The first reason is not to try repairing your system for yourself. The complete HVAC system consists of many electrical components. Also, different gases emit through fuel combustion, among which few are deadly gases. Any electrical component can give you shock because the voltage on which these systems work is high. Every single part of your HVAC demands professional care, not just care. For the safety of your own, do not try performing anything untrained.
To repair any HVAC system, you don’t just need proper training, but the experience is also essential. Over the hours of training, these skills polish then tested on dummy sets. There are special tools for repairing certain parts and not using accurate tools to damage them, leading to eventually breaking down the system. Electrical, chemical, and plumbing skills are required to repair an HVAC system. A proper safety kit has eye protection, hand protection, and skin protection gears.
No one wishes for monetary loss; if you try to open your HVAC system by yourself, then you’re putting an end to your warranty. In an annual or half-yearly maintenance check, the professional will work under warranty (only if it’s valid or you have one). When you perform your HVAC system’s repairs, you lose the warranty you could have used for more significant repair. If the system breaks down by the professional, you’re not liable to pay for the loss, whereas this plus point is null and void if you temper the HVAC system yourself. It can harm your pocket.