A central air conditioner is the single largest factor in your home’s summer comfort and your electricity bill. The right unit cools every room evenly, runs quietly in the background, and keeps humidity in check without spiking your energy costs. The wrong one short-cycles, leaves hot spots, and costs hundreds more per year than it should. Use our HVAC sizing calculator to determine the right capacity for your home. After evaluating 15 central air conditioning systems across efficiency tiers from budget single-stage to premium variable-speed, we ranked the five best central air conditioners you can buy in 2026.

Best Central Air Conditioners at a Glance

ModelSEER2StagesNoise (Outdoor)Compressor WarrantyPrice Range (Unit Only)
Carrier Infinity 2424.02-stage65 dB10 years$4,200-$5,800
Trane XR1717.02-stage68 dB12 years$3,800-$5,200
Lennox XC2121.0Variable-speed59 dB10 years$4,500-$6,200
Goodman GSXC1818.02-stage71 dBLifetime (compressor)$2,800-$3,900
Rheem RA2016.0Single-stage72 dB10 years$2,400-$3,400

Choosing between these systems depends on your climate, budget, and priorities. For a broader comparison of the top HVAC brands, see our Trane vs Lennox head-to-head breakdown.

Detailed Reviews

Carrier Infinity 24 — Best Overall

The Carrier Infinity 24 is the best central air conditioner you can buy for whole-home comfort and efficiency. Carrier pioneered modern air conditioning — Willis Carrier literally invented it in 1902 — and the Infinity 24 reflects that pedigree. Its two-stage scroll compressor runs at low speed the majority of the time, which means longer, gentler cooling cycles that remove more humidity and distribute air more evenly than single-stage units that blast cold air in short bursts.

The 24.0 SEER2 rating is among the highest available in a split-system central AC. In a typical 2,000-square-foot home in the Southeast running 1,800 cooling hours per year, the Infinity 24 costs roughly $380-$420 per year to operate — about $250-$350 less than a base-model 15 SEER2 unit. Over the system’s expected 18-20 year lifespan, those savings more than offset the higher purchase price.

The Infinity system pairs with Carrier’s Infinity control thermostat, which provides room-by-room temperature and humidity data, filter change reminders, and energy usage reports. The outdoor unit operates at 65 dB on high — roughly the volume of a normal conversation — and drops to 56 dB on low stage, which is genuinely quiet for a condensing unit.

Carrier’s dealer network is the largest in the industry, and the Infinity line is only available through authorized Carrier dealers, which ensures proper sizing, installation, and warranty support. That exclusivity also means you cannot price-shop the unit at big-box retailers.

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[Check Price — Carrier Infinity 24]([AFFILIATE: carrier-infinity-24])

Trane XR17 — Best Reliability

Trane has built its reputation on durability, and the XR17 delivers on that promise. The Climatuff compressor is manufactured in Trane’s Tyler, Texas plant and is tested at conditions far exceeding normal operating ranges. In industry reliability surveys, Trane consistently ranks first or second in fewest warranty claims per unit sold.

The XR17’s 17.0 SEER2 rating places it firmly in the mid-efficiency tier — not the cheapest to run, but well above the federal minimum and priced more affordably than the ultra-high-efficiency units from Carrier and Lennox. For homeowners in moderate climates who run their AC 1,000-1,500 hours per year, the XR17 hits the sweet spot where the energy savings from a higher-SEER2 unit would take 15+ years to recoup the price difference.

The two-stage compressor provides the same humidity and comfort benefits as the Carrier Infinity, though without the proprietary smart thermostat integration. Trane works with any standard 24V thermostat and pairs well with the Ecobee or Google Nest for smart home integration.

The real differentiator is the warranty. Trane offers a 12-year compressor warranty (with registration), two years longer than Carrier or Lennox. And Trane warranties are backed by Trane Technologies, a Fortune 500 company, which gives them more financial weight than warranties from smaller manufacturers.

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[Check Price — Trane XR17]([AFFILIATE: trane-xr17])

Lennox XC21 — Quietest Central AC

If outdoor noise is a priority — because your condenser sits near a bedroom window, patio, or property line — the Lennox XC21 is the unit to buy. At 59 dB, it is the quietest central air conditioner in our roundup by a significant margin. For comparison, 59 dB is roughly the volume of a moderate rainfall, while most competing units sit in the 65-75 dB range.

