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1. Feel of large copper line at outdoor and tell me if it is cool, cold or atmospheric temp
Should be "beer can cold". If not if compressor is running you are most likely low on refrigerant. Do you have a thermometer to check air temp going into unit inside and air temp coming out of vents?
Any signs of ice on the indoor coil? If the indoor is electric look from underneath
Did you have both indoor and outdoor replaced?
You may have more than one thing going on here.First of all, if refrigerant charge is correct the suction line should be cold and sweating, not just slightly cool.
Refrigerant however should not effect your air flow if the coil is not icing.
If you had this installed by a contractor, I would get on phone and get them back out there.
I understand. You don't by any chance have refrigerant gauges do you?
I meant gauges to connect to unit to see what our operating pressures are.They are the first step in troubleshooting as once they are connected they tell us a lot of things about what may be the culprit.
It appears you may have more than one issue.One being why our airflow is not good and one being why refrigerant line is not cold.
There is no duct loose or anything that might be effecting air flow is there?
You can do a visual by looking to make sure duct cleaning people did not break any ductwork loose or leave anything disconnected.
Usually in attic or basement .Concentrate especially on the areas where the accessed to clean.