furnace highest rating is 97 % efficient for a residential model. This is known as a condensing furnace.
Lennox top o the line furnace is 98.2 percent efficient
53533
The best cost efficient furnace would be an Energy Star furnace. They are efficient in operation and provide an estimated 21% savings as opposed to other furnaces.
The furnace damper should be open in winter to ensure efficient heating.
40 percent out of 500 percent = 0.4 x 500 percent = 20 percent
100 percent of 500 = 500
82 percent of 500 = 0.82*500 = 410.
about 500 people
10 percent of 500 = 5010% of 500= 0.10 * 500= 50
75% of 500= 75% * 500= 0.75 * 500= 375
2.9% of 500 = 2.9% * 500 = 0.029 * 500 = 14.5
34.2 percent of 500 is 171. 171/500 = 0.342