On the Mark Heating & Air is the heating and cooling company to call when you want fast, friendly and skilled HVAC contractors in Schaumburg, IL or the surrounding area. We offer a complete line of expert heating, air conditioning, furnace repair, and indoor air quality services that you won’t find anywhere else.
When you need help with HVAC in Schaumburg, our technicians are simply the best. They are highly-trained, certified, and they participate in continuing education classes frequently. They will arrive on time, keep your home clean, and communicate clearly with you throughout your Schaumburg HVAC service process.
Enjoy $35 off any service of your choice when you spend $250 or more!
Call today!
Hear from your neighbors about our heating, cooling and indoor air quality services in Schaumburg, IL.
Our founder, Mark Portuese, recently joined Home Answers Radio to cut through the noise around HVAC replacements. Instead of talking brands and buzzwords, he focused on what actually makes homes comfortable: proper system sizing, real load calculations, and why most systems are installed wrong the first time. It’s straight-talk advice homeowners rarely hear—but absolutely need before making a major investment.
See how we’re sharing our expertise and giving back to the community.
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When your AC stops keeping up, your furnace starts making a new noise, or your system ices over out of nowhere, something’s off. Catching it early almost always means a simpler, less expensive fix. Most of the calls we get aren’t catastrophic. They’re systems that needed attention before they became a real problem.
Whether it’s a heating system struggling through a cold snap or an AC running constantly without actually cooling your home, our techs diagnose it fast and give you a clear & straight answer on what it’ll take to fix it.
Call us for a transparent estimate today!
It can be hard to know who to trust, but it shouldn’t be. That’s why we take the time to understand your worries. We are always transparent and honest with our pricing and solutions and are proud to serve our community as a family-owned and operated company. Have questions? Call us anytime!
Most HVAC companies are done the moment they pack up their tools. We think that’s the wrong approach. Every repair we do is backed by a real warranty, and if something goes wrong after we’ve been there, we come back and make it right. That’s true whether you’re a first-time customer or you’ve been with us for years. The warranty isn’t fine print. It’s how we do business.
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It doesn’t matter if your system is brand new or has been running since the ’90s. Our techs work on every major HVAC brand: Carrier, Trane, Lennox, Rheem, Goodman, and everything in between. That’s partly because we hire experienced technicians, and partly because every one of our techs is NATE-certified.
NATE stands for North American Technician Excellence. It’s the HVAC industry’s most recognized certification, and earning it means passing rigorous exams that prove real working knowledge of heating and cooling systems. When a NATE-certified tech tells you what’s wrong with your system, you can trust that answer.
On the Mark was built by people who live and work in this community. Mark and the team show up at local events, sponsor the organizations that matter here, and have been taking care of the same families (sometimes across generations!) for years. That’s not something you find at a big box HVAC company.
When you call On the Mark, you’re not a ticket number. You’re a neighbor.
Why OTM?
Call (847) 630-9562 
