I currently have a single 444c viair compressor hooked up to a 5 gallon tank.
I’ve thought about changing to dual compressors but my question is, can I run 2 different compressors?
Looking at a constant duty and a fast fill.
Or is there a better option?
As long as you will no be running the pumps for long extended periods of time, adding a fast fill compressor to a 5 gallon system will not cause any issues. They can each handle the 5 gallon by themselves, so with both they will filling the tank quick enough that it wont cause any issues. Just make sure you are using the right gauge wire for both especially the fast fill as it will likely pull more power.