Well you can spread that heat out in a larger space ("lung room" immediately outside tent) or exhaust it outside / isolated area away from lung room. Outside of that you can use a portable AC. A light in a 2x2 shouldn't be too hot relative to even a small-ish room. If you live in a hot area, you need AC or just struggle through it. Grow in cold season. Have the lights on at night. If it is a very arid region, an evaporative cooler might reduce a few degrees but not many. You'd want to ensure it doesn't not cause a high humidity - pathogen risk. These devices have a reduced effect with higher ambient humidity, so they are useless in high RH regions..