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Re: One or two ducts to center vent?
The only real way to upgrade your HVAC system would be to increase the size of your entire HVAC system .. including hot water coil, evap coil and compressor and also fan size and all ductiong and outlets.
Although I only have a heating system in my truck that I use every single day ,I have not had any issue as far as the ability of the stock system to heat or defrost the cab at all ,
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