heating & cooling shop ????'s

[pocoloco71]

shop is 30x30. 2 turbines on top of roof, ceiling is open, have not insulated the walls either. Climate is east Texas. Jan-march cold march to may ok
may to septemberish hot, oct-jan back to cold to colder. I got to do
something. I got fans. for the summer. But nothing big. My buddy bought
an attic fan and built a frame around it for summer. And some have heat
pumps, window units, woodburning stoves and on and on. Lots of u have
made your decisions. What did yall do. I going to do something and I'm
leaning towards the heat pump. Factor in that the heat doesn't me like
the cold. I mean high 40's down and I just come on back inside(don't u
northern dudes start laughing). Thanks for any views.