For many landscaping and irrigation contractors across North America, the arrival of fall brings one of the busiest and most time-sensitive jobs of the year: sprinkler and irrigation system winterization.
Water left inside irrigation pipes, valves, sprinkler heads, pumps and other components can freeze when temperatures fall. As that water freezes and expands, it can damage irrigation infrastructure and create costly repairs when the system is restarted in the spring.
For professional landscapers completing multiple sprinkler blowouts every day, however, winterization is also a productivity challenge. Crews need enough compressed air to remove water effectively without applying excessive pressure that could damage the irrigation system.
The air compressor used for the job can have a significant impact on how efficiently a landscaping business moves from property to property during its fall winterization season.
Irrigation winterization is preventive maintenance intended to reduce the risk of freeze-related damage.
The Irrigation Association identifies winterization, along with spring startup and controller programming, as part of the regular maintenance work performed by irrigation contractors.
Winterization becomes particularly important in regions where sustained freezing temperatures occur. Water can remain trapped in irrigation lines, valves, pumps, sprinkler heads and backflow-related components after irrigation has stopped for the season.
A November 2025 article from Landscape Management highlights the importance of paying attention not only to irrigation lines but also pumps, valves and other components that can retain water. Industry experts interviewed by the publication emphasized that trapped water could cause significant damage when it freezes. One widely used professional winterization technique is the compressed-air blowout method.
During a sprinkler blowout, the irrigation water supply is shut off and compressed air is introduced into the system at an appropriate connection point. Individual irrigation zones are then activated sequentially so that compressed air pushes water through the piping and out through the sprinkler heads.
The objective is not to pressurize the irrigation system as much as possible. It is to move sufficient air volume through the irrigation lines at an appropriate air pressure to evacuate the water.
Landscape Management's irrigation experts emphasized this point in its winterization coverage. Matt Bruns of Toro explained that contractors should prioritize air volume rather than simply increasing pressure because the objective is to push water out of the irrigation system.
For landscapers, that means understanding two air compressor specifications:
CFM: Cubic feet per minute measures the volume of air an air compressor delivers.
PSI: Pounds per square inch measures air pressure.
Conversely, simply increasing pressure to compensate for insufficient airflow can increase the risk of damaging sprinkler components. For irrigation blowouts, landscapers generally want adequate CFM at controlled pressure.
Colorado State University Extension's guidance on preparing sprinkler systems for winter emphasizes that air volume is as important as air pressure. Its guidance recommends determining compressor requirements according to the flow rate of the irrigation zone and warns against excessive pressure.
Professional landscapers should always follow the irrigation system and component manufacturers' specifications and ensure the compressor is properly regulated for the system being serviced.
There is no single CFM requirement that applies to every irrigation system. Required airflow depends on factors including irrigation zone flow, pipe diameter, pipe material, number and type of sprinkler heads, number of zones being serviced, and compressor duty cycle. A useful starting point is to determine the irrigation system's normal gallons-per-minute flow for each zone.
Colorado State University Extension provides this rule of thumb:
GPM per zone ÷ 7.5 = required CFM
For example, using that formula:
|
Irrigation Flow |
Approximate CFM |
|
150 GPM |
20 CFM |
|
225 GPM |
30 CFM |
|
300 GPM |
40 CFM |
|
375 GPM |
50 CFM |
|
525 GPM |
70 CFM |
|
750 GPM |
100 CFM |
This is a sizing reference for the specifications of the irrigation equipment being serviced. Professional contractors should always verify the design and pressure limitations of the specific system.
It can be tempting to increase compressor pressure when water is not clearing quickly enough. However, higher pressure does not necessarily compensate for insufficient airflow. Excessive pressure can damage irrigation components.
Industry professionals interviewed by Landscape Management recommend concentrating on high air volume at controlled pressure. The publication's winterization guidance discusses approximately 50 PSI for some applications while emphasizing that pressure must remain within the limits of the system being serviced.
Colorado State University Extension similarly identifies maximum pressure considerations for common irrigation piping, including rigid PVC and polyethylene.
The key principle is clear:
Use enough airflow to move the water rather than excessive pressure to force it out.
This is one reason professional contractors should use a regulator and understand the irrigation system before beginning a blowout.
