Goodman air conditioner runs but does not cool the house adequately

Safety first: Turn off power at the breaker and disconnect before removing panels. Do not open the refrigerant system yourself.

Steps to improve cooling:

• 1. Replace air filters: Install new filters in the Goodman air handler or furnace. Use the correct size and avoid overly restrictive high-MERV filters unless ductwork is designed for them.
• 2. Clean return and supply grilles: Vacuum dust from all registers and returns. Ensure furniture or rugs are not blocking airflow.
• 3. Clean outdoor condenser coil: Remove debris from around the Goodman condenser. With power off, remove the top fan assembly if needed and rinse the coil from inside out using a garden hose at low pressure.
• 4. Check thermostat settings: Set the thermostat to COOL and fan to AUTO. Verify the temperature setpoint is at least 3–4°F below room temperature.
• 5. Inspect attic or crawlspace ducts: Look for crushed, disconnected, or leaking flex ducts. Reconnect loose ducts with proper mastic and straps.

When to call a professional: If cooling is still poor, a technician should check refrigerant charge, measure temperature split across the coil, and evaluate system sizing and duct design.