Just completed a comprehensive AC maintenance for a family in Alvin. System was running but not cooling efficiently - found the evaporator coil covered with dust and debris. Thoroughly cleaned the coil, replaced the air filter (was completely clogged), and checked refrigerant levels which were slightly low. Added refrigerant to manufacturer specs. Also cleaned condensate drain line which had minor blockage and could have caused water damage soon. Checked electrical connections and tightened a few loose ones. Cleaned condenser coil outside which had accumulated quite a bit of dirt affecting heat transfer. After service, system is running at optimal efficiency again, reducing energy consumption by approximately 15-20%. Homeowner was pleased with the improved cooling performance and quieter operation. Recommended scheduling next maintenance before summer peak for best performance.