Adjusting an iRoast 2 profile for slightly cooler ambient temperature

[SJM]

Okay, folks, here's my set up.
My preference so far with roasts out of my IR2 is a profile that ends in the full 15 minutes with a TC reading of about 450. The beans are a beautiful dull brown. No shine. I think (remember I can't read the profile back out to double-check this) that the profile is 6 min@320, 3@375, 4@385, 1@390, 1@400.

Now, that works perfectly with a nice warm ambient outdoor temperature. Yesterday, however, was cool and breezy on the front porch, and the TC only read 434 when the roast was "done".

So, I'm thinking I need a parallel profile -- one for lower ambient temperatures (when it's in the 40s outside for example).

The question is: how would you suggest I adjust the profile that I like a lot to get the same results in a lower temperature situation? Each phase up by X degrees?

Any suggestions would be appreciated. I'd rather be able to keep roasting out front than bring the IR2 into the guest bathroom with the dryer venting stuff. It still makes the house smell a bit like burned coffee for a while....and outside is nice even when it's cool.

Thanks for any ideas you want to share.
Susan

[TimothyH]

I have had similar results with changes in ambient temp and humidity w my i-roast II. I live in the mid-west and my ambient temp in my unheated garage is anywhere from 98 f to -10 f.

I gave up on outside roasting and now have a set-up in my basement w (metal) dryer hose for exhaust. My results are still inconsistant but at least I get a usable result more often than not.

I have saved three profiles that I use for different conditions but I watch the beans w my eyes and watch the TC and hit cool when I think the beans are just right. I'm thinking about getting a hottop or some other drum roaster. It seems from what I've read here that they have more temp stability.

Tim