We performed meticulous maintenance on a Lennox Signature Series air conditioner, model SL18XC1, initiating with the thorough cleaning of its condenser coils to optimize efficiency and ensuring the refrigerant levels were precisely maintained. A new 3M Filtrete Elite Allergen Reduction filter, model EA03DC-6, was installed to improve indoor air quality. Additionally, we fine-tuned the thermostat settings and thoroughly inspected the electrical connections to guarantee the unit's superior performance.