I intend to call a repair person, but I just want to make I've exhausted possibilities that don't involve messing with the refrigerant lines. The A/C was working yesterday with no problems (outdoor temp in the upper 90s), but today it started blowing room temperature air from the vents during the day (~85°F inside, outdoors again in the upper 90s), and same thing at night (~85°F inside when exterior temp was 70°F).

* Outdoor condenser fan is operational
* Thermostat is set to "Cool" and "Auto" fan (and there is no heat pump)
* Outside unit is clean, free of debris, manufactured in 2004 (Duncan)
* Indoor filter is pretty clean; no obvious air flow problems inside
* Compressor turns on and heats up to an exterior temperature of ~130°F (perhaps hotter, it had not been on too long before I checked)
* The larger, low-pressure, insulated line is very hot by the compressor (nearest 6 inches of pipes was ~115°F) and ambient temperature about 1 foot away from the compressor (~90°F); the smaller, high pressure line was also hot
* There are no visible signs of leaking refrigerant; none of the pipes are cool, let alone freezing

Mostly I'm just surprised that it broke so suddenly, though everything I checked seems to be working. Any common wiring issues that are consistent with these symptoms? Or can bad compressors exhibit these symptoms?