Take a look at where the air intake is for your air compressor. Find the spot where the air temperature is coolest. Move the air compressor to that spot. Cool air is easier to compress than warm air.
Section off the area where the air compressor is. Keep the area dust- and particle-free. Particulates in the air slow the movement of air through the system. Dust can build up on the working parts and clog air hoses.
Perform regular maintenance on your air compressor. Oil it as needed and drain the water from the system. Moisture will cause rust to form, reducing the efficiency of the compressor. Install a moisture separator on the air intake if humidity is a problem.
Check all the air lines and hoses for leaks. Don't have any sharp corners or bends in solid air lines. Leaking air causes the air compressor to work harder to keep up the pressure in the tank. This eventually wears out the compressor.
Use shorter air lines to help maintain efficiency. Air loses pressure as it runs through the lines. This in turn reduces the work force produced while the compressor tries to keep up.
Use the correct air filter, as per the manufacturer's specifications, on the air intake. Install a pressure differential gauge to monitor the condition of the inlet filter. There should be no more than three pounds per square inch pressure drop across a new filter. As the pressure changes, a throttling effect happens with the compressor, reducing its over all efficiency.
The ratio for running air lines is one inch drop for every ten feet of length. This method helps to let the water run back into the tank when air is not flowing through the lines. Air in the lines will end up in the tools being used, causing them to rust. Rusted tools need more pressure to run, which overworks the compressor. Oil your air tools regularly.