Duty cycle describes how long an air compressor can operate within a given period before it needs to recover or stop to cool down. A compressor rated for 100% duty cycle can operate continuously under its rated conditions. A compressor with a lower duty cycle must periodically stop. That distinction can become important during peak fall winterization season.
A landscaping contractor may have dozens of properties scheduled in a day. Waiting for an air compressor to recover between zones or properties adds non-productive time to the schedule. VMAC explains the operational differences between the technologies in its guide to rotary screw vs. reciprocating air compressors.
Rotary screw air compressors produce continuous airflow and are designed for 100% duty cycle operation. Reciprocating compressors typically depend on an air receiver tank and cycle as stored compressed air is consumed and replenished. The advantage of continuous-duty air is the ability to maintain the required airflow without repeatedly waiting for an air receiver tank to refill.
Reciprocating air compressors remain common because they are familiar, widely available and generally have a lower initial purchase price. For contractors who use compressed air infrequently, that may be sufficient.
According to VMAC’s 2026 State of the Mobile Compressed Air Industry Report, more than 73% of air compressor users surveyed prefer rotary screw technology over reciprocating compressors. Rotary screw compressors provide continuous airflow with a 100% duty cycle, eliminating the need to wait for an air receiver tank to refill. For busy landscaping crews, that can mean less downtime during blow-outs and more efficient use of a limited fall winterization season.
Professional landscaping companies performing large numbers of winterizations should look beyond purchase price and consider how the compressor affects the entire workday. Rotary screw compressors like the systems offered by VMAC, provide several characteristics that can benefit mobile landscaping operations:
Continuous airflow: Rotary screw compressors provide compressed air continuously rather than depending primarily on stored air in a large receiver tank.
100% duty cycle: Crews can continue working without mandatory compressor recovery periods.
Compact packaging: Rotary screw technology can produce substantial airflow from relatively compact systems.
Reduced weight: Lightweight equipment can preserve work-truck payload for tools, parts and landscaping materials.
Vehicle integration: Some rotary screw compressors, such as those offered by VMAC, can be mounted directly to or integrated with a service truck or van.
In November 2025, Landscape Management reported that labor shortages and increasing operating costs are pushing contractors to evaluate equipment according to how effectively it improves crew productivity and reduces downtime.
Turf Magazine's 2027 Equipment Forecast reached a similar conclusion, reporting that landscaping contractors increasingly value equipment that is easier to maintain, versatile and capable of helping crews accomplish more during the workday. For irrigation contractors, compressor selection can be viewed through the same lens.
For a professional landscaper, the important measurement is how efficiently can the crew complete the entire property and move to the next customer.
Small delays multiplied across multiple properties can consume significant labor hours during a short fall season. This is particularly important because landscaping companies continue to face labor and margin pressures.
The National Association of Landscape Professionals reported in 2026 that revenue growth and customer acquisition remained major priorities for commercial landscape companies, while labor costs, materials and operational efficiency remained important business concerns.
Similarly, Landscape Management's 2026 Industry Confidence Survey found that staffing and labor shortages continued to create pressure for landscape contractors. Equipment that reduces setup time, waiting and unnecessary handling can therefore contribute to a more productive winterization operation.
Choosing the right compressor for irrigation winterization is about more than pressure. Air volume is critical to effectively moving water through and out of irrigation lines. As Matt Bruns of Toro explained in Landscape Management, “the goal is not to use high pressure, but high air volume (cubic feet per minute) to push the water out of the system.” Read the full Landscape Management article.
Mobility becomes especially valuable when crews complete multiple winterizations every day. A compressor permanently carried on or integrated into the landscaping truck eliminates the need to load and unload a compressor for each day's work.
Vehicle-mounted systems can also help reduce the amount of equipment being moved around the property. For contractors evaluating mobile compressed air, VMAC provides a broader guide on how to choose a mobile air compressor, including considerations such as CFM, PSI, compressor technology, vehicle integration and available space.
The appropriate configuration ultimately depends on the landscaping company's vehicle, workload and typical irrigation systems.
For contractors who want a self-contained compressor that does not depend on the work truck's engine or hydraulic system, a gas-driven rotary screw air compressor can be an effective option.
