There is no fixed model for the ac freon charge rate, which is influenced by many factors, such as air conditioning type, air conditioning brand, area, maintenance services, etc. Some of the reference positions are as follows:

These are only approximate prices and specific charges may vary depending on the maintenance services. Therefore, if you want an accurate offer, it would be preferable to consult directly with the air conditioning maintenance services in your area。
Air-conditioning freon process
The process of charging freon with air conditioners consists mainly of the following steps:
Check if air conditioners need freon recharge. Normally, air conditioners are used for a period of time, which may result in reduced refrigeration effects for a variety of reasons, at which point consideration will need to be given to recharging air conditioners with fluorines。
Preparation tools and equipment. Specialized tools and equipment are generally required, including dedicated freon bottles, pressure meters, gas pipes, etc。
Connecting devices. Freon bottles and air conditioners are connected and freon 4 is injected through the equipment。
Monitoring and adjustment. Following the injection of freon, the operation of the air conditioner will need to be tested through equipment and adjusted as necessary。
Finish full fluorine. Once all necessary steps have been completed, the equipment can be shut down and the fluorinated process can be terminated。

Attention
In recharging freon with air conditioning, the following needs to be noted:
Safety first. Full freon is a professional undertaking that requires compliance with relevant security requirements to ensure operational safety。
Professional operation. While some simple operations can be performed at home, it is recommended that the specialized fluorine-filling be done by professional maintenance staff。
Regular maintenance. In addition to recharging freon, regular air conditioner maintenance is important to effectively extend the service life of air conditioners。
I hope that this information will be helpful to you, and if there are any other questions, continue to ask。





