Furnace Buying Guide 2026: Goodman, Lennox, York, Trane and Carrier Compared

A furnace is the single most expensive appliance in most American homes, and the name stamped on the cabinet quietly decides three things people don't think about at the sales counter: which parts are stocked in your city, how long the warranty actually covers, and how quiet the heater runs at 3 a.m. in January.

The quick answer: the five brands that show up on almost every 2026 quote — Goodman, Lennox, York, Trane, and Carrier — are all fine equipment. They differ on price tier, warranty structure, efficiency ceiling, and how deep the local dealer bench is. This guide walks through how a furnace actually works, how to size one for your house, what AFUE efficiency tiers mean, and how the five brands stack up before you hand over $5,000–$12,000 for a replacement.

Furnace vs. heater vs. air conditioner — the terminology fixed

Three words that get thrown around like they mean the same thing:

Heater is the umbrella term for anything that produces heat — a wall unit, a baseboard, a furnace, a heat pump, a boiler. When someone says “my heater's broken,” step one is asking which kind.

Furnace is a specific kind of heater: a forced-air appliance that burns fuel (natural gas, propane, oil) or uses electric resistance elements to heat air, then pushes that heated air through your ductwork with a blower. This is what the majority of U.S. homes use to heat.

Air conditioner is the cooling side. In a typical split system, the air conditioner is the outdoor condenser plus an indoor evaporator coil that sits on top of the furnace, sharing the same blower and ductwork. The furnace runs in winter, the air conditioner runs in summer, and the blower runs whenever either one is calling.

That shared blower is why the furnace and air conditioner are almost always sold and installed as a matched pair. A new furnace with an old, mismatched AC coil is a service call waiting to happen.

Furnace types, in one paragraph each

Natural-gas furnace. The default in most of the country where a gas main runs down the street. Cheap fuel, mature technology, 80–99% AFUE efficiency range. Requires a vent to the outside (metal flue on 80% units, PVC on high-efficiency 90%+ units).

Propane furnace. Same architecture as gas, different fuel — used in rural areas without a gas main. The furnace itself is often the same model with a different orifice; the difference is the tank in your yard and the fuel delivery contract.

Oil furnace. Still common in the Northeast. Higher operating cost than gas in most markets, but a viable option where gas isn't available and winters are hard. Fewer 2026 model options than gas — the market is contracting.

Electric furnace. Resistance-coil heating with a blower. Cheap to buy, expensive to run in cold climates. Increasingly displaced by heat pumps, which move heat rather than generate it and cost roughly a third as much to operate.

Most of what follows in this guide is about the gas furnace, because that's what the five big brands compete hardest on.

AFUE: what the efficiency number means

AFUE stands for Annual Fuel Utilization Efficiency. A 96% AFUE furnace turns $96 of every $100 in gas into usable heat inside your house; the other $4 goes up the flue. The higher the number, the more of your fuel bill becomes warm rooms.

The current U.S. federal minimum is 80% AFUE for gas furnaces. The market splits into three practical tiers:

80% AFUE (mid-efficiency). Single-stage burner, metal flue, lowest install cost. Fine for mild climates or short heating seasons. Ruled out in some cold-climate jurisdictions that require 90%+ on new installs.

90–96% AFUE (high-efficiency). Two-stage burners common at this tier, PVC condensing vent (the furnace pulls extra heat out of the exhaust and drains condensate). This is the sweet spot in most of the northern half of the U.S., and it's where most rebates live.

97–99% AFUE (ultra-high). Modulating gas valve, variable-speed blower, best quiet-running performance. Lennox's SLP99V hits 99% AFUE, and comparable top-shelf models from Carrier (Infinity 98) and Trane (S9V2) sit in the same tier. Payback period depends on how long you'll stay in the house and how cold your winters are.

The rule of thumb: south of I-70, an 80% or low-90% furnace is usually right. North of I-70, the 90–96% tier is the default. In genuine cold country (Minnesota, Wisconsin, upstate New York) a 97%+ modulating furnace pays back inside a decade for anyone staying put.

Sizing: the number that matters most

An oversized furnace is a worse mistake than an undersized one. Oversized furnaces short-cycle — they heat the space fast, shut off, cool down, restart — which wears out the ignition components, wastes fuel, and leaves cold spots because the blower never ran long enough to mix the air. Yet oversizing is the most common installer error in the industry.

The right way to size a furnace is a Manual J load calculation, run by the installer with software that accounts for your square footage, insulation, window area, orientation, and local design temperature. Any contractor who quotes a furnace size by walking through the house and eyeballing it is guessing.

The rule-of-thumb starting point looks like this:

• Zones 1–2 (hot South): 30–35 BTU per square foot
• Zone 3 (warm): 35–40 BTU/sq ft
• Zone 4 (mixed): 40–45 BTU/sq ft
• Zone 5 (cool): 45–50 BTU/sq ft
• Zones 6–7 (cold): 50–60 BTU/sq ft

A 2,000 sq ft home in Zone 5 lands at roughly 90,000 BTU/hr — a 90k or 100k input furnace at ~95% AFUE. Use those numbers to sanity-check a Manual J. Never use them to skip one.

