Seeing the warnings when your central heating and a/c idea is on its way out is a tricky thing.
If you know what to look for, you will notice them and be able to act accordingly, however periodically you can even extend the life of your central heating and a/c idea component if you can call your local heating and cooling specialist when you start to see these signs. Periodically a general heat and cooling system tune up and check up can repair the issue and make your central heating and cooling component last some weeks to a year longer than it would if you did not catch it in time. This was the case with our central heating and a/c. I seen the signs of it starting to go out when it took long to shut off and start up. Also when it was making loud noises while running. I called the local heating and a/c company instantly and had them send out a certified heating and a/c specialist to have a look at our Heating as well as A/C unit, then once they did they were able to do a few things to extend its life! My central heating and cooling idea ended up lasting an extra 8 weeks before I had to invest in a brand new and current central heat and cooling system unit. This gave myself and others time to get the investment together to be able to purchase the new heating and a/c. I was so blissful that I seen the signs to be able to buy myself some time.