Should AC return line be hot?

What temperature should the refrigerant lines be? When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. The smaller uninsulated liquid line should be warm to the touch after the system has been operating for 10 or 15 minutes.Click…

What temperature should the refrigerant lines be? When the system is operating, the large insulated suction line should be cold to the touch and sweating at any point where there is no insulation. The smaller uninsulated liquid line should be warm to the touch after the system has been operating for 10 or 15 minutes.Click to see full answer. In this manner, what causes AC lines to get hot?It usually has to do with a unit that has a thermal expansion valve as a metering device. It is associated with refrigerant starvation (for whatever the cause). The thermal expansion valve senses the temperature of the suction line, when it gets warm the valve opens up wide and floods the evaporator with refrigerant.Beside above, what should the temperature difference be between supply and return? The temperature your AC puts out is relative to the temperature you set on your thermostat. So even though there’s no single ideal temperature, you do want a 16°–22° F difference from the supply air and return air. Professionals call this temperature difference the evaporator Delta T. Keeping this in view, should AC line be hot? A normal temperature would be around 90-to-100F. But if there was a problem (such as an overcharge, a defective outdoor blower, a very dirty outdoor coil, etc.), pressure inside the lines will be higher than normal, and as pressures get higher the temperature of the refrigerant inside gets higher as well.Should AC lines be insulated?The large, cold, low pressure line, carrying the evaporated refrigerant from the house, should be insulated to prevent condensation. The small line now carries the warm liquid refrigerant back into the house. No insulation is needed on this line because it is still warmer than the outside air.

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