In effect when I lived in Kentucky and run the heater 24/7 in winter my avian vet there suggested that along with showers I purchase a humidifier and ran it in the same room that the birds were in, which was the living room. This would not only help the birds (2 CAG`s at that time) but the rest of us as well. To a lesser degree it did. Lately hope this helps.
Chirps, barks and meows, Birt (Double Yellow-headsed Amazon) http://www.prodigyweb.net.mx/lidemi/Birt/Birt.html Rapture (German Shepherd Dog) Rigel (San Francisco Alley Cat)