About: http://webisa.webdatacommons.org/283820878

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The OP needs to consider that other factors are in the price of bid to upgrade his system such as duct revisions, zoning, new stats and I am assuming sealing and insulating the duct as well.
http://www.w3.org/ns/prov#wasQuotedFrom	hvac-talk.com