How to Resolve Filling Freon Twice a Year in Your Chicago Home


During the summer months, with Chicago’s terrible heat waves, a home air conditioning system has to work very hard to keep the home at a cool temperature.  Sometimes only shutting off one time per hour and kicking right back on five minutes later.  This is especially true for a home that has refrigerant leaking out of the system.  When the refrigerant gets low the unit can not cool properly and might not ever bring the home to temperature.

As the summer gets half over we begin getting repeat calls from customers that have added freon to the system in the beginning of the year and need it changed again.  Every time our company fills freon into a home split system, we explain the drawbacks of not finding out where the leak is coming from.  If the refrigerant is low in the system THERE IS A LEAK, plain and simple.

When we come out to service your air conditioning equipment when there is a refrigerant leak, there are a couple of things that need to be addressed:

  1. How much freon is lost from the system.  This is a good starting point to determine what kind of leak we are dealing with.  If only a couple of ounces are gone there could only be a leak in the valves or caps, and the problem can easily be resolved.
  2. Generally if there is a call for no cooling there is a decent amount of freon loss from the system.  In this case we need to perform a leak test on the system.  There are many different types of tests out there to find a leak, but we find that the method used by our air conditioning technicians are the best.

Here is an example of a leak test procedure for split systems in Chicago:

  • Take all of the existing refrigerant in the system and lock in the compress if the system has service valves in it and the capability to do so.  If not reclaim all the refrigerant in the system to perform test.

  • Second, we isolate the condensing unit (air conditioner) from the lines and the evaporator coil (inside coil above the furnace).
  • Next, pressureize the lines and evaporator coil to 200 PSI of Nitrogen and let hold for twenty minutes.  If the lines and evaporator coil holds then the leak is within the condensing coil or in the compressor.  If the lines dont hold then the problem is within the lines or evaporator coil.
  • In the case of the lines not holding there is further investigation that needs to be followed up with.  At this point we would cut the lines at the evaporator coil and pressureize them.  If they hold then the leak is in evaporator coil, if they leak then the problem is in the lines.

If you live in Chicago, and your air conditioning system’s freon depletes fast, call us now for immediate service: 773-234-4575

Chicago Heating Repair
3526 S. Paulina St. ChicagoIL60609 USA 
 • 773-234-4575

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