LM707 / LM708
Do you know how long it takes to complete a car refrigerant replacement? Do you know how to choose the right AC refrigerant recovery machine for your needs? As automotive air conditioning systems become more complex and environmental regulations grow stricter, the refrigerant recycling filling machine has become essential equipment for auto repair workshops and A/C service providers. With a wide variety of AC recovery machines on the market, this guide focuses on two AUTOOL models to help you make a smarter and more informed purchase decision.
Working Principle

How an AC refrigerant recovery machine works

1. Vacuuming, Precise Filling, and Intelligent Control Make Refrigerant Replacement Faster and Safer

The AC refrigerant recovery machine works by vacuuming, precise filling, and intelligent control to achieve efficient, safe, and environmentally friendly operation. During the vacuuming stage, the machine uses a vacuum pump to remove air and moisture from the air conditioning system, preventing impurities from affecting refrigerant performance.

Next, flow control valves and pressure sensors help transfer refrigerant from the storage tank into the system according to preset values so that filling remains accurate. Throughout the process, the system continuously tracks pressure and flow in real time to prevent overfilling or underfilling. If an anomaly occurs, the machine automatically stops and triggers an alarm.

The equipment also includes built-in safety protection mechanisms that monitor temperature and pressure to help prevent refrigerant leaks or system overpressure, ensuring safety for both the machine and the operator.

Why It Matters

Why choose AUTOOL AC refrigerant recovery machine?

2. AUTOOL Can Cut Refrigerant Replacement Time From Hours to Minutes

AUTOOL AC refrigerant recovery machines are built for efficiency in automotive repair. Compared with most brands on the market, whose refrigerant recycle and filling machines typically take 3 to 4 hours to complete a single refrigerant replacement process, the AUTOOL AC recovery machine can perform the same task in just 30 to 40 minutes.

Save waiting time

Faster replacement helps save significant waiting time, shortens customer waiting periods, and allows more daily service orders. Compared with traditional manual methods, the workflow can save approximately 30% to 50% of time.

Improve technician efficiency

Shorter job cycles free up valuable work hours and reduce idle time in the shop.

Reduce operating cost

Less energy consumption and less resource waste help lower overall operating costs.

In short, AUTOOL saves nearly 90% of the replacement time with real performance, making it a strong choice for workshops that value efficiency and professionalism.

Model 1

AUTOOL LM707 AC refrigerant recovery machine

3. LM707 Is a High-Cost-Performance Choice for Small Workshops and R134a Service

The AUTOOL LM707 refrigerant recycle filling machine is a high-cost-performance machine ideal for small workshops or personal use. It supports the traditional R134a refrigerant, making it suitable for the needs of most vehicle owners and repair technicians.

  • Fully automatic operationParameters can be preset, and the machine completes the entire process automatically based on instructions.
  • High-precision electronic scaleAn integrated electronic scale accurately measures refrigerant weight for precise recovery and filling.
  • Large capacity tankThe refrigerant tank can store up to 12 kg of refrigerant, allowing continuous work for dozens of vehicles.
  • New and used oil bottlesTwo 350 mL oil bottles are included for draining compressor oil and injecting new oil.
  • Wide compatibilityThe patented pipeline design supports efficient gas pump recovery and liquid recovery.
  • Self-protection functionThe machine automatically stops and alerts the user if an issue occurs during the process.
Model 2

AUTOOL LM708 AC refrigerant recovery machine

4. LM708 Adds Dual-System Operation and a Larger Feature Set for Bigger Shops

The AUTOOL LM708 refrigerant recycle filling machine is an all-in-one fully automatic intelligent machine that integrates refrigerant recovery, vacuuming, filling, and charging functions. It is ideal for medium to large workshops and features a 7-inch color touchscreen for clear and intuitive operation.

It supports both R134a and HFO-1234yf refrigerants and adds smart features that help improve work efficiency and accuracy in workshops, garages, and 4S service areas.

Independent dual-system operation

Supports both R-134a and HFO-1234yf refrigerants simultaneously, with 10 kg capacity for each refrigerant type.

Five high-precision electronic scales

Accurately weighs refrigerant for the R134a tank, HFO-1234yf tank, PAG, POE, and waste oil.

Built-in database and printer

The built-in database covers over 20,000 vehicle models and refrigerant types, and maintenance data can be printed out when needed.

Patented oil bottle design

Prevents new oil from coming into contact with external air, helping avoid moisture absorption and deterioration.

Automated workflow

Users can preset parameters and let the machine complete the entire process automatically, with support for individual functions as needed.

Wide applicability

Suitable for gasoline vehicles, hybrid vehicles, and new energy vehicles that need air conditioning service.

Differences

AUTOOL LM707 VS LM708 differences

5. LM708 Offers More Flexibility, While LM707 Stays More Budget-Friendly

When comparing the LM708 and LM707 AC refrigerant recovery machines, the LM708 features a more advanced dual-system design, capable of handling both R-134a and HFO-1234yf refrigerants simultaneously, with a 10 kg capacity for each type. This gives the LM708 more flexibility for workshops that handle both refrigerant families.

LM707

Best for small workshops, beginners, and users who mainly work with R134a.

LM708

Best for larger workshops, mixed refrigerant service, and technicians who need more control and automation.

AUTOOL LM707 and LM708 AC refrigerant recovery machine comparison
LM708 adds dual-system capacity, database support, and more automation compared with LM707.

The LM708 also includes a built-in refrigerant database covering over 20,000 vehicle models and a patented oil bottle design that helps prevent moisture absorption and oil degradation. A practical tip from the original article recommends replacing the dryer filter every 100 kilograms of recovered refrigerant to keep the machine running steadily.

The original article also notes that replacing the dryer filter every 100 kilograms of recovered refrigerant helps ensure the long-term stable operation of your AC refrigerant recovery machine and maintains refrigerant purity and quality.

Purchase Recommendations

6. Choose the Right AC Refrigerant Recovery Machine by Refrigerant Type, Workshop Size, and Budget

  • Refrigerant typeIf your workshop mainly handles R134a refrigerant, the LM707 is sufficient. If you also need to handle HFO-1234yf, the LM708 is the better choice.
  • Workshop sizeThe LM707 is economical and practical for small workshops or individual technicians. The LM708 is better for shops with larger refrigerant recovery and filling volume.
  • Ease of operationThe LM707 is simple to use and well suited to beginners. The LM708 adds a smarter operating system for users who need more functions and precise control.
  • BudgetThe LM707 is more budget-friendly, while the LM708 costs more but adds dual-system operation and a built-in database to improve efficiency.
Summary

7. Both Machines Support Better A/C Service, But the Right Choice Depends on Your Workshop

Choosing an AC refrigerant recovery machine that suits your specific needs can improve work efficiency while also supporting quality and safety in air conditioning maintenance. Depending on workshop size, budget, and service requirements, both the AUTOOL LM707 and LM708 are solid options.

Whether you run a small workshop or a large repair center, AUTOOL’s AC refrigerant recovery machines can provide reliable support for daily operations and help make refrigerant replacement faster, cleaner, and more professional.

Need a faster refrigerant replacement workflow?

Use the related product cards below to compare LM707, LM708, and other AC service tools for your workshop.

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