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 12-ounce cup of coffee that you brew at home contains about 100 to 160 milligrams of caffeine. Use a coffee maker with coffee pods and you're likely to get between 75 and 150 milligrams per cup. Instant coffee contains between 135 and 148 milligrams per cup. Purchase that cup at a coffeehouse and you'll get between 178 and 260 milligrams in a 12-ounce serving. A shot of espresso contains about 150 milligrams of caffeine. Any specialty drink, such as a mocha or latte, made with a single shot will thus also contain 150 milligrams. Frozen coffee drinks also contain significant amounts of caffeine -- between 140 and 260 milligrams per serving.