When your furnace won't light or keeps shutting off, we check combustion and the heat exchanger, measure the real cause, and fix it. Most furnace problems are a low-cost repair — and we'll never invent one to sell a furnace.
Updated June 2026 • Written by the team at Anderson Heating, Air & Insulation, serving Calhoun since 1978 🐾
Most furnace problems in Calhoun are a low-cost repair — a worn ignitor, a dirty flame sensor, a clogged filter starving airflow, or a failed capacitor. The one problem you don't ignore is a cracked heat exchanger, which can leak combustion gases — so we check combustion and the heat exchanger on every furnace diagnosis. We diagnose by measurement (temperature rise, airflow, combustion), repair first, and only recommend replacement when the numbers say so — never to make a sale.
A gas furnace lights a burner, heats a metal heat exchanger, and the blower pushes your home's air across that hot metal and out the ducts. The combustion gases stay sealed inside the heat exchanger and vent outside; your indoor air never touches them — as long as the heat exchanger is intact. When a furnace 'breaks,' it's usually one small step in that chain failing, not the whole machine.
The cracked heat exchanger is the furnace problem that matters most, because it can let combustion gases mix with the air you breathe. We inspect the heat exchanger and check combustion as part of any furnace diagnosis. If we find a real crack, we'll tell you plainly and we won't let the furnace keep running unsafely. And just as importantly: we will never invent a cracked heat exchanger to sell you a furnace. Because we measure, we can show you exactly what we found.
Anderson is a building-science company serving Calhoun since 1978. We run six blower doors and six duct blasters and treat your home as one system. That means when a furnace short-cycles, we can tell whether it's a dirty flame sensor, a starved-airflow problem from leaky or undersized ducts, or an oversized furnace satisfying the thermostat too fast — and fix the actual cause. We repair first and replace only when the measurements say a repair won't last or won't pay off.
We'll find the real cause, check it's safe, and quote the actual repair before any work — no scare tactics.
Call (706) 629-0749A cracked ignitor that won't light, a dirty flame sensor shutting the burner off on safety, a clogged filter starving airflow and tripping the high-limit, a failed capacitor or blower, and gas-valve/control faults. Most are low-cost repairs. We measure temperature rise and airflow and inspect the burner instead of guessing.
Warning signs are soot, a persistent burning smell, frequent safety lockouts, or visible cracks on inspection. We inspect the heat exchanger and check combustion as part of a furnace diagnosis. If we find a true crack we'll tell you plainly and won't let it keep running — and we never invent one to sell a furnace.
It depends on the numbers, not the calendar. A 12-year-old furnace with a bad ignitor is a cheap repair; one with a cracked heat exchanger or failed gas valve on a badly mismatched system may be better replaced. We repair first and show you the measurements and math behind any replace recommendation.
Short-cycling usually means the furnace is protecting itself — a dirty flame sensor, a clogged filter or restricted airflow tripping the high-limit, an oversized furnace, or a venting issue. We measure temperature rise and airflow and check the venting to find which one it is.