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.
Primary lung tumors account for 50% of all metastatic brain tumors. Lung cancer is the most common origin of metastatic disease. Of lung cancer patients who survive for more than 2 years, 80% will have brain metastases.esticular tumor is a uncommon cancer and yet it more frequently metastasizes to the brain as compared with lung cancer. Patients with brain metastasis at the same time of having systemic cancer (synchronous metastasis) tend to do worse as compared with patients with metachronous metastatic disease.