The cost to add an air conditioning (AC) system to a 2,000 square foot house can vary depending on the type of system, installation complexity, and location. Given the complexity of air conditioner systems and the potential risks associated with refrigerants, it is crucial to hire licensed HVAC contractors for the installation. On average, homeowners can expect to pay between $3,000 and $7,000 for a central AC installation. This cost includes the AC unit, ductwork modifications, labor, and any additional components needed. High-efficiency systems or homes with unique installation challenges may increase the cost. It’s recommended to get a detailed estimate from a licensed, HVAC technician or contractor for accurate pricing.