Two compressors that we have successfully used:
California Air Tools 2010a.
- $174 on AmazonPrime.
- Very quiet indeed.
- Powerful 1.0 HP (Rated / Running) 2.0 HP (Peak) Motor.
- 2.20 CFM @ 90 PSI
- Not feasible to power with a 2000w generator for those building off-grid
Porter-Cable C2002 150 PSI, 6 Gal. Oil-Free Pancake Compressor
- $99 at Home Depot
- .8 HP motor
- 2.6 SCFM@90psi
I edited this post because it was recommending the California Air Tools 1P1060S. However, that unit is only rated at 1.5 CFM @ 90PSI and we have not used it to make Aircrete (although we have it around the shop for misc little tasks).