[colechristensen]

There are some IR bands that are transparent between the ground and space so if you optimize your emissions in those bands (because you are not an idealized black body) and insulate yourself from conduction and convection heating, you can beat your local surroundings and cool yourself lower than ambient to a useful degree.

https://en.wikipedia.org/wiki/Infrared_window

There are materials and even paints that have emission spectrums designed for this.

For example: https://www.parc.com/technologies/self-cooling-paint/

Normally you would just be in the same thermal equilibrium with everything else having similar emission spectrums you'd give and receive similar amounts of radiative heating and cooling. Tweak your spectrum and you tip the balance in your favor.