Get Reliable Heat Back In Your Home
When your furnace stops keeping up, every chilly night feels longer. If rooms are cold, the system is noisy, or your energy bills are climbing, you need clear answers and dependable help. That is where Tri-County Air Service comes in for furnace service Hattiesburg homeowners can count on.
We know how important steady, safe heat is for families in and around Hattiesburg. A furnace problem is more than a nuisance; it affects comfort, sleep, and peace of mind. Our team is here to diagnose the issue, explain your options in plain language, and help you choose what makes the most sense for your home and budget.
Tri-County Air Service has been serving Southern Mississippi since 2005. We started with one service truck and have grown into a trusted regional provider because local homeowners call us back and refer us to friends. We are veteran-owned, and every visit is backed by our 100% satisfaction guarantee.
Ensure reliable heating when you need it most: call Tri-County Air Service or schedule your furnace service online today.
Why Homeowners Choose Our Furnace Team
When you invite a company into your home, you want to feel confident they will do the job right and treat you fairly. Our history in Southern Mississippi and our credentials are all aimed at giving you that confidence. We have been helping homeowners with heating and cooling needs since 2005, and we understand how homes in this region behave when the furnace is struggling.
Over the years, we have grown from a single truck to a well-established team that serves Hattiesburg and the wider Gulf Coast region. That growth did not come from advertising alone. It came from repeat business and referrals. Out of 239 customer reviews, 95 percent are 5-star ratings, and more than 96 percent of our customers say they would recommend us to a friend.
Our technicians hold NATE certification, which is a respected credential in the HVAC field. This means the person working on your furnace has passed rigorous testing in system diagnostics and repair. We pair that training with real-world experience in Southern Mississippi homes, so we can look beyond the obvious and track down the real cause of your heating problem.
Tri-County Air Service is also a Carrier Factory Authorized Dealer. Carrier sets strict standards for dealers, including ongoing training and customer service expectations. This benefits you whether we are making a repair on your current system or helping you consider a new furnace. We can match equipment to your home, climate, and comfort priorities with systems that are built for long-term performance.
We know trust is earned on every visit, not just with credentials. That is why we are proud of our A+ rating with the Better Business Bureau and why we stand behind all our work with a 100% satisfaction guarantee. For new installations, that guarantee goes even further, with an option for a full refund for up to one year from the date of service if you are not delighted with your experience.
Big decisions about your furnace can be stressful, especially when you did not plan for them. To make things easier, we offer free estimates for major work and flexible financial solutions, including 0 percent financing options for qualified projects. Our goal is to make professional heating service accessible without adding financial pressure.
Furnace Problems We Handle Every Day
If something feels off with your furnace, you are not alone. We help homeowners in the Hattiesburg area every day with systems that will not turn on, blow cool air, or heat some rooms but not others. These problems often appear when the weather shifts suddenly, and the furnace is asked to work harder than it has in months.
Some homeowners call us because they hear grinding, banging, or squealing from their furnace cabinet. Others notice short cycling, where the system turns on and off repeatedly without fully warming the home. In many cases, these symptoms can be tied to issues like worn components, airflow restrictions, or thermostat problems that we can diagnose and repair.
Safety concerns are common, especially with gas furnaces. You might notice a gas odor near the unit, see a burner flame that does not look right, or simply worry about carbon monoxide when your system is acting up. Our team treats any safety concern as a priority. We check gas and electrical connections, safety controls, and venting to help ensure your system is operating as it should.
Some homes in and around Hattiesburg rely on electric furnaces or air handlers with electric heat strips instead of gas. We work with those systems as well and understand how electrical issues or undersized wiring can affect performance. Because we also provide electrical and insulation services, we can address contributing factors that may be making your furnace work harder than it needs to.
Our goal in every visit is the same. We aim to identify the real cause of your heating problem, explain what we find, and help you move from frustration to a clear plan. Whether you need simple furnace repair or a more in-depth solution, we work to make the path forward clear and manageable.



