When you say 'rescued' do you mean the plant was not watered for a long time and is on its death bed?

Im pretty new to this but have read quite a bit. Here is what Ive gathered. Most junipers do not need a long or any dormancy period. They grow fine out side all year long from canada to southern florida. If its been outside so far this winter, Id leave it out. Cut back on the watering and dont put it in direct sun till it starts to grow again in the early spring/late winter. If you do not know when it was watered last, then water it.
If you put it in your fridge, it might shock it with the lack of light and very low humidity. I dont think the temp will shock it. Down here in zone 10, junipers are in full swing, so Id guess your only about 1-2 months behind or so. Then you could repot and see how the root structure is.

I have not read up on the Elms so I dont know their outside range. Since it is decidious, you might want to refridgerate that one, but I would take some one elses advice on that species.

Good luck!!

Depending where you live at, I always put mine in a basement window and then I put one of those plastic basement window covers on the inside of the window making a small mini-greenhouse in the basement. I do have to open the window to regulate the temp but that might make a decent transition area instead of the shock from warm to cold like the fridge. just make sure it's not a basement window with full sun! or your tree might get baked! also make sure they are on humidity trays and mist them once a day it helps.

As for junipers not needing a dormancy period... that is entirely false. That logic is what sees so many trees brought inside to their demise. The reason its suggested that junipers (and most other trees) be outside is so that they DO have a dormant period. Now there's discussion as to whether evergreens truly go dormant, but they definitely need a slow-down period.

It appears that the original poster is in Zone 7. Theres still plenty of winter coming, and presumably these trees were already outside at the nursery. You're only complicating things by putting the trees into a super-dry environment that could easily foster the spread of nasties. Leave these trees in a wind-sheltered spot in your yard and make sure they don't get too dry. (All your other trees you have listed as being in the fridge would do better outside also.)

WF