Yet another duct system that failed to pressure test! A very fine ~ 50 year old home in Knoxville is another example of the deplorable condition of our HVAC systems. This home fortunately has most of the ducts inside the conditioned space. Even so, the duct runs that were in the crawl-space were not particularly well insulated and leaking energy into the atmosphere. There is consistency in the occurrence of poorly designed and installed HVAC systems in these older homes. I guess the issue is that they were never designed for central heat and air to begin with. Some systems are just worn out, many troubles are the result of compromise during installation. In any case there is a lot of work to be done to bring these homes up to current standards. I am thinking that the national energy loss through duct systems is far over the claimed 15%.
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