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.
Lung cancer types. There are two main types of lung cancer: small cell lung cancer (SCLC) and non-small lung cancer (NSCLC). Non-small cell and small cell lung cancers are classified according to cell size and type.NSCLC accounts for nearly nine out of every 10 cases.mall cell lung cancer. Small cell lung cancer, which is often referred to as oat cell lung cancer because the cells resemble oats under the microscope, begins in the lung tissue. Unlike most non-small cell lung cancer, it often spreads quickly.