Duffy Ducts 325 N Adams St Carthage, IL 62321, United States 309-221-1823 http://www.duffyducts.com [email protected] For reliable HVAC services in Carthage, IL, choose Duffy Ducts. Founded by air conditioning and furnace repair masterFloyd Duffy, this company has the expertise necessary to maintain, fix, or replace any heating and cooling equipment. Whether you need routine maintenance or more intensive cooling and heating work, Duffy Ducts provides exceptional service at every level. Their residential HVAC service... read full review »