The five major furnace brands, compared

Every quote you get in 2026 will lead with one or two of these five names. The engineering differences between them are smaller than the marketing suggests. The real differences are ownership structure, dealer network, warranty terms, and price tier.

Goodman

Owned by: Daikin (largest HVAC manufacturer in the world). Positioning: value. Warranty: 10-year parts on registered units, lifetime heat exchanger on select models.

Goodman is the highest-volume residential furnace brand in the U.S. for one simple reason: the best $/BTU on the market, backed by a warranty that outmatches most premium brands on paper. The equipment is fine — Daikin's engineering, Texas-built cabinets, industry-standard components inside. The knock has always been noise (the mid-tier furnaces are louder than a Lennox at the same efficiency) and less flashy communicating-thermostat integration than Carrier or Trane.

Buy a Goodman if you want a solid furnace at the best price and don't care about smart-thermostat integration or the badge on the cabinet.

Lennox

Owned by: Lennox International (independent). Positioning: premium. Warranty: 10-year parts, 20-year or lifetime heat exchanger on top models.

Lennox owns the top of the efficiency chart. The SLP99V is the highest-AFUE gas furnace on the U.S. market at 99% AFUE, and Lennox's modulating gas valve technology is genuinely a step above what Carrier and Trane offer at the same tier. The catch: Lennox is dealer-locked. Parts and replacement components are only sold through authorized Lennox dealers, which means service calls in some regions have fewer competing quotes than a Goodman or Carrier install.

Buy a Lennox if you're in a cold climate, staying in the house 10+ years, and there's a reputable Lennox dealer within an hour of you.

York

Owned by: Johnson Controls. Positioning: mid-market. Warranty: 10-year parts, lifetime heat exchanger on select models.

York sits between Goodman's value pricing and Lennox's premium tier, with a strong commercial-HVAC parentage that shows in build quality. The Affinity series (branded YP9C for the top furnace) tops out at 98% AFUE with modulating burners and matches the premium brands on paper for less money. York's dealer network is smaller than Carrier's but larger than Lennox's in most metros.

Buy a York if you want premium build at mid-market pricing and there's a Johnson Controls dealer nearby.

Trane

Owned by: Trane Technologies. Positioning: premium. Warranty: 10-year parts, lifetime limited heat exchanger on select models (registered on time).

Trane's reputation is reliability. The heat exchangers are heavier-gauge than most competitors, the cabinets are stiffer, and the failure rates in industry surveys are consistently among the lowest. Efficiency ceiling is a hair lower than Lennox at the very top — Trane's S9V2 tops out at 97.3% AFUE — but the reliability premium is what people are actually paying for. Wide dealer network everywhere in the U.S. except the most rural markets.

Buy a Trane if you value long-life equipment over ultra-high efficiency, and expect to hold onto the house for 15+ years.

Carrier

Owned by: Carrier Global. Positioning: premium. Warranty: 10-year parts, lifetime heat exchanger on select models.

Carrier invented modern air conditioning and has the largest premium HVAC dealer network in the U.S. The Infinity 98 furnace hits 98.5% AFUE with a modulating gas valve, and Carrier's communicating Infinity thermostat integration is the best in the industry — the furnace, air conditioner, and thermostat talk to each other in a way that unlocks real efficiency gains. Pricing sits alongside Trane and Lennox at the top of the market.

Buy a Carrier if you want the deepest dealer network, tight thermostat/system integration, and don't mind paying premium pricing for it.

Furnace + air conditioner as a matched system

Almost nobody buys just a furnace. If yours is 15 years old, the air conditioner sitting on top of it is probably close to end of life too, and the AC coil that pairs with the furnace has to be sized correctly for the blower and refrigerant charge on the new AC.

Replace them together and three things get easier:

• Manufacturer warranties align — the same 10-year parts window on both units, registered at the same time
• The blower CFM is matched to the AC tonnage from day one, so airflow across the coil is right and the AC actually hits its rated SEER2
• Rebates and financing packages are almost always structured around the pair, not the individual unit

The exception: if the AC is genuinely young (under 8 years) and running well, keep it and just replace the furnace. Any decent contractor will confirm the coil is compatible with the new blower before writing the quote.

What a full furnace install actually costs in 2026

Installed pricing varies more by market than by brand. Rough 2026 ranges for a straight replacement (same fuel, same location, no ductwork changes) on a 2,000–2,500 sq ft home:

• 80% AFUE gas furnace (Goodman value tier): $3,500–$5,500 installed
• 95% AFUE gas furnace (mid-tier from any brand): $5,500–$8,500 installed
• 97–99% AFUE modulating (Lennox SLP99V, Carrier Infinity 98, Trane S9V2): $8,500–$13,000 installed

Full system replacement (furnace + AC + coil + thermostat) at the mid-tier runs $9,000–$15,000 in most metros; at the premium tier, $14,000–$22,000. New ductwork, gas line changes, or venting relocation add on top.

