The HVAC unit is a vital addition to your house and is quite costly. As a homeowner, you will always want to have the system running efficiently so that you feel comfortable. However, you might find that the repairs to the unit can become more frequent and thus cost you a lot. In this situation, you may realize that the replacement of the Castle Hills HVAC unit might be the best option for you. The article mentions some guidelines to help you know when it is time to have the system replaced instead of doing repairs.