How do you know if something is wrong with your AC?

Determining whether something is wrong with your residential air conditioning system involves observing changes in indoor comfort, unusual mechanical sounds, and unexpected utility bill spikes. Key warning signs include your home feeling uncomfortably warm or humid even though the thermostat is set low, the system blowing warm or room-temperature air from supply vents, or the outdoor condenser unit emitting loud grinding, screeching, or persistent humming noises. You might also notice frequent circuit breaker trips, a completely blank thermostat display screen, or water pooling around the indoor air handler due to clogged condensate lines. You can troubleshoot by checking your air filter and thermostat settings. You can verify system health when routine diagnostic checks confirm proper airflow, stable electrical draws, and correct cooling temperatures across all supply registers.