These old bins are nothing special. Dad buuilt them back in 1968, while I was away doing other duties. They are 24' X 5 rings and I always had trouble storing wheat in them and getting it back out without having bug problems. Thorough cleaning and then spray with Malathion or tempo. Treat the wheat as it went in; with Malathion or Reldan, and some years it would take a dose of the Phostoxin pellets -- and I'd still have bugs and IDK (insect damaged kernels) dockage. I could wait for the wheat to get to 10% moisture and even then I'd have a cone of bugs at the top. About ten years ago, I had had about all the bug type fun a guy could have, so I put a simple aeration system in the two bins.

As you can see, dad was not much for rebar, and he skimped on the ready-mix. Still it's cheap storage and I can put 15% to 16% moisture wheat in these and it comes out with no bug damage. The blue cable you can see running upwards from the tubes is a temp sensor cable.

Here's an outside shot of the two bins:

I used to just get by with one fan, that I'd move from bin to bin. A few years ago, my son Wane asked me what would be cheaper: Another fan that didn't need to be wrestled with or a trip to see the doc about some corrective back surgery? I added another 3 HP in-line centrifugal fan. You can see the blue temp cable output in these pics. The cable has four temp sensors along its length from bottom to peak. Plug in the reader box and you can monitor the grain temp without climbing ladders when it is cold and slippery out.

Here's a close up shot of a three cable port that's mounted on my larger bins.

I really don't remember the exact cost for the cables. I think, less than $200 for the single run cable. Reader box was another $200 or so?? That cost gets spread across all the temp sensor equipped bins.

Now storing grain bug free gets done like this: Sweep and clean the floors of the bins, put in wheat, run fans for a couple weeks if the wheat was much above 14% when it went in, monitor temp and run fans to get the grain to 70° (bug activity slows way down here) as soon as conditions permit, run fans for a couple nights to get temp to 50° or cooler (bugs go dormant here) as conditions permit, Run fans to get grain to 20° or cooler (bugs die at this point) as conditions permit. Once I have the grain to 20°, I just leave it alone until it comes time to take it to market. Some folks will run the fans on the coldest nights, thinking it is better to get the temps to the minus 0° range or colder. Bug guys assure me that it isn't really necessary. I tend to think they're right. I have had no bug problems since I've done this. No expensive chemicals wasted on lesser grain borers, that are resistant to both Reldan & Malathion either.