I'm leery of windmill only aeration, and here's why.

A client has 3 ponds on his land, all about the same size. All have the diffusers set up in the ponds identically, deep for summer, shallow for winter. One is aerated by electric compressor only, one by windmill and electric, the last one by windmill only. In February 2012 we had a 2 week period of heavy overcast days, fog, and no wind. There was about 6" of snow on the ice too. The windmill didn't turn enough to keep the water open, and it re-froze. Fast forward to the beginning of March or so. We saw an approximate 95% fish kill in the windmill only aerated pond, no dead fish in the other ponds.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).