Well ..one of the possible reasons is that the compressor lost refrigerant. I just realized that. My compressor was doing the job but not well enough. I was not experienced enough so I could say that the tin around the coils should have been a lot colder than it was and the house would eventually reach the set temperature but after some time which made me thing that everything was OK it was just the thermostat that was not getting it. One of the symptoms that was visible to me was "no more condense" hence my question
