Noisy equipment, excessive humidity within the home and a unit older than 10 years are among the top reasons to replace your central air conditioning, according to Energy Star, a U.S. government program promoting energy efficiency.ost central air conditioning units come with two-to five-year warranties. Extended warranties can be purchased for an additional price -- usually for several hundred dollars -- and the longer the warranty, the higher the price.
The following are prognostic factors for advanced and metastatic nonâsmall cell lung cancer: 1  number of metastatic sites People with a single metastatic site have a more favourable prognosis than people who have cancer spread to several different sites.
The most common type of lung cancer is called non-small cell lung cancer, where unusual growth takes place inside your lungs. As more cancer cells grow they can form into a tumor and, as the disease advances, it may spread to other parts of your body. This is called metastatic non-small cell lung cancer.