I drafted this enchanted device a while back for a lab, using a stand alone building. It could easily be used as +2 Room instead.
Insulation for the Dedicated Lab
Perdo Imagonem 25, R: Touch, D: Sun, T: Structure
This effect stops any sounds from entering or leaving the structure, granting the "Well Insulated" lab virtue (+1 Safety, +1 Aesthetics).
(Base 3 to remove sound, +1 Touch, +2 Sun, +3 Structure)
Device effect total 29 (2 uses per day +1, environmental trigger +3 = constant)