Modern furnaces are much more difficult than merely burning gas and air. To operate correctly, your furnace regulates the environment-fuel mixture. Gas and lp were once cheap types of heating, but because they be popular individuals days are ending. Because the prices for fuel increases, the efficiency of the burn gets to be more important. Gas is really a light fuel which should burn blue. A yellow flame inside a gas furnace most likely means that it's not receiving enough air. A Denver furnace repairman will be able to adjust the air flow to repair a yellow flame easily. Other...