Mechanical systems are the various major systems throughout a home, such as the plumbing, electrical and heating/cooling systems. These systems can be costly repairs, and it is vitally important that buyers access the condition of the mechanical systems before they agree to purchase a home. Buyers typically hire an inspector to perform a thorough inspection of the home after they have placed an offer on a home. The inspection includes an evaluation of the home's structure as well as a basic analysis of the mechanical systems. For a thorough evaluation of the mechanical systems, one should hire a plumber, electrician or other professional help. An expert is better able to provide buyers with the details that they need to make a decision whether to by the home. Mechanical systems can last for many years, but they occasionally need to be upgraded or repaired.