What would cause the high pressure line (Hot line) on an A/C to be cold to the touch?

Question

A/C doesn't seem to be cooling properly

Answer 1

The refrigerant may not be circulating, meaning the compressor is shot. Or, the expansion valve in the house could be wide open, so that there is not much of a pressure differential between the high and low pressure lines. Pressure gages on both lines should help to diagnose the problem. Be careful if you have a newer system with R-410 refrigerant as it operates at a much higher pressure.

Answer 2

Check the air filter and indoor coil to see if you have enough air flow across the coil.

You could be low on refrigerant, you will need to contact a reputable company and have the pressure & temperature checked. This is not something you as a homeowner can do yourself.

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