California Air Tools’ Ultra Quiet series is designed to combat the stereotype of noisy compressors. The company’s model 4620A operates at a mere 70db when filling, which the manufacturer claims is 30% lower than comparable models. The 2-hp 4.6-gallon compressor has a dual-piston pump system, so the tanks fill more quickly and the motor runs for a shorter period of time. It produces 5.3 cfm at 90 psi. Aluminum tanks eliminate problems with rust and reduce the weight of the tool to a manageable 64 pounds. Since the unit is oil-free, it can be placed on sloped roofs and used in the cold. ¦ Price: $369. 619-407-7905. californiaairtools.com.