Why Does My Air Conditioner Smell? 8 Common Causes & What You Can Do Noticing a strange smell coming from your air conditioner? Whether it’s musty, chemical, or something worse, an unpleasant odor from your AC isn’t just annoying—it could be a warning sign that something’s wrong with your system. In this blog, we’ll break … [Read More]

10 Commercial HVAC Tips All The Pros Should Know Welcome to On The Mark, the leading commercial HVAC maintenance and installation company in Schaumburg, IL. Proper maintenance of your HVAC system ensures it runs efficiently, saves energy, and extends its lifespan. Call us today for a free commercial HVAC consultation, or keep reading to learn … [Read More]

The year 2023 was a year filled with plenty of new adventures, opportunities, and growth for our team. Let’s take a trip down memory lane and relive the highlights of the past year. January We started the year strong by refreshing our website design. The goal was to create a cleaner, simpler look that better … [Read More]

Daikin and On The Mark Heating and Air Support Hoffman Estates Family in Need We are thrilled to share a special collaboration with Daikin Comfort Technologies to bring warmth and comfort to a truly deserving family in Hoffman Estates, IL! Mark Portuese, Owner of On The Mark Heating and Air met Mitzi and her resilient … [Read More]