I would suggest that orchids (like Paphs) that like to be continuously moist be in smaller containers, otherwise you'd be watering the top most LECA almost everyday in a larger container. Larger plants, of course, would go into larger containers. Actually you CAN overwater in SH, I've done it. Like any potting media, you need to learn it's wet/dry cycle in YOUR growing conditions, which, of course, will vary with the seasons.
I live in Montana where the temps COULD get down to 20 below zero in the house (if it weren't for the furnace running constantly! ;-) My Phals do quite well in SH w/out heating mats, but I would assume they would enjoy the extra warmth. All my electric outlets are in use with lights in the winter, however.
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