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.
cancer that metastasizes spreads to the bones from other parts of the body such as the breast lung or prostate is called metastatic cancer and is named for the organ or tissue in which it began primary bone cancer is far less common than cancer that spreads to the bonesot all bone tumors are malignant in fact benign noncancerous bone tumors are more common than malignant ones both malignant and benign bone tumors may grow and compress healthy bone tissue but benign tumors do not spread do not destroy bone tissue and are rarely a threat to life