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).
How much caffeine is in coffee? Coffee can contain anywhere from 60 to 120 mg per 8-ounce serving, depending on how it is brewed. Teas contain far less, averaging 20 to 90 mg per 8-ounce cup, as do soft drinks, which pack around 20 to 40 mg per can. Even chocolate contains a small amount of caffeine, about 6 mg per ounce.