The recent debate concerning the problems of ecology has focused our attention upon the relationship between man and his physical surroundings. For the most part, historians have been interested in such questions tangentially. ignoring the basic issue of the effect of the environment upon people. The rising interest in the history of technology is based on the realization that political and military events, the history of ideas, and changing social patterns take place within the physical world. The effects of the environment can hardly be ignored if one is to understand fully historic change. One problem which illustrates the interrelationship between human and natural spheres in history is the development and use of the chimney and fireplace in medieval England. Hitherto it has not been fully realized how the new heating technology affected the spectrum of society, and changed the mores of medieval life.
Early medieval buildings heated by a central hearth required a high ceiling to prevent sparks from causing fires. Thus, whatever warming might come by sitting around the fire in a circle was partly offset by the upward dissipation of heat into the large, high-ceilinged room. Moreover, when such rooms had louvers at their peaks to vent smoke, they also let the heat escape — a waste of fuel, as well. With adoption of the fireplace and chimney in many homes of the twelfth century, the number of persons sitting next to the fire was reduced by nearly three quarters, thus diluting the functional capability of large rooms. The chimney fostered the small room. Though heat loss still occurred through the chimney, it was much less than the loss from the open hearth. Moreover, with a chimney the danger of fire from sparks lessened. Rooms could be built smaller and with much lower ceilings, heating the area more evenly. When precautions were taken to exclude draughts, a smaller room heated by a fireplace warmed fewer people but with a better heat distribution than the larger hall with a central hearth, where most of the heat rose toward the high ceiling, and of course, no person benefited from it.