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If your attic is cold - insulation in floor not roof - then the unit or water supply or drain tube would freeze. Try the regular unit in basement one and it will probably work fine. If it doesn't then perhaps you might consider ditching (getting rid of) the entire unit in the attic. Your furnace and AC unit could very well supply your upstairs if you made it a third zone. If you can get a supply duct up there to feed the existing duct work then you might consider it. Depending on your exact situation, I might be wrong - but I have seen these setups, mostly down south and I don't like those attic units. Zones can easily multiply the effective sq. ft. coverage of one system. FYI I don't bother with measuring RHumidity. My house if well insulated and I figure that the furnace doesn't come on enough to get over 40% or get to dangerous levels. If you are getting condensation and too much moisture then turn it down. Most humidistats that come with the units are rudimentary anyway. You would have to pay extra for a good one to tell you exact hum levels. Besides, the target rhum. level changes by the minute depending on outside temp and hum levels. Don't get too caught up in exactly what % you are at. My humidifier makes an incredible difference in comfort in the winter. No dry hands or throat, etc. etc.
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