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SMACNA of Northern Illinois Northern Illinois Heating Ventilating and Air Conditioning CertifiedContractors SMACNA of Northern Illinois Northern Illinois Heating Ventilating and Air Conditioning CertifiedContractors SMACNA of Northern Illinois Northern Illinois Heating Ventilating and Air Conditioning CertifiedContractors SMACNA of Northern Illinois Northern Illinois Heating Ventilating and Air Conditioning CertifiedContractors Welcome to the Sheet Metal and Air Conditioning Contractors National Association of Northern Illinois SMACNA of Northern Illinois represents Heating Ventilating and Air Conditioning contractors who employ highly trained and skilled craftsmen and craftswomen. Contractors and craftsmen demonstrate their knowledge skill performance and dependability while focusing on maintaining a safe and drugfree workplace. They will respond to your needs promptly and efficiently and provide you with the highest level of service. .