Objective: The present study was aimed at the measurement of the pulmonary function tests in healthy air conditioner users at its comparison with that of non air conditioner(AC) users and at considering whether air conditioner usage affected pulmonary functions. Study method: The study group comprised of 50 healthy males between the ages of 25-50 years, who were working in air conditioned rooms. 50 age and sex matched controls were chosen and their pulmonary functions were compared by using a computerized spirometer, SPIROBANK-G. Results: There was a significant decrease in Forced Expiratory Volume in first second[FEV<inf>1</inf>], Forced Expiratory Flow at 25-75 percent of lung volume [FEF<inf>25-75</inf>], Peak Expiratory Flow Rate [PEFR] and a significant increase in the respiratory rate. Conclusion: There is a significant decrease in the pulmonary functions in air conditioner users. © 2011 Elsevier B.V., All rights reserved.