Furnace Repair & Replacement in Decatur, AL

Furnace Repair You Can Trust in Decatur, AL

North Alabama winters are mild until they are not, and a furnace that quits on a cold night needs a straight answer fast. Southeastern Mechanical Services is a family-owned, husband-and-wife HVAC company in Decatur. Our technicians are trained service techs, not commissioned salespeople.

We repair, replace, and install gas furnaces and heating systems. We find the problem, explain it in plain terms, and give you repair options before we ever talk about replacement. Call 256-686-3444. Our phones are answered live, 24 hours a day, 7 days a week.

Furnace Not Heating? Check These First

The thermostat is set to Heat and above the room temperature. If the display is blank, replace the batteries.
The air filter is not clogged. A dirty filter can make the furnace overheat and shut itself off.
The furnace power switch, which often looks like a light switch near the unit, is on, and the breaker is not tripped.
The furnace door panel is closed tight. Many furnaces will not run with the panel loose.

If you smell gas, leave the house right away and call your gas company from outside. Then call us.

Common Heating Problems We Repair

Ignition and flame sensor trouble

If the furnace tries to start and shuts off, or never lights at all, the igniter, flame sensor, or control board is a common cause. These are often straightforward repairs.

Poor or uneven airflow

Cold rooms and weak airflow usually point to a clogged filter, blocked returns, duct problems, or a struggling blower. We find where the air is going and fix the cause.

Thermostat problems

A failing or miswired thermostat can make a good furnace look broken. We check the thermostat and its wiring before we ever condemn the equipment.

Blower motor problems

Noisy, slow, or dead blower motors are a common winter call. If your system is still under its parts warranty, the motor itself may be covered.

Short cycling

A furnace that turns on and off every few minutes wastes energy and wears out parts. Overheating, a dirty flame sensor, or an oversized system can all cause it.

Safety concerns

A gas furnace should vent its exhaust safely outside. We check burners, flues, and venting, and we recommend a working carbon monoxide detector in every home with gas heat.

Repair or Replace?

Not every broken furnace needs to be replaced. If a repair makes sense, we will tell you so. If the system is near the end of its life or the repair does not add up, we will explain why and give you a written quote that shows exactly what would be installed. You are always welcome to get a second opinion.

When you do need a new furnace, we size it to your home and handle the installation from start to finish. On York equipment, the 10-year parts warranty requires registration within 60 days of installation. We register it for you, so your coverage is locked in.

SMS technician going over options with a homeowner

Heat pumps

Many homes here heat with a heat pump instead of gas. See our heat pump services for repair and installation.

Fall tune-ups

Our spring and fall maintenance visits check burners, flues, electrical connections, and your carbon monoxide detector before the first cold snap. No contract required.

Commercial heating

We also service heating for businesses, from rooftop units to production spaces. See commercial and industrial HVAC.

Furnace Repair Questions

Why does my furnace turn on and then shut off?

Common causes include a dirty flame sensor, a failing igniter, a clogged filter that makes the furnace overheat, or a control board problem. A technician can test each one and tell you which part has failed.

Should I repair or replace my furnace?

If the furnace still has years of life left and the problem is a part that can be replaced, repair usually makes sense. We give you repair options first. If replacement is the better choice, we explain why and give you a written quote that shows exactly what would be installed.

What should I do if I smell gas?

Leave the house right away and call your gas company from outside. Do not switch lights or appliances on or off. Once the gas company says it is safe, call us to inspect the furnace.

How often should a furnace be serviced?

Once a year, ideally in the fall before the heating season. Our fall maintenance visits check burners, flues, electrical connections, and your carbon monoxide detector. No contract required.

Where We Repair Furnaces

Decatur is our home base. We also serve Hartselle, Priceville, Trinity, Somerville, Austinville, Eva, Athens and all of Limestone County, Cullman, and the Smith Lake area. See our full service area. For cooling, see AC repair in Decatur.