An AC repair is typically costly; occasionally, it may even be more expensive than a complete replacement. If your unit is very new, say less than five years old, and the repair is affordable, then it makes sense to fix up the unit. However, as your unit approaches 10-15 years finding new parts for the unit can be more difficult. Even if the price is not in the thousands, you should think about how frequently you spend money on the appliance's repairs because it adds up over time.