###Human: The cost of Joe's new HVAC system is $20,000.  It includes 2 conditioning zones, each with 5 vents.  In dollars, what is the cost of the system per vent?, ### Assistant: Two zones with 5 vents per zone is 2*5=10 vents.
Thus, the $20,000 system costs $20,000/10 = $2,000 per vent. 
 So the answer is :  2,000