I dont think you'd have any luck with any of them indoors.

Some of those plants can survive a mild winter in a tunnel outdoors in zone 6 or higher. I had a friend who grew chard that way in southwest Ohio last winter. Can you bring the temperature way down in the sunny room? I agree that it's unlikely any of them would do very well indoors, but you might have a chance if temperatures were very low, like say 35-50 F. And, like you, I like to experiment. I wouldn't invest much money into a project like that, but it might be fun to give it a try.

That's what I'm thinking. Worst comes to worst, I'll at least eat/dry them and that's better than a landscaping company ripping them up and tossing em. So far, everyone looks pretty happy. Gave the Chard a deep/big pot; the celery a wide one. The Collards have one my genuinely Huge Pots and so far isn't dying. The kale is kind of unhappy. Gave kale a 'normal' pot as I had run out of bigguns.
Ate the Carrots already once research said they weren't so viable.

This is kind of an experiment for me, and Maybe my trials of seeing how this goes can help other gardeners in a similar position. I'll keep it updated on my end.

Who knows? It's always better to try and be hopeful than to just give up?
Any other advice is always most welcome, as well. If anyone else does something similar, I'm soooo very down to hear your ideas. :)
Thanks for the feedback as well, Christine!

Oh man I can! It's a little rectangle box of windows, and I have another window nearby where I could move the chard so it gets lower temps and still good sunlight. Thank you so much!

I can't do a tunnel outdoors with my apartment's set up. (the garden area is the front lawn, I rent a one bedroom, the landlords would be angry)
And yeah- not putting any money into this project. Just seeing if it'll work.
My indoor herb garden's doing FANTASTIC so far, so there's always that. I just kinda want to see if I can grow some of my own food through a harsh winter with limited resources.

I think I am going to set up a separate post about the progess of this experiment for other people who might be thinking the same thing. I'll link to it from here when I do!

Here is a pretty firm gardening rule of thumb for you.......if it grows well outdoors in your climate, it is not going to grow well indoors. We simply cannot offer the correct outdoor growing conditions inside our homes for these plants to thrive. And that means even offering winter habitation for plants that are normally sensitive to excess cold, like many veggies.

fwiw, celery is even tricky to grow well outdoors. I couldn't begin to imagine the complications for attempting it inside!