I recently had my central heating and a/c plan unit tuned up and checked up by the local heating and a/c business, but the certified heat and a/c specialist that they sent out was really helpful and knew what he was doing. He looked over my entire central heating and a/c plan and found that there was nothing wrong with it at all, but it was actually actually working better than other central heating and cooling units they had done check ups and tune ups on the same day. I was so glad to hear this! I had worried that maybe my central heating and a/c plan unit was going to need some drastic work because I had not had an Heating and Air Conditioning tune up or check up from the local heating and a/c supplier in well over an entire year. It goes to show that I take good care of my central heat and a/c unit on my own and the fact that I have a top heating and cooling brand helps as well. When you have quality Heating and Air Conditioning systems, this helps in the long lasting lifespan of your central heating and a/c plan unit, at least that is what the certified heat and a/c specialist had told me while he was doing my heating and cooling tune up and check up. That information was useful and I am keeping that in mind in the event I ever need to get a brand new and updated central heating and a/c plan unit.