Size Heating and Cooling Right First
Measured installations backed by 37 years serving Michiana
Gnoth and Lukowski Heating and Air has delivered HVAC installation, repair, and maintenance to Mishawaka and surrounding Michiana communities for 37 years. Every job begins with load calculation before install and static pressure testing—two engineering steps that separate efficient systems from the energy-wasting shortcuts other installers skip. Cold winters and freeze-thaw cycles demand furnace systems sized correctly to avoid continuous cycling and premature failure, while humid summers require air conditioning units matched to home cooling load to prevent inadequate cooling when temperatures spike.
You're not looking for the fastest install—you need equipment that performs reliably when Michiana weather extremes hit. Undersized furnaces run constantly and burn out early; oversized air conditioners cycle inefficiently and leave humidity unchecked. The calculations we run at the start determine whether your system delivers comfort or disappoints you every season.
Gnoth and Lukowski Heating and Air brings technical accuracy and practical solutions to every installation, repair, and service call. Our family-owned and operated approach focuses on getting the engineering right so your equipment lasts and your energy costs stay predictable.
Freeze-cycle protection starts with correctly sized furnaces calculated to your home's specific load, preventing continuous cycling and early equipment failure.
Same-day parts availability means your repair doesn't wait for ordering delays when temperatures drop or spike.
Routine static pressure testing identifies ductwork issues before they drive up utility bills or strain your system during peak demand.
Units matched to your home's cooling load deliver efficient performance during humid Michiana summers without wasting energy or leaving rooms warm.
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How We Deliver Reliable Service
Our 4-person team carries parts on every truck, enabling same-day installation and repair for Mishawaka, South Bend, Granger, and surrounding areas. You'll know what to expect before work begins: we provide free estimates, explain the load and pressure readings that guide equipment selection, and complete the job without waiting on back-ordered components. NATE-certified technicians handle furnace installation, air conditioning installation, water heater replacement, ductwork installation, thermostat installation and replacement, and humidifier service and installation with the same engineering discipline.
Transparency starts with showing you the numbers. Static pressure testing reveals whether your ductwork restricts airflow, and load calculation confirms whether your current system matches your home's square footage, insulation, and window exposure. When you understand the technical reasons behind our recommendations, the path forward becomes clear.
Here's what sets our installations and repairs apart:
Load calculation and static pressure testing completed before equipment selection, ensuring your furnace and air conditioner match your home's actual demand
NATE-certified technicians who apply engineering standards to every installation and repair, not just the minimum code requirements
Same-day parts availability that eliminates delays when your system fails during a cold snap or heat wave
Freeze-cycle protection built into every furnace recommendation, so your system handles Michiana's harshest winter conditions without continuous cycling
Schedule your free estimate and we'll walk you through the load calculation and pressure testing process that guides every recommendation.
Susan Hindlsey
Just had a 50 gallon water heater out in. First is the friendly people there. From the owner Scott Lukowski to the workers. The job was done in a timely fashion. No surprise charges. Great place for your furnace and A/C work too!
Grecia R
Scott was very helpful with our issue and he promptly fixed it. Back in December he also installed a new furnace and gave us a great price. He doesn’t try to sell you anything you don’t need and he even threw in a free thermostat. We are so happy we found this company.
Amanda Pletcher
Called at 7:09am and left a message about our AC not working correctly. Scott contacted me shortly after and came out the same day. Quick and professional services with reasonable rates. Best of all our A/C is operational again on one of the hottest days of the year.
Julie Hardy
Gnoth and Lukowski does a great job and finding the issue and addressing it. I called them on a Monday and they were out early on Tuesday morning to fix my furnace. I never feel pressured to buy an entire new furnace like a lot of other local companies do. Gnoth and Lukowski is amazing!
Susan Hindlsey
Just had a 50 gallon water heater out in. First is the friendly people there. From the owner Scott Lukowski to the workers. The job was done in a timely fashion. No surprise charges. Great place for your furnace and A/C work too!
Grecia R
Scott was very helpful with our issue and he promptly fixed it. Back in December he also installed a new furnace and gave us a great price. He doesn’t try to sell you anything you don’t need and he even threw in a free thermostat. We are so happy we found this company.
Carol Thompson
Awesome service! Just a wire came off and fixed it with no charge. Great way to take care of your customers.
Springwise Facility Management
Had an issue with one of our critical HVAC units at our data center. Scott said he could be out the next morning and was there promptly and had the unit up and running again within minutes of working on the problem.
Papa Geren
Gnoth and Lukowski has serviced our business for years; since back in the Gnoth and Naragon days. Scott really knows his stuff! It's nice to do work with a business where you have direct access to the owner. The service is beyond my expectation. You can trust Gnoth and Lukowski for all of your heating and cooling needs!
Jeannie Bunnell
Thanks Scott for the maintenance on our furnace. See you in April for the air conditioner maintenance. You’re keeping our HVAC system in tip top shape!!!
Carol Thompson
Awesome service! Just a wire came off and fixed it with no charge. Great way to take care of your customers.
Springwise Facility Management
Had an issue with one of our critical HVAC units at our data center. Scott said he could be out the next morning and was there promptly and had the unit up and running again within minutes of working on the problem.
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Competence Built Over Decades
Gnoth and Lukowski Heating and Air has served the Michiana region for 37 years because we focus on technical accuracy over hype. Licensed and insured, we offer senior discounts and military discounts to the families and veterans who've built this community. Every installation reflects the engineering discipline that prevents callbacks and keeps systems running efficiently season after season.
You deserve a contractor who sizes equipment correctly, tests ductwork performance, and stands behind the work with real accountability. Our family-owned and operated team brings the same practical, no-nonsense approach to every job—whether it's a furnace repair on a January night or an air conditioning install before summer heat arrives. We've built our reputation on doing the engineering work that others skip, and that commitment shows in system longevity and customer comfort.
Reach out today for your free estimate and experience the difference that load calculation and static pressure testing make in long-term system performance.
