To be sure, let a Roseville heating and air conditioning contractor like C & C Heating & Air Conditioning check. Many HVAC experts advocate the use of furnaces with high annual fuel utilization efficiency (AFUE) ratings. Some of the best gas furnaces on the market have AFUE grades in the mid- to high 90s. You need to have your furnace’s AFUE grade checked against the Energy Department’s minimum standards.
Second, in determining the return on investment (ROI) of installing a new furnace, look at your utility bills last winter. Trethewey suggests you add those amounts, multiply the sum by 20%, then divide the cost of a new furnace by this figure, and you will know the number of years it will take to recover the investment. ROI also depends on fuel price and home size.