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).
The range of caffeine content in an 8-ounce cup of instant coffee is 27 to 173 milligrams. The same amount of regular brewed coffee contains an average of  133 milligrams of caffeine, with a range of 102 to 200 milligrams. The type of coffee beans and brewing methods affect the caffeine content in coffee.