While dependent on the outside temperature,  you should see 20°F-40°F reduction from the ambient temperature to the air emitting out of the vents. Fresair is not a traditional air conditioner, there are no coolants or compressors, which would kill the batteries. Fresair is a green product powered by a 12V power source, normally just the regular vehicle’s existing battery or batteries, drawing minimal power whilst cooling the air with tap water and pine using evaporation.