Furnace installation in Birmingham, AL
A new furnace is only as good as its sizing, venting and gas piping. We size it to your home's actual heat loss, vent it to code and set the blower for both heating and the air conditioner it serves.
Furnace installation covers more than swapping a cabinet. Zeltman Heating & Air runs a heat loss calculation, checks the gas line and venting path, matches the furnace blower to your AC coil and sets up the thermostat for single-stage, two-stage or modulating heat. We install gas furnaces where Spire service is available and electric furnaces where it isn't.
Sizing, venting and fuel: what a good furnace install gets right
Birmingham winters are mostly mild, broken up by a few cold snaps that reach the 20s or even the teens. A furnace sized for the coldest night on record will be far too big for the many mild nights in between. We run a Manual J heat loss calculation, so the furnace fits the house instead of a rule of thumb.
Oversized furnaces heat in short, loud bursts, wear out igniters and leave rooms swinging between warm and cool. A two-stage or modulating furnace runs on low most of the time and only ramps up when a cold snap demands it. In this climate that usually means steadier heat and quieter operation. It also starts and stops less often, which is easier on the igniter and the blower motor.
Venting decides which furnace makes sense. A standard 80% furnace vents through metal pipe or a lined chimney. A 90% or higher condensing furnace vents through PVC, often out a side wall, and needs a drain for the water it makes. Older homes with unlined chimneys often need a liner or a switch to sidewall venting.
The furnace blower also moves air for your air conditioner, so it has to match the AC coil and the ducts. Fitting a new furnace to a 12-year-old condenser can work, but sometimes replacing both together is the smarter move. If you'd rather heat with electricity, a heat pump or an electric furnace may suit the house better.
What we check before installing a furnace
- Manual J heat loss for each room, not the size of the old furnace
- Venting path, chimney liner condition or a sidewall PVC route
- Gas line size, shutoff valve, sediment trap and inlet pressure
- Combustion air supply for closet, attic and basement installs
- Condensate drain route and freeze protection for condensing furnaces
- Return air size and filter location for quiet, adequate airflow
- Cabinet width and blower capacity matched to the existing or new AC coil
- Thermostat wiring for two-stage, modulating or dual fuel control
What furnace installation costs in Birmingham
$3,860 to $7,940
A standard single-stage 80% furnace in an easy closet sits near the low end. Condensing, two-stage and modulating furnaces, new venting or attic installs move toward the top. Electric furnaces usually cost less to install but more to run. Each option comes with a written price after the home visit.
Ask for a price (659) 777-4129What moves the number
- Efficiency and staging
- An 80% single-stage furnace costs far less than a 96% modulating model with a variable-speed blower.
- Venting changes
- Switching from a chimney to PVC sidewall venting or adding a chimney liner adds material and labor.
- Location
- Closet installs are simpler than horizontal attic furnaces in two-story homes.
- Gas piping
- An undersized gas line or a missing shutoff and sediment trap gets corrected during the install.
- Matching the AC
- A coil that doesn't fit the new cabinet needs a transition or replacement to keep airflow right.
How a furnace installation day goes
Home visit and calculation
We measure the house, look at the vent and gas routes and talk about comfort issues you've had with the old furnace.
Options and a written price
You get single-stage, two-stage and condensing options where they fit, each with a written price.
Remove and prepare
The old furnace is disconnected and removed, the gas line is capped and the space is cleaned and readied for the new unit.
Install and connect
We set the furnace, connect gas, venting, the drain, duct transitions and wiring, then leak check every gas joint.
Startup and safety tests
Gas pressure, temperature rise, CO and draft are measured, the thermostat is set up and we walk you through registering the manufacturer parts warranty.
When a new furnace makes sense
A furnace past 20 years old
Mild winters let many gas furnaces here pass 20 years. Beyond that point, repairs add up and efficiency trails modern equipment.
A cracked heat exchanger
A crack can let combustion gases mix with house air. On an older furnace, that finding nearly always means replacement.
Repeated ignition or inducer repairs
When the igniter, inducer and board have all been replaced in a few winters, the rest of the furnace is likely close behind.
Replacing your AC at the same time
Doing both together lets the blower, coil and outdoor unit work as one matched system and saves a second setup.
Uneven heat and a loud blower
Rooms that never warm up and a blower that roars on startup can point to an oversized or poorly matched furnace.
Moving from heat strips to gas
Homes with Spire service and electric heat strips sometimes switch to a gas furnace for warmer supply air on the coldest nights.
Furnace installs in Birmingham homes old and new
In Forest Park, where many historic homes still vent through old chimneys, the flue gets a careful look before any new furnace goes in. A condensing furnace venting out a side wall often solves an old chimney problem outright. In postwar Crestwood and Huffman ranches with crawlspace ducts, a closet furnace swap is a routine job.
Hoover, Trussville and Pelham have many two-story homes with a horizontal furnace in the attic for the upstairs. Those installs need a secondary drain pan, a safe service path and venting that runs cleanly through the roof. Where the attic is hard to reach, we plan the carry path and check the pull-down stairs before install day. Trane, Lennox and Rheem furnaces are common in these homes, and we install most major brands.
Areas we cover most often
We repair and replace equipment from these manufacturers, plus most other makes.
Questions about furnace installation in Birmingham
We find out with a Manual J heat loss calculation. Insulation, windows, ductwork and how tight the house is all matter. Many older furnaces here were oversized, so a new one is often smaller than the unit it replaces.
Sometimes. Winters here are mild, so a condensing furnace takes longer to pay back than it would farther north. It often makes sense when venting changes are needed anyway or when you value quieter, steadier two-stage heat.
A like-for-like replacement in a closet usually takes most of a day. Attic installs, venting changes or a furnace and AC replaced together can take two days. We give you the schedule with the written price.
If Spire gas service reaches your street, often yes. It means running a gas line, adding venting and arranging a meter with Spire. We weigh the cost of that gas work against your heating bills before recommending the switch.
Not always. A new furnace can work with an existing air conditioner if the coil fits the cabinet and the system is in good shape. If the AC is 12 or more years old, replacing both together is worth pricing.
Yes. Electric furnaces and air handlers with heat strips are common where gas isn't available. They cost less to install, but in most homes a heat pump heats far more cheaply, so we price both options.
Related services and reading
- Furnace RepairNo heat, clicking with no flame, a tripped limit or a blower that runs nonstop.
- Furnace Tune-UpFall service covering burners, ignition, venting, gas pressure and safety switches.
- Dual Fuel SystemsA heat pump paired with a gas furnace that takes over on the coldest nights.
- Complete HVAC System ReplacementOutdoor unit, indoor unit, coil and controls replaced together as one matched system.
- Heat pump or gas furnace for a Birmingham winter?Heating guide
- What a fall furnace tune-up actually checksHeating guide
Need furnace installation in Birmingham?
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