PS Audio PowerPlant P20 better than pure direct AC I get during the night?

Hello,

my system sounds better during the night and it must be related to cleaner AC when factories and offices are closed.

So I'm planning to add a PP P20 to my system in order to standardise the SQ during the 24h. 

However I've a question for you : will a P20 (for my whole system, power amp included) provide a better SQ than the present night-time direct AC?

Thank you!
Gianluca