Cymbidiums Inside?

[Paerata]

In my quest to have my Cymbidiums flower this year and following advice from the group is it time to bring the two of them indoors? I'm interested to know what the pattern might be with those of you in similar environments like Niagara Falls Ontario.
We had our first frost Tuesday night. I put the orchids under our back verandah putting them back outside in the morning.
My plan is to close off the heating vent of a south facing bedroom window and place to orchids near to it. I will leave another window, northeast facing open a tad and monitor the temperatures. I will ensure heat can't get under the door into the room.
Does my plan need any refinements?

[trdyl]

Years ago when had a standard Cymbidium I kept the temperature were it was located to a minimum of 34 degrees and had no problems flowering it in central Arkansas.