HomeAdvisor’s Air Conditioning Cost Guide lists price information on installing a new A C unit, as reported by HomeAdvisor customers..What does it cost to run an air conditioner? This section is on how to calculate the cost to run an air conditioner quickly using a rule of thumb method..Air conditioner calculator form. Air Conditioning de.s. Cooling capacity * The costs shown are based on usage only and do not include service fees, .The cost to Install Air Conditioning starts at $, $, per unit, but can vary significantly with site conditions and options. Get fair costs for your SPECIFIC project requirements..