Description Input 115VAC 50/60 Hz, 0.5A. Output 24VAC/50VA (2A) output. Temperature Operating: 0° C to 49° C (32° F to 120° F). Storage: - 20° C to 70° C ( - 4° F to 158° F). BTU/Hr. (approx.): 24 BTU/Hr. Relative Humidity 85% +/- 5% System AC input VA requirement: 57.5VA.