Heating and air conditioning technology has become so advanced over the last 20 years. I genuinely can not guess it. I recently did a study on all the advancements of heating, ventilation in addition to A/C technology, and it was amazing what I found out. Before the last 20 years, the heating, ventilation in addition to A/C industry had not advanced as fast. I found that what the advancement in technology was, is technology itself. Because today every one 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, ventilation in addition to A/C industry. Between 1999 and 2019, there has been more introductions of advanced heating, ventilation in addition to A/C equipment than ever before. The main one being the smart temperature control. Who would have thought that even 20 years ago, you would be able to control a temperature control from anywhere on the planet! Smart temperature controls have made me spoiled I can tell you. I would not ever go back to a correct dial or digital temperature control after experiencing this! I bought our smart temperature control about 3 years ago. Ever since then, I have ended up saving over 400 dollars per year on our energy bills alone. I take the app for the smart temperature control wherever I go. If I am on trip across the state, I can set our smart temperature control to go on around the time I expect to be arriving home. My smart temperature control is one of the best inventions as part of this constant rise in heating, ventilation in addition to A/C technology!