Are portable ACs worth it compared to window units?

Window units are more efficient and quieter per BTU dollar. Portable ACs are worth it when you can't install a window unit — rental restrictions, casement windows, or HOA rules. The convenience of portability comes at a 20-30% efficiency penalty.

How loud are portable AC units?

Most portable ACs produce 50-55 dB, roughly equivalent to a normal conversation. The compressor cycling on and off is the main noise. For sleeping, look for units with a sleep mode that reduces fan speed and raises the target temp gradually.

Best Portable AC Units Under $300 2026