Systems & Energy Conservation
The introduction of new heating, ventilation and air conditioning systems into historic buildings should be handled carefully so that it has the least possible impact. If new ducting is necessary, a good preservation approach is to keep it as an exposed element within the space, or within a minimal soffit along the wall. New elements such as baseboard heating systems should be carefully installed without altering historic woodwork or other materials. Through-the-wall HVAC units are usually not appropriate, because they involve demolition and could be highly visible on the exterior.