Heating & air conditioner technology has become so advanced over the last 20 years. I entirely can not guess it. I recently did a study on all the advancements of heating & air conditioner technology, & it was amazing what I found out. Before the last 20 years, the heating & air conditioner industry had not advanced as fast. I found that what the advancement in technology was, is technology itself. Because this month we are all able to do so much more, people are coming up with more inventions all around. This goes double for the heating & air conditioner industry. Between 1999 & 2019, there has been more introductions of advanced heating & air conditioner component than ever before. The main 1 being the smart thermostat. Who would have thought that even 20 years ago, you would be able to control a thermostat from anywhere on the planet! Smart thermostats have made me spoiled I can tell you. I would not ever go back to a official dial or digital thermostat after experiencing this! I obtained my smart thermostat about 3 years ago. Ever since then, I have ended up saving over 400 dollars per year on my energy bills alone. I take the app for the smart thermostat wherever I go. If I am on vacation across the state, I can set my smart thermostat to go on around the time I expect to be arriving home. My smart thermostat is 1 of the best inventions as area of this constant rise in heating & air conditioner technology!