Have you heard of the Rocket Mass Heater?
It is a very efficient wood heater where, in summary, the smoke from the sticks burned becomes the fuel in an afterburner, creating extreme heat. By installing the horizontal chimney in the floor of the hydroponic beds it would heat the water in colder climates. The water holds and slowly releases the heat over a long period of time, such that the effect from one fire in the evening could provide heat all night long. In the morning, passive solar boxes with black water hoses could maintain the waters temperature. On the top of the afterburner drum a canning pot could be modified into a steam engine., or if one had the funds, could purchase thermoelectric power generators that could help charge batteries or run fans.