even in a conditioned huse a tub of water with regular applications of frozen pepsi bottles can do wonders to even out temps and keep them down on those temp sensitive beers.
You know, there's a fairly popular micro-brewery in my city which makes a wheat beer I love. One of the things I love is the mild hint of banana flavor to it. It's pretty subtle, not overpowering.
Temp makes all the difference. I made a hefe with the same recipe as a local MBP but kept my ferment temp about 4 deg F cooler. The MB hefe had a very pronounced banana and very little clove, but mine was more balanced (and better IMO).