Size a rental compressor by adding up the air its tools drink. A 90 lb pneumatic breaker asks for roughly 90 cubic feet a minute at 90 psi, so two of them plus hose losses put you past a 185 cfm towable and onto the next machine in the fleet. A 185 rents for about $110 to $160 a day, and the step above it costs closer to double.
Add the tools together, then add the hose
Every air tool has a consumption figure and they stack. Two breakers, a chipping hammer and a blow gun on one manifold want the total, not the largest. Long runs of hose lose pressure along the way, and a small bore whip at the end of a hundred feet will starve a tool that the machine could otherwise feed comfortably.
Pressure is the constant, volume is what you buy
Almost every towable rental is set to deliver around 100 to 125 psi, so the number that separates one machine from the next is the volume it can hold that pressure at. Asking for more psi rarely helps a tool designed at 90. Asking for more cfm is what stops the machine dropping off and the breaker slowing down mid shift.
What the yard hands you beyond the machine
Hose, whips, oilers, claw fittings and safety cables are usually separate lines, and the tools are hired individually as well. Say what you are running and how far from the machine you will be standing, so the counter sends bore sizes that match. A mismatched fitting on a Friday afternoon costs more than the hose ever would.
Compressed air is not a broom
Using the hose to blow dust off clothing or a slab is the most common misuse on a site, and federal rules on hand and portable powered tools cap air used for cleaning at 30 psi with effective chip guarding and protective equipment. Ask the counter for a regulated blow gun rather than an open line if cleaning is part of the work.
Questions people ask about air compressor for rent
What size compressor do I need for a jackhammer?
One 90 lb class breaker is comfortable on a 185 cfm machine, which is the smallest towable most yards stock. Two of them on the same machine will run but will feel slow once hose losses are counted, so a 375 is the honest answer for a two breaker crew.
Can I run air tools from a small electric compressor?
Only the small ones. A brad nailer or a tire inflator is fine on a portable tank unit. A breaker, a rock drill or a sandblast pot needs continuous volume that a tank compressor cannot sustain, and the tank simply empties faster than it refills.
Is fuel included on a towable diesel compressor?
It goes out full and comes back charged for whatever it burned, at the branch rate. On a week long hire you will be refuelling it yourself on site, so ask the tank capacity and plan a fuel can or a delivery rather than dragging the machine back to a station.