Duncan Mechanical Heating and Air Conditioning: Licensed HVAC Repair Serving Cape Girardeau, MO 63701

Common signs include your AC blowing warm air, ice forming on the refrigerant lines or evaporator coil, a noticeable hissing sound from the unit, and a sudden spike in your energy bills despite normal usage. If you notice any of these, it's important to call a professional like Duncan Mechanical for a diagnosis. Refrigerant leaks not only reduce cooling but can cause serious damage to the compressor.

For most Cape Girardeau homes, we recommend checking your air filter every month and changing it at least every 90 days. If you have pets, allergies, or during peak summer and winter months, consider changing it every 30-60 days. A clean filter is crucial for maintaining airflow, system efficiency, and your indoor air quality, helping to prevent strain on your HVAC unit.

Absolutely. Regular professional maintenance is the best defense against the most common HVAC failures. During a tune-up, our technicians perform over 20 key checks and cleanings. We spot small issues—like early signs of wear, minor refrigerant level drops, or dirty components—before they become major, costly repairs. This proactive care saves you money, extends your system's life, and ensures reliable comfort year-round.