What size room will it cool?

Whynter rates this 12,000 BTU model for rooms up to about 400 square feet. Hot kitchens, sun-facing rooms and open floor plans will feel less cooling than a closed bedroom.

Does it need to be drained?

In dehumidifier mode you can attach a hose for continuous draining, which avoids emptying the tank. In cooling mode most moisture goes out the exhaust, but the tank still fills over long runs.

Expect noticeable fan noise, especially on high. Low fan is tolerable for sleeping; high fan is closer to a box fan on medium.

What comes in the box?

The unit, a remote, a washable filter, an exhaust hose and a window kit are included. You supply the drain hose if you want continuous draining.

Is the Whynter ARC-1230WNH worth it?

It is a capable dual-purpose cooler and dehumidifier. If you need dehumidifying as well as cooling, it earns its keep; if you only need cooling, cheaper single-purpose portables exist.

Does it work in a room without a window?

No. The exhaust hose has to vent hot air outside through a window or a compatible sliding-door kit, so a room with no opening to the outside is not a fit.