Haarmann Heating & A C: Certified HVAC Services Serving Wentzville, MO 63385

Yes, a failed capacitor is one of the most common causes of AC failure in our area, especially during our hot Missouri summers. The capacitor provides the jolt of energy needed to start the compressor and fan motors. When it fails, your unit may hum but not start, or it may trip the breaker. Our technicians can quickly test and replace a faulty capacitor to restore your cooling, often the same day.

Thermostat malfunctions can stem from several issues common in local homes. It could be dead batteries, a tripped breaker, a blown fuse on the furnace control board, or accumulated dust affecting the unit. Sometimes, it's a wiring issue. We start with simple checks and can professionally diagnose the root cause, whether it requires a reset, a wiring repair, or an upgrade to a more reliable programmable or smart thermostat.

First, check the basics: ensure your thermostat is set correctly and has power, and check your home's main electrical panel for a tripped breaker. If those are fine, it's time to call us. Sudden failures are often related to common local problems like capacitor failure, a dirty air filter restricting airflow, or a safety switch being triggered. Our team can provide prompt, expert troubleshooting to identify and fix the issue efficiently.