I was kind of bummed last month. I was looking for an Air Compressor at various stores like Sears and HD and the marketing on them is very confusing.
THey are rated as " HP 2.0 running, 6.2 peak" What does that mean?
The only way you can only evaluate them is to check the scfm at 40 and 90 psi. I saw quite a few "Huge" units with puny output; ie a 3 hp motor on a 60 gallon tank.
I ended up buying a used 220V 5 HP Sears 20 gallon unit from the 60's with some real scfm and a new GE 5 hp motor about the size of a SAAB engine for $50.00!
I'm in the process of rebuilding it and sticking it on my 30 gallon tank.