buckets of water under the benches will help regulate the temp at nite, they will heat up during the day and gradually lose heat at nite....if you use gravels for a flooring it will assist with temp control also as well as humidity....misting system is a necessity, but be careful of the heaters, water and elec do not mix! ventilation is still very much needed in the winter months, so probly two fans for your size gh as well as an exhaust fan and intake shutter....automate everything you can to save your time....gl and enjoy!

Honestly, if your grow room is already trashed, then I don't see the need to move your orchids out immediately. I would wait until its safe to move your 'chids outside again. No need to tempt fate over the winter, especially with a mild to moderate La Nina settling in (think repeat of last year until February). I would keep them inside until spring and throw them outside then. I put mine outside on March 15 this year and it worked well. Then you can erect a shadehouse (much cheaper) until next cold season. When will you be getting a place of your own?

Well, so far everything is going very well, I have been able to keep the temp about 60 at the lowest at night, and during the day it does nicely.

After I read through so much info and really concentrated on the temps and how to get a hang of the weather here, I decided that moving the 100+ that I have now to the gh. It honestly so far has been a really good idea. I'm looking at a freeze in the next few days, but I'm going to get a few supplies for that tomorrow.

I did decide on the buckets of water and that has seemed to regulate the temp nicely. my accurite temp gauge, says that it's raining in there almost all the time, so I'm guessing that the humidity is right where it needs to be. I have a few spots where there is a little bit of a draft, and that's something simple enough to fix.

I'll post pictures of the inside of it soon, I have tons of spikes since I moved them out there, and I was able to get the house back into order before the inspection by the land lord.

I appreciate all the help and even some of the opposing thoughts, helped to really let me make my decisions!

Y'all are awesome!

San Antonio dry?!?!? LOL

Im from Corpus and spent plenty of time in SA and unless you are in the northern part, its pretty humid year round.

I would think a tiny electric heater would work on those nights you get frost on something that size.

Yep! That's what I was thinkin too!