Most people only use one compressor and the air in the chamber gets really muggy and warm. Having a good hyperbaric experience usually involves a dryer, cooler air. The more air flow going into the hyperbaric chamber the less heat and humidity. But, some air compressors give off warmer air when pumping more air to the chamber.
Syncing 2 motors in serial takes the most strain offer the motor and makes the motors work more efficiently. This gives of less heat and makes less noise than one larger compressor. The bigger the motor the more heat generated. I like to sync 80's and 120's instead of having one large 200 size motor.
Note: higher psi compressors will make more heat, especially if trying to keep a 1.4 or 1.5 ATA chamber inflated.
PARALLEL VS SERIAL
In serial, two 80 or 120 compressors will force a higher pressure into the hyperbaric chamber when people want a higher pressure. There is less back pressure when 2 motors are working in serial. If the release valves are only set to 1.3 ATA, then it will just pump more air flow and the pressure will never go over 1.3 ATA.
Parallel is different. When in serial no matter how many compressors you have synced one behind the other, it will still only pump out 80 litters of air. But if the same compressors are synced in parallel, then 160 liters will come out.
When in serial the first motor pressurizes the air and feeds the condensed air into the 2nd compressor so when taking in condensed air it helps with the back pressure as the chamber nears 4 psi.
Note: WARRANTIES WILL BE VOIDED IF USING AN AFTER MARKET COMPRESSOR. IF THERE IS A LEAK OR ZIPPER FAILURE AND YOU DIDN'T USE THEIR COMPRESSOR APPROVED BY THE MANUFACTURER IT CAN BE A PROBLEM.
I ONLY PROMOTE COMPRESSORS THAT I DON'T HAVE TO OIL. The type that all manufacturer's I know of offer with the chamber are the OIL-less type. No one wants the type you have to oil anymore. The oil type were a little quieter but they had heavy maintenance. Now the oilless type have improved due to technology that they are nearly as silent as the oil type.
Back in the day people had to oil their compressors to rid the friction.
If people want really high end compressors they can cost a lot and they are insulated and have very low humming noise. If you want a better air compressor that comes factory stock make sure you ask at the time of purchase so you don't buy the factory stock one and have to buy a new one later on.
Normally, the compressor is purchased seperately from the chamber itself. Many people these days want more air flow to keep it cooler and less humid in their and others live in colder places and want less noise but less air flow. Many people get aftermarket compressors that are built really high end. Note: I do not sell any compressors that need to be oiled. The chambers on this website, none of the chambers on this site need to be oiled.
I prefer smaller air compressors in sync than a really large one. There are pros and cons to each (loudness, electricity usage, heat generated that heats up the air, etc.)