Hello.... I'm a relatively new kit maker as well. I had a similar issue, and have decided to ferment on my main level and then age in the basement.
However, in my search for ways to keep the primary fermenter at a steady temp I did uncover a few fun ideas. One was to place it in a large tub, filled with water, with an aquarium heater inside the tub! I thought that was over-kill, but genius, as you could set the heater to the desired temp and it would heat the water and the liquid in the bucket to the set temp. Another was to place it in a small room and turn up the heat (an obvious suggestion)... which I would do in our downstairs half-bath, but realized there is no radiator there... and hubby understandably does not want me plugging in any electric heaters for such periods of time. A third was to build a large wooden box and affix a high wattage bulb in the top, then place it over the bucket, but this could heat it up TOO much, and again I would worry about it being a hazard.
Anyhow, good luck!