Rob, I start seeds in January also and grow in my garage, trying to maintain cold treatment temperatures of 50-55 degrees F. Experimenting, I found temperatures at the highest part of the garage are much warmer than down low. I conveniently have a storage loft in my garage lit by flourescent lights and can grow under the lights... on the coldest nights, the temp. stays above 50....maybe you have something similar, such as a high shelf?
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