An HVAC system includes equipment and controls that work together to heat or cool a home. When something changes, the first visible symptom may not identify its cause. Write down what you observe, including thermostat settings, which rooms are affected and when the issue occurs. Veterans Heating, Air Conditioning, Plumbing and Electrical helps homeowners discuss HVAC concerns, including air conditioning repair in Poway and service in San Clemente, CA. Share the details when you contact the team and ask what the next step involves. After an assessment, you can request an explanation of the findings and the available options for your system.