Sadly, my ducks completely refused to live indoors and settled by the side of our pond. It has a good flow, and now that our property is fenced, we have few worries about predation. I don't get many eggs, since the crows usually find them first, but I don't have to worry much about cleaning their house. They do dabble at the edge of the pond and have increased the diameter about a foot a year for the last three years. Eventually, that could be a problem (since one side of the pond is a dyke that is holding the water at the current level), but for now, everyone is pretty happy even in the depths of winter. We did put up a shelter made of three or four bales of hay to provide a wind break, and they occasionally duck in there, but generally they just prefer the open skies and fresh air.
The chickens took over the duck house, and I use the deep bedding method for them, only having to empty out the wood shavings once or twice a year, since my chickens also prefer to be outside until there is snow on the ground.
Ducks are messy! I imagine I'd want to blast the floor with a hose if I had them inside. I wonder how people keep things clean . . .
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