* Type of system: A completely new, modern AC system will be far more expensive than trying to retrofit a used, older system. A modern system might involve new compressor, condenser, evaporator, lines, and controls. A used system might be cheaper upfront but could potentially have hidden problems.
* Parts cost: Prices for new AC components fluctuate with market conditions and the vendor. Sourcing parts from a classic car specialist will likely be more expensive than finding generic parts at a regular auto parts store. Using recycled/remanufactured parts can save money but carries more risk.
* Labor cost: This is a substantial part of the overall cost. The complexity of installing an AC system in a classic car is much higher than in a modern vehicle. Finding a mechanic experienced with classic car AC is crucial; their labor rate will be higher than a general mechanic. The amount of time spent on installation directly impacts the labor cost.
* Condition of the vehicle: If the car already has some existing AC components (even if non-functional), that could reduce costs slightly. However, if extensive repairs to the dashboard, firewall, or other areas are needed to accommodate the new system, the cost goes up.
* Location: Labor rates for automotive repair vary greatly by geographic location.
Rough Estimates:
Without knowing specific details, it's impossible to give a precise cost. However, a reasonable estimate for a complete new AC system installation in a 1976 Chevy Nova might range from $2,500 to $6,000 or even more in some cases. This is a wide range because of the variables listed above. A retrofit with used parts might bring the lower end closer to $1500-$2000, but this comes with significant risk.
It's strongly recommended to get multiple quotes from reputable mechanics specializing in classic car air conditioning before making a decision. Be sure to clearly detail what you want (new vs. used parts, complete system vs. repair of an existing one) when getting your quotes.