My house is right around two hundred year old, and when my spouse and I purchased it, everything was extremely outdated. The house had not been well cared for, and we addressed rotting wood, crumbling plaster, and water damage and mold. The plumbing was corroded and leaking. The electric lines were a fire hazard and there was only one power outlet per room. Most of the home’s windows were painted shut, and each of them leaked a tremendous amount of air. One of the worst problems with the house was the HVAC system. The furnace and air conditioner were ancient and had never been professionally serviced. There was visible dust and debris clogging the vents, the furnace was rusty and corroded, and the air conditioner demonstrated signs of mold and mildew. We were reluctant to run the furnace because of the potential for carbon monoxide poisoning. We were just as concerned about operating the air conditioner due to the threat to indoor air quality. Some of the water damage in the house seemed to have been as a result of the cooling system. We hired a neighborhood HVAC contractor to inspect this furnace, air conditioner, and duct system and submit an estimate to fix everything. We were hoping to avoid purchasing and installing a totally new HVAC system. Fortunately, the duct system can be salvaged with sealing and cleansing, but the air conditioner and furnace were beyond help. They were both so outdated and inefficient that they would cost a fortune to operate. So we are will be saving money by upgrading to modern units that will cost far less to run.