Gee Dave, I really don't know and hate to advise on either alternative. I do know that spicatum will grow well in either intermediate or cool conditions but neither is a strict cool grower. We had a cold snap (a real winter warm-up to you guys out in the Northeast) here last winter and my greenhouse got down into the 40's. It only damaged some of the Phals. The spicatum did just fine and had a number of inflorescences this spring. If your plant has been taking the 45 temps OK for a while it may do just fine. I would worry about the amount of light at a window. Perhaps someone with more experience with your species will comment. By the way Dave, these can make really impressive specimen plants. I saw an Arpophyllum a few years ago in a 14" pot. It looked like a small lilac bush! Good luck.
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