I'm wondering the same thing. It's going to be a little colder here but not much. I did a trial run last week. One Chimney. It was about 40 outside. Empty water pan, no sand, water, saucer etc. After a half hour with all vents fully open it was 297 and falling so I started another half chimney. At about hour 1 it went it and raised the running temp to about 315. Here's the catch, I had a full pan of stuff following meatheads gravy recipe, which I wasn't a fan of but the girls like it so I'm probably going to do that tomorrow. I'm planning on starting two tomorrow, as of right now and hoping I can keep it near 325 with the vents closed. The temp did start rising just before I pulled it at a little over 2 hours for my 10lb bird.