Upgrade your large-space comfort with this 18000 BTU smart split air conditioner, part of the SEER 21 high-efficiency series, engineered for US households. Equipped with WiFi connectivity and eco-friendly R32 refrigerant, it delivers robust cooling, heating, and fan functions while minimizing energy consumption. Operating on 230V/60Hz power (dedicated circuit required), it’s ideal for 300-350 sq ft areas like large bedrooms, open-concept living rooms, or home offices.Included in the package: 1×indoor unit, 1×outdoor unit, 1×YKR-T121E remote controller, 2×AAA batteries, 2×4m connecting pipes, 1×drain pipe, 1×power cable, 1×mounting plate, 1×pipe protection ring, 1×putty, 1×plastic strap, and 2×user manuals. Installation requires a certified contractor – the kit fits standard wall installations with a 5°-10° slanted wall hole for proper drainage, and connecting pipes support lengths from 9.8ft (3 m) to 98.4ft (30m), with additional refrigerant (0.258oz/ft) needed for pipes over 25ft (7.6m).Control comfort seamlessly via the WiFi app (scan QR code for iOS/Android download) or remote: set 24h auto on/off timers, adjust temperature, and toggle swing mode for uniform airflow. The indoor unit features a force switch for emergency use (AUTO mode, 77°F/25°C) if the remote is lost. Safety highlights include proper grounding, overcurrent protection, anti-freeze function, and compatibility with R32 refrigerant leak detection tools.18000 BTU split air conditioner, SEER 21 smart AC, WiFi enabled split AC, large room split air conditioner, 230V split AC, R32 refrigerant AC, US home split air conditioner, cooling heating split AC, high-efficiency split AC