Sound variation from good to incredible?


I notice that although my system always sounds good sometimes it sounds incredible. When all is right with ac and other factors I find I get a good 3D holographic type imaging with sound from everywhere but the speakers but other times the sound will still be good but less magical. Could this be ac issues and would a Keces IQRP 3600 conditioner help? 
mitchb
Aside from the equipment, warm up, content:

there have to be times when our hearing is better. ear's physically performing and situational ability to focus mentally, block distractions, internal or external (or both!)

times for best enjoyment, and, that's when subtle changes/improvements/comparisons will be revealed: better/worse/no change.
People are not machines and react differently to their senses over time.   Could just be you which is normal. 
Physical and ear performance have variations, too big differences and you start to worry.
The Keces is amazing. I love it. It improves the sound in every way. Worth waiting for and highly recommended.