Are you thinking about upgrading your central air system with a new efficient AC unit? Are you thinking about saving some money and doing it yourself? You might want to think twice before you do it yourself. Even if you are the top handyman in town, HVAC is an entirely different world than many other types of straightforward repairs. These systems are expensive and require significant and delicate care to install them properly. Moreover, when it comes to HVAC installation, you don’t get any free second chances if you break something. Below, we have identified the critical aspects of HVAC that make it so tricky for do-it- yourself technicians.