I have had the same Heating, Ventilation, plus A/C unit for the last 16 years. It was top of the line Heating, Ventilation, plus A/C technology when I bought it. And, it still is harshly efficient. But, the aspect I am most thrilled with is the reliability quotient of my hearty Heating, Ventilation, plus A/C unit. This heating plus cooling unit has been through some incredibly warm summers plus more than a few chilly snaps. Never has my Heating, Ventilation, plus A/C unit failed us. A massive reason for the Heating, Ventilation, plus A/C units longevity is the excellent maintenance it has received. From the day the heating plus cooling unit was installed, I have paid attention to being proactive with its care. I immediately enrolled in a semi annual maintenance program after it was installed. Our Heating, Ventilation, plus A/C guy has come out twice a year, every year since. He spends numerous thirds inspecting the inner really workings of the condenser plus the air handler. The Heating, Ventilation, plus A/C tech lubricates important parts while checking for worn components which need to be replaced. I guess this preventive care has been a big factor keeping the Heating, Ventilation, plus A/C with a perfect operating record. I suppose I have had something to do with it too. My Heating, Ventilation, plus A/C pro told me long ago how I could do my part in preserving the heating plus cooling system. I regularly change the air filter every week. I’m sure to cruise through the home regularly checking to be sure all vents are open. Obstructions can also be a complication so, I look to be sure no vents or returns are covered up. I figure if I do my part to keep the Heating, Ventilation, plus A/C running well then, I’m only helping my own cause.