Top-rated independent heating and cooling across north Georgia and the southern Appalachians
Furnace Installation in Lithonia, GA — Book a Visit Today
A furnace that needs a part every winter and rumbles on startup is nearing the end. We handle furnace installation in Lithonia for gas and electric systems, including changeovers where the ductwork was never sized for the new blower. Before quoting we look at the flue, the return path and the crawlspace runs, because a good furnace on bad duct still leaves cold back bedrooms. If you smell gas at any point, get everyone outside, call 911 or the gas utility, then call us. Otherwise send the quote form or call and we will schedule a look at the house.
Call (888) 878-4879- Real people on the phone
- 7 days a week
- Quote in writing before any work
Taking calls until 5:00 PM ET
Common furnace installation faults in Lithonia homes
- The furnace runs all evening and the back bedrooms never warm up Undersized or poorly ducted system, or a unit past its useful output
- We have had heating repair out three winters running Repeat failures on an aging heat exchanger, board or inducer motor
- It kicks on, runs two minutes, shuts off, then does it again Short cycling from oversizing, restricted return air or a failing limit switch
- There is a burnt or sooty smell when the heat starts Combustion or heat exchanger problem that needs inspection before any replacement talk
- Parts for our furnace are on backorder every time Obsolete equipment where replacement costs less over the season than another furnace repair
Whether you call it furnace installation, furnace replacement or heater installation, the work is identical and so is the quote you approve first.
Lithonia coverage
From Lithonia we also cover Stonecrest, Conyers, Snellville, Lilburn, Decatur, Stone Mountain and Loganville.
Other repairs we do in Lithonia
- AC Repair
- Furnace Repair
- Heat Pump Repair
- AC Installation
- Ductwork Repair
- HVAC Maintenance
- Duct Cleaning
- Thermostat Installation
- Mini-Split Repair
- Indoor Air Quality
Furnace Installation service hub → · Lithonia service directory →
Guides & troubleshooting
Independent HVAC company vs the big names in Lithonia
| STM Heating & Air | Big-box repair chains | Handyman listings | |
|---|---|---|---|
| Quote in writing before a wrench comes out | ✓ | ✕ | ✕ |
| Phones answered by people, every day | ✓ | ✕ | ✓ |
| All major brands, gas and electric | ✓ | ✓ | ✕ |
| Independent company, nobody's quota | ✓ | ✕ | ✓ |
| Crews familiar with homes like yours | ✓ | ✕ | ✓ |
The same on every visit
The quote comes first, in writing
Covering 81 cities across Alabama, Georgia, Kentucky and 3 more.Phones answered by people
Open 7 days, 8:00 AM to 5:00 PM ET.Every major brand, gas and electric
Carrier, Trane, Lennox, Goodman and more. We are not an authorized dealer for any of them.Furnace Installation in Lithonia — quick answers
How do you decide what size furnace my house needs?
We measure the house rather than match the old nameplate. Square footage, insulation, window count, duct layout and how the house sits on the ridge all change the BTU load. Oversized furnaces short cycle and leave rooms uneven, so we size to the actual heat loss.
Should I repair my furnace or replace it?
If the heat exchanger is cracked, or the part is obsolete, or you have paid for heater repair two or three winters in a row on a unit well past its expected life, replacement usually makes more sense. We give you both numbers and let you decide.
How long does a furnace installation take?
Most straight swaps take a day. If we need to correct venting, resize a return, run new gas line or move the unit in a tight crawlspace, plan on two. We tell you which one you are before we start, not after.
What is a high-efficiency upgrade actually changing?
A high-efficiency furnace uses a sealed combustion process and PVC venting instead of a metal flue, plus a variable or multi-stage blower. That means new vent routing and a condensate drain. We check both are workable at your house before quoting the upgrade.
How soon can you get to a house in Lithonia?
Most Lithonia calls get a same day or next day visit, and we are honest with you on the phone about which one it is. Summer afternoons book up fast once the heat sets in, so calling early in the day helps. Tell us what the system is doing, whether the outdoor unit is running and whether the air at the vents is warm, and we will bring the likely parts with us.
How it works
- Step 1
Tell us the symptom
Call or fill in the quote form and describe what you hear, smell or feel. Warm air, short cycling, a breaker that keeps tripping. That gives us a head start on the likely cause.
- Step 2
We diagnose on site
A technician checks the thermostat, airflow, electrical connections, refrigerant performance and the outdoor unit. We work the crawlspace and the attic too, because ductwork and drainage cause more trouble than people expect.
- Step 3
You decide, then we fix it
We explain what failed, what it takes to repair it, and what we would watch next season. No work starts until you say go. Most repairs finish the same visit when parts are on the truck.
- A real person answers
- Open 7 days
- Written quote before work starts
Why homeowners call us
- Mixed heating is normal to usHeat pumps, propane furnaces and dual-fuel setups all behave differently in cold weather. We know how a heat pump should sound in the thirties and when the backup heat is doing too much of the work.
- We go under the houseRed clay crawlspaces hide crushed ducts, sweating lines and standing water. Comfort problems often start down there, not at the unit, so we look before we start replacing parts you may not need.
- Plain explanationsYou get told what broke and why, in words that make sense. If a repair is a short-term patch on an aging system, we say that out loud so you can plan instead of guessing.
- One crew, six statesWe serve homeowners across Alabama, Georgia, Kentucky, North Carolina, South Carolina and Tennessee. Same approach in every one: show up, diagnose properly, repair what needs repairing, leave the space clean.
- All major brands, gas & electricOne independent crew for Carrier, Trane, Lennox, Goodman, Rheem and more.
- Straight answersNot worth fixing? We say that out loud, and often it saves you the visit fee.
Furnace Installation in Lithonia
The longer it sits broken, the more it takes from you
Tell us the symptom, sign off on the written quote, get the machine back. Starting takes a minute.
- A real person answers
- Open 7 days
- Written quotes
- All major brands
- Gas & electric
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