California Air Tools20040C Powerful 4.0 HP Ultra Quiet and Oil-Free Air Compressor, 20 Gallon Tank, 75 dB Noise Level, White, 220v 60hz

This replaced an old 2HP compressor in my shop. This builds pressure super quick, is super quiet and is working flawlessly so far. I have it hooked up to an IR Air Dryer and I run both drain valves into pneumatic sintered silencers and into a gallon jug to catch the bleed off since I don't want to route it outside for my neighbors to hear. It's a quiet setup and works wonderful for my milling machines and blast cabinet!

Limited maintenance needed. Works well for us in small lab/workshop space. Plenty of capacity. Not as loud as traditional upright compressors. Highly suggest you get the auto drain feature. Works well to keep the moisture out of your equipment. Easy to move around if needed

This order was mishandled from the start. I ordered this compressor to have a low power/low noise air supply for LVLP finishing. The compressor arrived and would not start. After providing the serial number and QR code associated with my particular machine, the customer service representative repeatedly assured me that the compressor had been checked and was running at the warehouse. Upon closer inspection, I found a set of wires hanging out near where the start capacitors should be. They never installed the start capacitors! Not sure how they had the machine running at the warehouse without the pats required to start the compressor. The customer service rep said he had to send an entire new unit (from California, I'm East Coast). I lost a ton of money on two jobs and put out sub-par finishes that will ultimately reflect poorly on my brand.Returning the other compressor was a nightmare. It sat on a pallet taking up space in my shop for nearly 6 weeks because California Air Tools couldn't coordinate with the freight company for a pick up. I was told that it was being picked up on a Friday from 11-3. I received a phone call from the freight company during that window to schedule a pick up. As it turns out, CAT emailed the freight company 30 minutes before to schedule the pick up. Not how that works.Within a week the welds on the exterior of the machine had started to rust. The machine, after light use, has started to get noticeably louder. So very disappointing!I was told I would receive a free air hose to compensate me for the inconveniences. I never received it and when I asked when the air hose would arrive they acted like they had never offered.In Summary- Compressor arrived missing parts- Customer service lied about working status of machine- Customer service was unable to efficiently handle return/replacement logistics- Compressor started to develop rust within a week- Customer service did not make good on compensation offerThis company has a lot to figure out. I cannot endorse this product nor the way in which the customer experience was handled.

Great air compressor but piss poor shipping by Amazon. Product arrived on time but badly (yet fixable on my own) damaged. Something fell on one of the pumps collapsing the pumps angle iron mounting brackets and cutting the power cord of that pump. I couldn’t return it because I needed it to finish an arch for my wedding later that week

Takes about 2 minutes to build to full. have not used it for hours on end yet but will come back in month or so. it is extremely quiet. I purchased the model with auto drain.

I've had two of the 4-horsepower units for about 3 months. Working fine so far.I only gave them 2 stars for the reasons I've detailed below.The "ultra quiet" advertising annoys me. Yes, they are quieter than a traditional compressor. The 8-cylinder design changes the heavy "feel it in your stomach" pounding of a conventional compressor into more of a purr, which is not only quieter, but also less intrusive. But you still have to wear hearing protection. My family appreciates the lower level of sound coming from my shop, but you can't hold a conversation around these. In my opinion they don't deserve the "ultra" claim--yes they are better, but not ultra better.The manual tank drain is annoying. First, the handle on the drain valve is microscopic. You're reaching down under the tank, blind, trying to get your hands on a little piece of plastic. Second, when you activate it, the blast of air from the tank comes right by your fingers. Getting hit with that kind of air blast is dangerous. This is just poor design. I addressed this by taking a piece of wooden closet rod about a foot long and cutting a notch in the end, such that it fits easily over the little plastic handle on the drain valve. With this, I don't have to reach under the tank, and my hand is a foot away from the air/water blast.The pressure regulator knob takes a crazy number of turns to adjust. From full off to full on means twisting the knob 32 times. And there's no shutoff valve, so if you want to reduce the output to zero you have to untwist the knob 32 times, and then to get pressure back takes another 32. And then take a nap to rest your hand.On the plus side.....The packaging is outstanding. They arrive on a sturdy standard size 40" by 48" pallet. That's covered by a super-heavy cardboard box that leaves at least 6" of air space around the compressor, so even if the trucking company bashes the box, there's a chance the compressor won't be impacted. In my case, the cardboard was in great shape, and so was the compressor. Depending on where you live, of course, you may get a different trucking company.The compressor works: it compresses air. I don't know about the 10 CFM claim, but it certainly charges up the tank in short order.Bottom line: Less noisy than conventional compressors. Moves plenty of air. Is corded, so it's not permanently tethered to one place. Has a nice look to it. Not having to change the oil is a blessing. Would benefit from having a shut-off valve. Would benefit from having a different pressure regulator.

This was a great purchase. Very quiet, recovers fast. I added an extra 20 gallon air tank with no issues. I highly recommend this unit. I use it for hobby automotive and light carpentry

This compressor is more quiet than any other I’ve had with the same capacity.