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.
Metastatic cancer has the same name and the same type of cancer cells as the original, or primary, cancer. For example, breast cancer that spreads to and forms a metastatic tumor in the lung is metastatic breast cancer, not lung cancer. Under a microscope, metastatic cancer cells generally look the same as cells of the original cancer.