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Geothermal Specialist, Inc. has serviced & installed close to 3000 geothermal systems in NW Indiana and SW Michigan since 1983. No one else in NW Indiana has the experience & service you'll find at GSI.

We are a locally owned and operated HVAC company based in Fort Wayne, Indiana, serving all of Allen County with ambitions to expand. We noticed a growing trend of large corporate HVAC firms taking over the space that once was filled by smaller, locally owned companies. Witnessing this, we felt compelled to start our own HVAC company to reinstate the essence of local, personalized, and affordable service. We believe that HVAC service should not just be a transaction, it should be a relationship. Instead of upcharging and taking advantage of customers, our goal is to provide a cost-effective and personal experience. We care about our community and strive to keep your home comfortable at a fair price. Leveraging our extensive experience in trades and HVAC, we guarantee the same level of quality as the large corporations. But unlike them, we are proud to employ local technicians and staff. Living and working in Fort Wayne, we take pride in supporting our local economy. Our manager, brings a wealth of industry experience to our team, having held numerous roles ranging from warehouse manager to operations manager, even general manager at several of the larger corporate firms. Our dedicated team of installers and service technicians are thrilled to be part of our mission. They're eager to build the company they've always wished existed. Our administrative staff, too, is all locally sourced, not outsourced overseas. While we are a small team now, we are committed to growth. We are actively hiring and working with local trade schools to foster career development for our youth and demonstrate that Fort Wayne is a vibrant place to launch a successful career. We hope you will choose our local, employee-owned, reliable, and trustworthy team for your next HVAC service or system installation. Thank you for considering us, and we look forward to serving you.

is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business. is committed to excellence in every aspect of our business. We uphold a standard of integrity bound by fairness, honesty, and personal responsibility. Our distinction is the quality of service we bring to our customers. Accurate knowledge of our trade combined with ability is what makes us true professionals. Above all, we are watchful of our customers' interests and make their concerns the basis of our business.

Mainstream Works will work as an independent contractor for all services performed. With over 30 years of experience in home building, remodeling, landscaping, and construction, Mainstream Works guarantees a successful project.