The cost of installation of a new Home Comfort System will depend on many factors.  The size of the system needed for your home, the capacity/ power of the system, efficiency, modification of ductwork if needed, electrical costs, and also thermostats all factor in.  Other things that will determine the price are the quality of the system that you are putting in and any rebates offered through your power/ natural gas provider or the manufacturer.  The best way to determine precisely how much it will cost to replace your system is to contact Mills Heating & Air and have someone come out for a free estimate.  They will determine the best equipment for your home and also give you options to choose from that will meet your budgetary needs.