This is not always an easy question to answer but there are some factors to consider. If your system is more than 10 years old, its probably not as efficient as a newer model. Are you reaching the level of comfort that you want? There is quite a difference in the “building grade” and consumer choice in what a system can offer in terms of convenience and comfort. How many more repairs will be needed in the future? You can trust Comfort Temp Company to work with you to provide knowledge and information on replacing and/or repairing your system.