greenhouse Greenhouse question for Central California

My neighbor gave me a small metal framed 8x10 greenhouse with the clear plastic. Can I keep pepper plants alive without adding a heat source through the winter ? Thanks !
Agreed. A small space heater with a thermostat on the lowest setting should serve just fine. It should only kick on during the wee hours. I have mine on a small, footstool to keep it off the ground and it works well with outside night temps into the low 20s.
Something like this.