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| - On May 7, we called Lanz for an air conditioning problem in our house. At that time, the indoor air was not cooled down despite that the AC unit worked properly. The service person came and checked for leaking. He tried bubble leak search and detector search but was not able to locate the leaking. He recommended us to add refrigerant because he thought the leak might not be severe. Therefore, following his recommendation, we added 4 pounds of refrigerant. We paid $358 for that service (call slip number: 44850). However, only after 1 month, in mid-June the same problem occurred as the indoor air was not cooled down again. So we called Lanz. Lanz promised to come back to us each time we called, but for three times that we called during last week, no one ever came to check the problem. Last Thursday, we decided to call another company, the Champaign Heating & Air. The service person came last Friday morning. After checking our air conditioning system, he found the refrigerant was critically low. Using bubble leak search, he was able to locate the leaking area. In fact, the leaking was due to broken schrader valves. Moreover, the service person told us that he found the caps to the schrader valves were uncapped and put aside (when Lanz checked the unit last time), so that the refrigerant was gone so quickly within 1 month. The service person from the Champaign Heating & Air replaced the valves and put the caps back on, and the air conditioning was fixed. We paid $487 for that service.
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