Q: What size window AC unit do I need?

Window AC sizing is based on the room's square footage. A general guideline: 5,000–6,000 BTU for rooms up to 250 sq ft; 8,000–10,000 BTU for 300–450 sq ft; 12,000–14,000 BTU for 500–700 sq ft. Rooms with high ceilings, direct sun exposure, or heavy occupancy may require additional capacity.

Q: What is the difference between a window AC and a portable AC?

Window air conditioners are installed in a window opening and exhaust heat directly outside. Portable air conditioners sit on the floor and use a flexible exhaust hose vented through a window or wall opening. Window units are generally more efficient; portable units offer flexibility for spaces where window installation is not possible.

Q: Do window AC units require professional installation?

Most residential window AC units are designed for homeowner installation. Commercial or heavy-duty window units may require professional installation for proper support and sealing. Always follow the manufacturer's installation instructions.

Q: What is EER and CEER for window AC units?

EER (Energy Efficiency Ratio) measures cooling efficiency at a single operating condition. CEER (Combined Energy Efficiency Ratio) includes standby power consumption. Higher EER/CEER values indicate more efficient operation. Current DOE minimum standards require 9.4–12.1 CEER depending on unit capacity.