Oversized AC in existing ductwork
Normally, I would do much more research before making a large purchase instead I got taken by a salesman. I had my existing 2.5 ton ac and furnace removed and replaced with a 5 ton seer 16 with a two stage variable speed air handler in a two story 2100 square foot home. They did not replace my existing ductwork but they did seal them up to a 99% HERS rating (new construction). The AC does not short cycle and in my climate zone we have very low humidity; however, there is a problem. I hired a BPI energy auditor to do an energy model for more energy upgrades to my home. The auditor told me that if they didnt not do a manual J and did not change the duct work the static pressure could be massive in the existing duct work. My returns were enlarged to handle the new ac unit. My understanding is that massive static pressure could cause severe pressure. My auditor wonÂt be able to do the test until this Saturday, but if we find out that my existing duct work canÂt handle the new system do I have any recourse with the contractor. Does anyone know what I should or could do?