The VMAC G30 gas powered air compressor produces 30 CFM at 100 PSI and has a 100% duty cycle. For irrigation winterization, the compressor's output must be appropriately regulated to the pressure required by the irrigation system.
The G30 is available in standard and stacked configurations, allowing contractors to choose a layout that better fits their vehicle and available cargo space.
For landscapers whose typical winterization work falls within the G30's airflow capabilities, the combination of compact packaging, continuous airflow and independent gas power can make it well suited to mobile irrigation work.
Tow-behind compressors are commonly used for irrigation winterization, but their capacity may exceed what is required for many residential and light commercial systems. HydroCorp notes in their “Winterization & Cross-Connection Control: The Right Way to Protect Water Systems” blog that many trailer-mounted compressors deliver around 185 CFM at 100 PSI or more, while considerably less airflow and pressure may be sufficient for many irrigation applications. It cautions that excessive pressure can damage seals and other system components.
For landscape contractors, this makes compressor sizing an important consideration. VMAC's compact rotary screw systems provide continuous airflow at 100% duty cycle without requiring contractors to tow a separate compressor.
VMAC’s G90, for example, is designed for operators who need high airflow, higher pressure capability, and jobsite versatility in one compact air compressor. The G90 gives landscape crews substantial airflow in a compact, portable package while allowing pressure to be regulated to suit the irrigation system being serviced. With VMAC’s FlexDrive AirFlow Management System*, the G90 automatically adapts to deliver the right combination of air flow and pressure for the job, providing up to 90 CFM at 100 psi continuously or up to 50 CFM at 170 psi for high-pressure applications.
A higher-output compressor can provide additional capacity for larger irrigation systems, but contractors still need to regulate output pressure according to the system being serviced. More compressor capacity does not mean more pressure should be applied to the irrigation system. The purpose of the additional compressor capacity is to provide sufficient airflow for the application.
Landscaping businesses that want to preserve cargo or deck space can also consider an engine-mounted air compressor. UNDERHOOD® air compressors designed and manufactured by VMAC mount and are integrated within the vehicle's engine compartment and use the truck or van engine to power the compressor.
Depending on the model and vehicle application, UNDERHOOD systems provide different levels of continuous airflow while eliminating the need to carry a conventional standalone compressor on the truck deck. For landscaping operations carrying tools, irrigation parts, fittings, seed, fertilizer and other equipment, preserving vehicle space can be valuable.
It can also simplify the crew's daily workflow because compressed air travels wherever the work vehicle goes.
The compressor is only one component of an efficient irrigation winterization program. A landscaping company can improve productivity by standardizing the equipment carried on every winterization vehicle, including appropriate hoses, adapters, fittings, regulators and personal protective equipment. Technicians should also have access to accurate customer information, including irrigation-zone layouts and notes from previous visits where available.
A Nov 2025 feature from Irrigation & Lighting described how irrigation professionals are moving from reactive repair work toward proactive maintenance and asset management. Consistent preventive maintenance and seasonal procedures can improve long-term irrigation-system performance while strengthening the contractor's relationship with the customer. Winterization can therefore become more than a one-time fall appointment.
It can be part of an annual irrigation maintenance relationship that includes spring startup, inspections, repairs, controller programming and ongoing system optimization. Contractors who need help determining their broader compressed-air requirements can also review VMAC's air compressor sizing guide for air tools.
Sprinkler winterization will always be seasonal, but the equipment used to perform it can influence productivity throughout the year. The right mobile air compressor should provide the airflow required for the irrigation systems being serviced while allowing technicians to carefully control pressure. For professional landscapers performing winterizations day after day, additional factors such as continuous duty cycle, equipment size, vehicle payload, setup time and mobility become increasingly important.
Landscape Management reported in 2026 that contractors increasingly look for equipment that improves productivity in response to ongoing labor challenges, while Turf Magazine noted that equipment selection is increasingly about getting more value from every crew, machine and workday. Compressed air should be evaluated the same way.
The goal is to build a winterization setup that helps the crew arrive, connect, complete the job correctly and move efficiently to the next customer. For landscaping businesses completing dozens or hundreds of irrigation winterizations every fall, those minutes can add up quickly.
Explore VMAC air compressors for landscaping and sprinkler winterization to compare mobile compressed-air options for professional landscaping operations.