The average cost to repair a residential AC system is $250 in the United States. Depending on the type of repair, homeowners generally spend between $150 and $450, according to HomeAdvisor. This information is based on repair costs that range between $100 and $1,000 reported by HomeAdvisor members.
When an AC system requires repair, there are several telltale signs. Listening to the AC system is the best way to determine whether the system needs repair. Loud sounds such as clunking and whistling indicate a repair is required. Another sign the system needs repair occurs when the unit fails to cool the home as effectively and efficiently as it used to.