This is a difficult question to answer without knowing the specific repairs that need to be made. Generally speaking, repairs can range in cost from a few hundred dollars to several thousand dollars. The best way to get an accurate estimate is to have a professional come to your home and assess the repairs that need to be made.
It's important to service your equipment before it breaks down because it can be very expensive to repair. Often, the cost of repairs can exceed the cost of replacement. In addition, equipment that hasn't been serviced can pose a safety hazard. When choosing a repair company, be sure to select one that is experienced and has a good reputation.