Wrens are the worst for picking odd places to build a nest...which BTW is done by the male. Once the eggs are hatched some"moms" takes off leaving Dad to care for the kids while she "does the do" with another male. Every year I have a nest under the top on my propagne tank. Had one in my GH too. Happily the eggs hatched when it was OK to put the plant outside, which I did next to the GH door so it was easily found. The best ?? place was on the window ledge of the bathroom (brick on block house). Was inbetween heat and a/c season when ya never know which needs to be turned on. Anyway that window had to be left open because of the nest. The eggs hatched and the babies woke me each morning yelling for food. Was a fun time in the shower...where the window is...watching Dad bring food and feed them. And no one seemed to mind getting sprayed once in awhile