Plants in danger of freezing, Help!!

i'd like to start off that i at the time of writing this i have been awake for 36 hours. this is because I am a college student in the middle of finals. I had to pull an all nighter to study for this philosophy of religion exam.

on to the plants:
a. i know i need pictures, i don't have them right now for reasons above
b. one of my plants, the largest one (coincidental?), seems to have excess water in the soil and due to the low, below freezing temperatures as of late (im in wisconsin growing in an attic cubby hole that has no insulation) the soil froze. I think I discovered it in time and will be able to save the plant and roots. Because the water in the soil froze the plant has dried and looks extra thirsty. ie - super droopy
c. for the time being i smooshed around the dirt and broke up the big chunks of frozen soil.
d . this didn't happen to my other smaller plant, that is maturing faster than the other one, and i thinkits because the soil didn;t have enbough eater to freeze.

E. what in the name of Bob Marley should I do?!

get a little space heater to heat up the area...you can get a cheap one at walmart.

i would say a space heater would work decent ... but is a little more expensive to buy+the electricity. i would go and buy about 5 emergency blankets from the camping section in walmart only 3 or 4 bux each ... and create an enclosed box just big enough for your lights and plants using multiple layers of the mylar emergency blankets. after you do this monitor the temp because it will get suprisingly warmer just because of the heat from your lighting. even an incandescent (regular cheap house bulb) will bringtemp up in a room up to 4x4x8 considerably... try this out u wont be dissapointed.

PS mylar emergency blankets are also one of the best things i know of to reflect light in a grow box/ increase lumens reaching your plants

i'm just gonna move them into my closet. now.