Nice size home. 
Price I was quoted was for a 2.5 ton AC and 75k btu furnace.
Not sure how they are selling for so low. Equip price from the
distributor for an brand name i.e. Armstrong for a 16 seer, 90% +, two stage AH+furnace is going to cost the HVAC contractor in the 2.5k range (Approx 300 for the coil, 1200 for the condenser, 900 for the furnace, 350 for line-sets and expansion valve) and that doesn't include the labor.