A & J Hvac - Hazelwood's Certified HVAC Repair

Signs of a malfunctioning thermostat in your Hazelwood home include your HVAC system not turning on/off, rooms feeling much hotter or colder than the set temperature, or a blank display. Our technicians will first check for simple issues like dead batteries or incorrect settings. We then test the wiring and calibrate the unit. If needed, we can expertly repair or replace your thermostat with a reliable model to restore precise temperature control and comfort.

Our local climate and seasonal changes mean your HVAC system works hard year-round, pulling in air that can contain pollen, dust, and other particulates common to the area. A clogged filter restricts airflow, forcing your system to work harder, which increases energy bills and can lead to breakdowns. During our service visits, A & J Hvac will check and replace your air filter. We can also recommend the best filter type for your home and set up a maintenance schedule to ensure optimal airflow and system health.

To prevent thermostat and air filter problems, we recommend bi-annual HVAC tune-ups—once in spring for your cooling system and once in fall for heating. Our comprehensive maintenance visit includes inspecting and testing your thermostat, cleaning or replacing the air filter, checking all electrical connections, cleaning system components, and ensuring everything operates at peak efficiency. This proactive care from your local experts at A & J Hvac helps avoid unexpected repairs, extends your system's lifespan, and keeps your energy costs down.