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. 3  Metastasis (M) refers to whether cancer has spread to other parts of the body, usually the liver, bones or brain.tages of non-small cell lung cancer: 1  Stage I non-small cell lung cancer: Cancer may be present in the underlying lung tissues, but the lymph nodes remain unaffected.