Old fridge for mealworm breeding?

I've been learning from this amazing community for years and have been trying to problem solve something on my homestead and could use some extra help...

We are working to cut feed costs (like so many others) by raising mealworms for our ducks and chickens (ranging from 30-70 depending on the season). Currently we have a drawer system set up and it's working but not as quickly as we'd like. Since it's not temperature or humidity controlled in the garage, we are looking to improve that. We have an old upright fridge that no longer cools (it has no freezer area, so lots of fridge space).

Any tips on how I could use this fridge to improve our mealworm raising?

We do have a space inside we can put it by a door to easily shift them through the trays

These videos with farm-scale production may give you hints:

Jord:  https://www.youtube.com/watch?v=6Ag3EFfsRms

Long but very thorough, with lots of explanation and how-to details:  https://www.youtube.com/watch?v=FaGbQ6sZqSw

I tried using the drawer system for crickets, but lizards, spiders, and roaches got in, so I have to stick to more sealed containers, to try to keep them out.

I need to branch out to a second container (using a large plastic tub with glued-in screen top at the moment.  The plan is to make a screened top for an aquarium as the second habitat.

But perhaps thinking of the fridge as a small "room" like in the above videos...assuming there is enough air inside.  Since it has the shelves, that would help...maybe put trays in layers (to catch the eggs below, for example) like in the videos?

At least inside it's more temperature stable than perhaps the air in the room the fridge is in...?

The fridge itself would keep the pests out, I imagine.  My main concern would be adequate air to keep the worms and beetles alive.

Anyway, just some thoughts.  Please let us know what you come up with or try.  Always good to learn more!

Good point Alina! Maybe I'll drill some holes to improve air flow and put small screens over the holes to prevent other things from coming in.

Thanks for the video links! I'll watch and keep you all posted how it goes.

I saw another video where the guy drilled just one 3" hole in the bin cover, then hot-glued window screening over that.

Might be easier than multiple holes...

I'm thinking if these insects live and eat grains, that's often inside a bin or bag, no?  So they might not need as much air as we think they do.