Now that I live in Z5.... and would just love to get 1-3 in the house.

Can you recommend any species that may THRIVE in the home? I'm even considering a good sized specimen, if I am sure it isn't doomed.

I can offer full direct morning OR full direct afternoon sun, elsewhere is fairly dark and less hospitable.

Thanks, for any tips!

Like you, I live in USDA hardiness zone 5 and I've had very good luck with C cooperi in my house during the winter and outdoors during the summer. However, I dote on the thing when it's indoors, as you'll see. I keep my house on the cool side during the wintertime (63F [17C] in the daytime, 55F [13C] in the nighttime). Humidity in my house is normally quite low, so I augment the humidity with a Sunpentown dual warm mist/cool mist humidifier (model SU-4010), placed directly beneath the fern. I only use it on the cool-mist setting. I use a slow-blowing fan to disperse the mist upwards. I normally maintain the relative humidity in the fern room between 55 and 65 percent. To accomplish that, the humidifier runs on an intermediate setting 24 hours a day. The water vapor is taken up by furniture, carpet, condensation on the windows etc, and also disperses into other areas of the house. Therefore, the reservoir needs to be replenished every twelve hours on the setting I have it running on. See the fern pics I have on flickr: www.flickr.com/photos/anderse79 The fern room doubles as my family room, so I spend a lot of time in it. At first I didn’t care for the moist air, but I got used to it! The walls are plaster-covered lathe and I haven’t had trouble with condensation or mold or anything like that. When I bring the fern inside, I stake the fronds and train them to grow upright; otherwise the fronds get in the way of foot traffic. The fern is in an east-facing window and gets bright light in the morning and afternoon. I always let the fern’s pot stand in a centimeter or so of water, and the soil is therefore always wet. I almost never water from the top, and I mist the fronds whenever I think about it, once or twice a day. I move the fern outside into a sheltered, mostly shady location in April and bring it inside in mid- October, before the first frost. I fertilize with a weak fertilizer every watering during the warm months, when the plant is outside. The plant grows faster outside than it does inside, but still I would consider these plants troopers overall. Our summers here are humid and mild, with comfortable daytime temperatures in the high 70s F [~25C] and nighttime lows in the 60s F [~16C]. However we sometimes have hot spells and the temperature can soar to 90F [32C]!! The fern takes the high temperatures well, probably because it has acclimated to the warm weather by that time and the humidity is also high.
As I said, this treefern specimen hasn’t given me much trouble, and I’m sure anyone living in the Great Lakes climate would have success with them if similar allowances were made for their care! It seems the key requirements for overwintering indoors are to never allow the plant to dry out and maintaining constant high humidity. As you know, these aren’t unusual demands as far as ferns go! I don't know how much $ you want to sink into keeping your tree fern as a houseplant... As has been mentioned in other forums, any plant can be made to grow anywhere, the question is whether the benefit is worth with the cost. I think the benefit is worth the cost, because tree ferns make striking winter houseplants and guests never fail to be impressed by them! It’s up to every individual gardener to decide if a $22 treefern is worth a $75 humidifier, plus ~$3/month in electricity. If you are interested in obtaining a tree fern and you live locally, I bought mine some time ago from Gilmore’s Greenhouse in Warren, Ohio. Briefly, this treefern specimen is more robust than I thought it would be, and should survive and grow slowly indoors in the wintertime if conditions are as indicated above. Good luck and post questions if any!
P Anderson
Cleveland, Ohio