Heating and AC technology has become so advanced over the last 20 years. I really can not recognize it. I recently did a study on all the advancements of heating and AC technology, and it was amazing what I found out. Before the last 20 years, the heating and A/C industry had not advanced as fast. I found that what the advancement in technology was, is technology itself. Because this week all of us are all able to do so much more, people are coming up with more inventions all around. This goes double for the heating and A/C industry. Between 1999 and 2019, there has been more introductions of advanced heating and A/C unit than ever before. The main one 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 myself and others spoiled I can tell you. I would not ever go back to a respected 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 weekly bills alone. I take the app for the smart thermostat wherever I go. If I am on holiday 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 one of the best inventions as area of this constant rise in heating and AC technology!