All 3 dehumidifiers are in excellent condition and have low hours , 1 - 1997 Cargocaire.4500CFM has 3072 hours ,1 - 1997 Cargocaire 4500 CFM has 4026 hours , 1 - 2001 Bry-Air - 5000 CFM has 10000 hours and need 480 volt power source to run each of them. They will take moisture out of large areas and return them to normal conditions.