I had the larger size reducer on for the beginning part of fall. With night time temps getting to just below freezing I switched to the smallest reducer (3/4"). Here is my concern. Daytime temps are still mid 50's maybe even touching 60. With the mouse guard on and the small reducer, it only really gives a 3/8" opening for air during the day. Now I know switching it back to the larger opening every morning and then getting home at night and switching it again, would declare me nuts. Is that small opening too stuffy for them during the day or is the larger opening to drafty for night. what does everyone with similar climate do here? I'm sure this isn't a huge issue here and I'm not panicing like I was with other issues, just curious as to what the majority do in this situation.