Its usually above 32 degrees? in Ohio? are you sure about that?
I dont think there is anywhere in Ohio that is that warm..
your winters are probably the same as mine, im in Western NY..
Most of Ohio is zone 6..you have several months where its well below freezing, especially at night,
and you have stretches of many weeks where its below freezing during the day as well..
I dont think your idea could work..sorry..
IMO the rather severe warm/cold variations from going inside to outside, over and over again, could be quite a shock to the plant..
It would be going from 30's outside to 70 inside, then back out, perhaps 100 times over the course of the winter..
and for the spells where its below 32 for weeks, even a month, at a time, 70 degrees inside will simply be far too warm for
that long of a stretch..
If you are thinking that its only going to get below freezing maybe once or twice a winter..sorry...
but that's simply not the case in Ohio..
Here is a chart I made a few years ago, this is for Rochester NY, I cant imagine your winters would be much different:
http://gold.mylargescale.com/scottychaos/CP/temp-chart.html
Its below freezing more than 50% of the time between November and March..thats 5 months..
IMO, your plan of bringing them indoors when its below freezing probably wont work well..
plus, you would need to be watching the temperature *every day* of the winter, for 5 months, and only keeping them outdoors
when its above 32 degrees..which will only be about half the time..the other half of the time it will be 70 degrees indoors..
I dont see any way that could be a successful dormancy for the plants..sorry..
Scot