Our free calculator uses recent, trusted data to estimate costs for your Split System Air Conditioner Installation project. For a basic 1 unit project in zip code 47474, the benchmark cost to Install a Split System Air Conditioner ranges between $2,218.50 - $2,891.54 per unit.To estimate costs for your project: 1. Set Project Zip Code Enter the Zip Code for the location where labor is hired and materials purchased.or a basic 1 unit project in zip code 47474, the benchmark cost to Install a Split System Air Conditioner ranges between $2,218.50 - $2,891.54 per unit. To estimate costs for your project: 1.