If you are an HVAC technician, then you have decided to become certified and employed in the one field that I cannot ever see an end to. Sure, there may come a day when regular vehicles are swapped for hovering and flying vehicles. There may come a time when regular computers and such are archaic and no longer updateable. However, I can never see a time when people will no longer use air conditioners and furnaces. HVAC units have completely changed our world in the last 100 years, and I don’t think that it will go anywhere anytime soon. For thousands of years, people were forced to use fire as their main source of heat, and those heating systems would cause fires and all sorts of other problems. However, when the furnace was developed nearly 120 years ago, it changed everything. Now, we could have a heating system in our house that we could use 24/7 with very little supervision. Just a couple of years later, the air conditioner was developed that would keep everyone cool during the summer. Oddly enough, the design and function of the furnace and the air conditioner have not drastically changed since then. Sure, they look different and come in smaller packaging, but the HVAC unit has not developed much differently. That is because HVAC units work in the same way and do the same basic thing. I think that as long as there are humans and electricity, we will always have HVAC units. If you are an HVAC technician, then you will never have to worry about being replaced.