Professional Affiliations & Certifications | Orland Park, Palos Heights, IL

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Air Conditioning Contractors of America (ACCA)

ACCA is a group of over 4,000 air conditioning contractors who work together to improve our industry, promote good practices, and keep homes and buildings safe, clean and comfortable. ACCA is the largest association of HVACR contractors and the preferred service provider for members in all 50 states and worldwide.

North American Technician Excellence (NATE)

Headquartered in Arlington, VA, NATE was founded in 1997 as the nation’s largest non-profit certification organization for heating, ventilation, air conditioning and refrigeration technicians. NATE tests technicians while others train. Testing validates the technician’s knowledge.

Doornbos is a N.A.T.E. Quality Circle Contractor


Building Performance Institute (BPI)

BPI is an independent, not-for-profit leading developer of technical standards for home performance and weatherization retrofit work that are recognized across North America. From these standards, BPI has developed training programs, professional credentialing for individuals and company accreditations — including quality assurance programs — that help raise the bar in home performance contracting.

Comfort Institute

Comfort Institute, Inc. (CI) is an international indoor comfort research, training and consumer protection organization based in Bellingham, Washington with trainers and offices located throughout the United States and Canada.

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Better Business Bureau- Chicago (BBB)

Doornbos is a member of the Chicago and Northern Illinois Better Business Bureaus. We are proud to maintain an A+ rating.

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Doornbos Heating and Air Conditioning proudly provides HVAC service to CITIES and the surrounding communities. Visit our service area page for more coverage details, call us at 708-423-9580, or request service online today.