Hmmm, now I’m thinking of starting that corn a couple weeks earlier than I’d planned. I have a ‘honey do’ project now.
LMAO !!
HOT FRAMES can be used to extend growing season , or start earlier plantings outdoors for early spring.
You just have to be aware of daytime temperatures and available sunlight so that you don't 'steam' the new seedlings. A vent is as simple as a stick .
Both Cold frames and Hot frames are best if angled southward and higher in the back so they catch (Winter) maximum sunlight, and less sunlight reflectivity.