Federal and state rebates can knock $600–$2,500 off a high-efficiency furnace install — the ENERGY STAR tax credit covers 30% of the cost of qualifying gas furnaces up to $600, and utility rebates in many states stack on top.

The four questions that actually matter at quote time

Get all four in writing from every contractor bidding your job:

1. What Manual J load did you calculate? A real number, not a wave at the square footage. If they can't show you the calc, they didn't do one.

2. What's the matched AC coil model number? Even if you're only replacing the furnace, the coil compatibility has to be confirmed. The model number goes on the quote.

3. What's the warranty term, and who registers it? The manufacturer parts warranty only activates on time when the installer registers the equipment. Ask who does it and when — usually within 60 days.

4. Is the permit pulled by you or by me? Any furnace install requires a mechanical permit in almost every U.S. jurisdiction. The installer pulls it in their name. If they suggest skipping the permit to save money, hire someone else.

Frequently asked questions

How long does a furnace last? A well-maintained gas furnace lasts 15–20 years. Skipping annual service knocks that down to 10–12. The heat exchanger — the most expensive component — is what usually goes first, which is why the lifetime heat exchanger warranty on Trane, Lennox, and Carrier top models matters.

Should I replace my furnace and air conditioner at the same time? If both are 12+ years old, yes — the labor overlaps, the warranties align, and the coil sizing works out cleanly. If your AC is under 8 years, replace just the furnace and confirm coil compatibility.

Is a heat pump better than a furnace? In climates that stay above roughly 20°F most of the winter, a modern heat pump beats a gas furnace on operating cost and does cooling at the same time. In genuine cold country (Zones 6–7), a dual-fuel setup (heat pump + gas furnace backup) usually wins on total cost.

Which brand has the best warranty? All five brands offer 10-year parts warranties when registered on time. Trane, Lennox, and Carrier extend to lifetime limited heat exchanger warranties on select premium models; Goodman does the same on select models at a lower price point.

Can I install a furnace myself? No. Gas connections, venting, condensate handling, and the electrical circuit all require licensed contractors in almost every U.S. jurisdiction. Even in states that allow homeowner mechanical work, the permit inspection will fail without documentation. Unlike a mini split, a furnace is not a DIY appliance.

What's the difference between one-stage, two-stage, and modulating furnaces? One-stage runs at 100% output whenever it's on. Two-stage has a low fire (~65%) and a high fire, so most of the season it runs quieter and holds temperature better. Modulating varies output continuously from ~35% to 100% based on demand — the quietest, most even heat, and the highest efficiency, but the most expensive to buy.

Do I need a variable-speed blower? A variable-speed blower ECM motor uses about a third of the electricity of a fixed-speed blower and gives you much better summer dehumidification when the AC is running. On any furnace above the entry tier it's worth the upcharge.

Buying from HVACMORE

HVACMORE carries all five major brands — Goodman, Lennox, York, Trane, and Carrier furnaces — and the matched air conditioner coils, condensers, thermostats, and accessories that turn a boxed furnace into a finished install. Ordering the furnace, the matched AC coil, and the accessories in one shipment means the install crew shows up to a complete jobsite instead of a partial one.

What ordering from HVACMORE gets you:

• Free shipping on eligible orders over $500, freight and lift-gate service available
• Price match if you find the same model number cheaper elsewhere
• 10-Year Parts Warranty on the systems we sell (manufacturer registration required)
• 60-Day Money Back Guarantee
• 30-Day Hassle-Free Returns with no restocking fees
• Financing and rent-to-own options if you'd rather spread the cost

Not sure which brand or model number fits your home? Call 855-575-4822 — US-based, Monday to Friday 8am–9pm ET, weekends included. Reading a model number over the phone before you order takes two minutes and prevents a return.

The bottom line

Between Goodman, Lennox, York, Trane and Carrier, there is no wrong answer on brand — there's a wrong answer on install. Get the Manual J load right, buy the matched furnace + air conditioner pair, insist on the permit, and register the warranty on time. A $6,000 mid-tier furnace installed correctly outlasts a $12,000 premium furnace installed poorly, every single time. Pick the brand where the local dealer bench is strongest, and spend the saved decision energy on the four questions that actually matter at quote time.

Sources

• U.S. Department of Energy — Furnaces and Boilers (AFUE definitions, minimum efficiency standards)
• ENERGY STAR — Furnaces (federal tax credit for high-efficiency furnaces)
• Manufacturer spec sheets and warranty documents (2026) — Goodman, Lennox, York (Johnson Controls), Trane, Carrier
• ACCA Manual J — the residential load calculation standard referenced by most municipal permit inspectors

Model availability, AFUE ratings, warranty terms, and rebate amounts vary by region and change year over year. Confirm current specifications with the manufacturer and confirm rebates with your local utility before purchasing. Federal tax credits are subject to IRS rules in effect at time of install.