What is ideal temp of air coming directly out of my oil furnace. It is new bryant furnace. Temp coming out immediately at furnace duct is 120 degrees. Currently taking 3+ hours to raise heat by 10 degrees. Air coming out of my vents much less warm than my previous furnace. Installer has assured me that furnace is correct size for my home. Any suggestions to increase heat. Thanks

Too many variables. 10 degree change is pretty substantial. A lot depends on insulation, windows, air leakage and ambient temperature. I will guess you are in the North with oil. -31 in Minnesota this morning, tremendous temp to overcome. A set point over 68* will really run up your oil bill.