Key specifications of window air conditioners (large 24 unit compressor): Cooling capacity: Ranges between 18,000 to 24,000 BTU, covering medium to large areas. Compressor type: Rotary or "giant" (large), specially designed to withstand very high temperatures (Tropical - T3). Refrigerant gas: Mostly environmentally friendly R410A, or R22 in some models. Performance: Cooling only or hot/cold, with high efficiency in air distribution (four-way). Warranty: Minimum two-year comprehensive warranty and 5 years on the compressor. Electricity: Operates at 220 volts and 60 Hz frequency. Additional features: High-quality air filter for air purification, and a durable, rust-resistant body.