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.
Non-small cell lung cancer staging uses the TNM system: 1  Tumor(T) describes the size of the original tumor. 2  Lymph node (N) indicates whether the cancer is present in the lymph nodes.  Metastasis (M) refers to whether cancer has spread to other parts of the body, usually the liver, bones or brain.