Five HP and 15 gallon tank will definitely NOT run a DA, a die grinder, a high-speed sander or a cut-off tool. Anyone telling you that is just trying to sell a compressor. Trust me, I've had two 5HP compressors, and neither would run much more than an air ratchet or an impact wrench. They barely would run a decent HVLP paint gun.

That size compressor will be lucky to put out more than 4.0 CFM at 90PSI. DA's and other similar tools take 6-9 CFM. Some HVLP guns take 10 CFM. My 5hp compressor was lucky to run a DA for more than a few minutes.

I bought a 7hp, 60 gal dual piston unit. Costs more, but at least it works.