The average gas furnace with a 90% AFUE (thatâs the rating that determines just how energy-efficient your furnace is) will cost you about $2,500 (and, of course, that doesnât include installation costs. Count on spending about $2,000 to have your new furnace installed). If you opt for a multi-stage gas furnace, youâll get even more energy efficiency, but youâll also wind up spending hundreds of dollars more on it! Compare that to the average oil furnace â which will cost you about $2,000.
Caffeine is classified by the Food and Drug Administration as  generally recognized as safe  (GRAS). Toxic doses, over 10 grams per day for an adult, are much higher than typical dose of under 500 milligrams per day. A cup of coffee contains 80â175 mg of caffeine, depending on what bean (seed) is used and how it is prepared (e.g. drip, percolation, or espresso).
A 6-ounce cup of regular coffee contains between 75-150 milligrams of caffeine, according to Johns Hopkins researchers. Instant coffee has less, an average of about 70 milligrams, while an espresso contains about 40 milligrams. Six ounces of brewed tea has about 30 to 90 milligrams of caffeine. A 12-ounce cola may have 30 to 60 milligrams. An 8.4-ounce can of Red Bull Energy Drink boasts 80 milligrams.