The average cost of having a new air conditioner installed is around $5,000, according to HomeAdvisor, as of October 2015. The cost of having an old air conditioning unit replaced can range from $1,700 to $10,000. The cost to have an air unit repaired is significantly cheaper, averaging around $300.
The cost of a new air conditioning unit varies depending on the size and type of the replacement unit. For example, installing a window unit is less costly than installing a new central air unit. The cost of repair or replacement also largely depends on the brand of the air conditioning unit and the chosen installer or repairman.