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.
NonSmall-Cell Lung Cancer Symptoms. The symptoms of lung cancer are caused by the primary tumor or by metastatic disease. The primary tumor may press on, invade, or damage surrounding tissues, blood vessels, or nerves. Metastatic lung cancer may cause similar problems in other parts of the body. As many as 10% of people with lung cancer have no symptoms.