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On The Mark Heating and Air began with the idea that treating everyone like family was not only the right way but also the responsible way to run a business. Through honesty and integrity, something Mark’s parents instilled in him, Mark quickly built a business that proves when you treat all your customers like family they become clients for life. We are a consistently evolving company listening to our customers and tailoring a dedicated service team to providing the best service in the industry. On The Mark Heating and Air is dedicated to continuing Hvac education to keep up with the latest technology to provide the best possible customer service experience.

Mark Portuese, Owner, On the Mark Heating & Air, grew up in Schaumburg, IL. He comes from a family of both entrepreneurs and tradesmen with various technical backgrounds. Mark always knew he wanted to own his own business and follow in the steps of his family. Taking an interest in mechanics at a young age he was fascinated by how things worked and was always figuring out ways to improve them – which usually meant making them faster or louder! 

Mark graduated from Environmental Technical Institute (ETI) earning his HVAC/R certification. He’s worked for small, family-owned shops and large, industry leaders. Mark has experience in both sides of the trade as a Lead Service Technician and Install Technician.  Along the way, Mark has learned that it is all about the customer experience. Striving to provide his community with an exceptional, unmatched experience, Mark decided to go off on his own and create, On the Mark Heating & Air, a company built with 5 strong core values – Family, We Care, Integrity, Reliability, and Professionalism.

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