How does low humidity/static affect your sound?

I have a good friend who lives in an apartment building.He has a fabulous system,consisting of Magico Minis/Rowland/Audio Res/SOTA table/Graham arm/Transfig Orpheus Cartridge/and Levinson CD player.All connected to superb line conditioning.Great stuff!
Here is the problem,which he is very defensive about,but I and others truly want to aid him,and find a solution to......
His winter humidity used to go down to about 20- 25%.Now he has added a very good(cold air)humidifier,which runs absolutely silent,but he cannot get humidity to "consistently" stay above 40%.This humidifier cost him a few hundred dollars.He seems to be SO used to the particular sound of his environment that he most likely doesn't realize how much better his system can sound.BTW,it is not "poor",but I know it can sound much better,as are the sentiments of our audio group.
The system always sounds better in spring/summer,when humidity is non problematic,yet "now" there is ALWAYS a build up of ststic/dust around his cartridge,and he has all sorts of accessories to help this problem....Yet,even with his older speakers,the "winter sound" of his componentry is almost the same flavor,even with the previous speakers.Same sonic flavor!!...Dry and thinning sounding,even though there is very good detail.We'd like to get back to the warm textured harmonic presentation that he has in better seasonal weather.
I believe that if he were to add(along with his current silent humidifier)a good digital "warm mist" unit,like a digital Honeywell design(only costing about 70 bucks)his problem would go away.
Then,the constant safe humidity of 40-60%,should be attainable,with both units on....He is a hard sell!!!
Any additional thoughts are welcome!
Thanks.