The cost to install a window air conditioner averages between $ and $, depending on the size you need. Installing a window air conditioning unit can bring added comfort for a reasonable price, but it will be less powerful than a central air conditioning system..We divided new HVAC installation cost into three groups first, the Change Out, which is an installation of just your HVAC components without the ductwork Full Installation, which is the installation of all HVAC equipment including ductwork and finally, Full Installation with Features, which is a full installation with additional features such as a zoning system or media filter with a complimentary Ferrari Portofino..A new furnace in a central heating system costs $, to $, or more. If you don’t need ductwork, the cost of a new heating and cooling system can be significantly decreased. In cases where new HVAC duct is required, however, you might pay $, to $,..You will gain a greater understanding of how these systems work, along with the total HVAC system cost, based on the latest estimates from quality providers. Heating, Ventilation and Cooling Prices It would be impossible to provide you with an exact figure for a total HVAC system cost..