Cooling and heating a small space with delta 2 max as only power source

Hello. I am trying to determine what would be best for the following scenario

- Have a delta 2 max and 400w solar panels to recharge.

-Want ability to cool in the summer and heat in the winter, just one room of the house in a grid-down situation. Just enough to keep it bearable on extreme temperature days.

What do you think the best product(s) would be for this? Considering the limited capacity of 2 max, yet small space to climate control?

Thank you