Build a warming/cooling box for maintaining temperature range year-round
I need to build a box about 75cm wide, 50cm tall, 50 cm deep, that will maintain a temperature range of 20-30 degrees C (about 68-86 F) in ambient temperatures of 0-35 C (32-95 F). What are my best options for heating and cooling?
For temperature regulation I imagine I'll be using an aquarium thermostat for the heating end of things. What would be best for cooling?
I am imagining a plywood frame with a plastic tray insert, covered with styrofoam sheets. Pretty simple stuff. It will probably hinge open on the front face. I'll be keeping fermenting and sprouting foods in it.
thanks for any help and ideas!