We keep our house cold in the winter (65) and that isn't ideal for bread rising, so I stuck my dough in the oven for several hours with only the oven light turned on. The incandescent bulb warmed up the oven nicely, but not too hot. I turned the light off before I went to bed so it wouldn't overdo it.
Here's a before and after of the rising in the oven with just the oven light..
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