Upgrade your large-space comfort with this 18000 BTU smart WiFi window air conditioner. engineered for US households needing powerful heating and cooling. Designed for 300-400 sq ft rooms (living rooms.  bedrooms. home offices). it features WiFi connectivity and versatile all-season functions—cooling. heating. dehumidifying. and fan modes—to adapt to every weather condition. Powered by eco-friendly R32 refrigerant (low ozone depletion and global warming potential). it operates on 208/230V power (15A time-delay fuse/circuit breaker required) and meets UL safety standards with an LCDI leakage-detecting power cord.Enjoy flexible installation: it fits 28”-41” standard double-hung windows (19” vertical clearance needed) or can be mounted through-the-wall (requires a 23 7/8”×18 1/4” wooden frame. max 8.5” wall thickness). The package includes: 1×window air conditioner. 1×remote control (2 AAA batteries). 1×top rail. 2×window filler panels (left/right). 2×window support brackets. 2×sill angle brackets. 1×sash lock. 1×window sash seal foam. 1×foam top window gasket. 4×1/2” bolts/nuts. 4×5/8” bolts/nuts. 10×5/16” screws. 2×1/2” screws. 20×washers. 2×side retainers. and 2×insulation strips (E-star model only). Basic tools (Phillips screwdriver. drill) are required. and the unit’s 3° rear tilt ensures proper drainage.Control comfort anytime. anywhere: connect to WiFi for app-based remote control (monitor usage. set schedules. adjust settings away from home) or use the included remote for on-the-spot adjustments. ECO mode saves energy by cycling off when the set temperature is reached. while sleep mode optimizes temp and fan speed for nighttime comfort. The 3-speed fan delivers targeted airflow via directional louvers (horizontal/vertical adjustment). and the intuitive control panel displays mode. temp. and timer status.