AC Troubleshooting: When Your System Isn't Keeping Up

When your AC struggles to keep your home cool during a New Jersey heat wave, it’s tempting to assume something major is wrong. In reality, many cooling issues come down to a handful of common—and fixable—problems. Before calling a technician, homeowners can check simple things like a dirty air filter, blocked outdoor condenser, incorrect thermostat settings, or a tripped breaker. These quick checks can often restore performance without the need for a service call.

One of the most useful diagnostic tools you can use is an infrared thermometer to measure the temperature difference between return air (going into the system) and supply air (coming out). A properly functioning AC system typically produces a 15–20°F temperature drop. If that difference is significantly lower, it can indicate issues like low refrigerant, airflow restrictions, or system inefficiency.

The best time to troubleshoot is as soon as you notice reduced cooling performance, not when the system fails completely. Ignoring early warning signs can lead to higher energy bills, increased wear on your system, and eventual breakdown—often during the hottest and most inconvenient times. A few quick checks can help you identify whether it’s a simple fix or time to call in a professional.