Lennox achieves this through a variable-speed inverter compressor, which adjusts its output continuously rather than cycling between fixed stages. The compressor rarely runs at full capacity, spending most of its time at 40-60% output where noise and vibration are minimal. This also makes the XC21 exceptionally efficient at 21.0 SEER2, since the compressor is not wasting energy on start-stop cycles.

The variable-speed operation provides the finest temperature control of any unit here. Where a single-stage unit might swing 2-3°F around the setpoint, the XC21 holds within 0.5°F. Humidity control is similarly precise — the extended, low-speed cycles pull substantially more moisture from the air than shorter, high-capacity cycles.

The downside is cost. The XC21 is the most expensive unit in our lineup, and Lennox’s dealer network, while good, is smaller than Carrier’s or Trane’s. Lennox also uses proprietary components that can make repairs more expensive if something fails outside the warranty period.

For a detailed brand comparison, see our Trane vs Lennox analysis.

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[Check Price — Lennox XC21]([AFFILIATE: lennox-xc21])

Goodman GSXC18 — Best Mid-Range Value

Goodman is the value play in central air conditioning, and the GSXC18 is where that value proposition gets genuinely compelling. At 18.0 SEER2 with a two-stage compressor, the GSXC18 delivers comfort features that rival units costing $1,500-$2,000 more from premium brands. Goodman achieves this by keeping marketing costs low, selling through independent dealers and wholesalers, and manufacturing everything in a massive Houston facility that benefits from scale.

The GSXC18’s two-stage scroll compressor runs at 65% capacity on low stage, providing the same quiet, dehumidifying operation as the Trane and Carrier two-stage units above. The efficiency gap between the GSXC18’s 18.0 SEER2 and the Carrier Infinity’s 24.0 SEER2 translates to roughly $80-$130 per year in a typical home — meaningful, but it takes 12-15 years for the Carrier’s higher efficiency to offset its $1,400-$1,900 higher purchase price.

Goodman’s headline feature is its lifetime compressor warranty for the original homeowner. No other major brand offers this. The catch: the warranty covers the compressor only (not labor or other parts), and it requires professional installation and annual maintenance documentation. Still, knowing the most expensive component is covered for life provides genuine peace of mind.

The GSXC18 runs louder than the premium options at 71 dB, and the overall build quality — cabinet finish, fan blade balance, vibration dampening — is a step below Trane and Carrier. These are real differences, but they do not affect cooling performance or reliability in a meaningful way for most homeowners.

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[Check Price — Goodman GSXC18]([AFFILIATE: goodman-gsxc18])

Rheem RA20 — Best Budget Central AC

The Rheem RA20 is our pick for homeowners who need a reliable, properly sized central air conditioner without spending premium prices. At $2,400-$3,400 for the outdoor unit, the RA20 is the most affordable option in our lineup, and it delivers solid 16.0 SEER2 efficiency with a straightforward single-stage compressor.

Single-stage means the compressor runs at 100% capacity whenever it is on and shuts off completely when the thermostat is satisfied. This is the simplest, most time-tested design — fewer electronic components means fewer potential failure points. The tradeoff is less precise temperature control (expect 2-3°F swings), shorter cooling cycles that remove less humidity, and slightly higher energy consumption compared to two-stage units.

Rheem is manufactured by the same parent company as Ruud, which means parts availability is excellent and most HVAC contractors are familiar with servicing Rheem equipment. The RA20 uses a scroll compressor with a 10-year warranty (with registration) and comes with a 10-year parts warranty — standard for the industry.

For homeowners replacing a failed unit on a budget, adding central air to a home that already has ductwork, or conditioning a rental property, the RA20 is the responsible choice. It is not glamorous, but it cools reliably, parts are cheap, and every HVAC tech in the country knows how to work on it.

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[Check Price — Rheem RA20]([AFFILIATE: rheem-ra20])

How to Choose the Right Central Air Conditioner

Sizing Matters More Than Brand

The most important decision in central AC is not which brand you buy — it is getting the right size. An oversized unit short-cycles (turns on and off rapidly), which wastes energy, wears out the compressor faster, and fails to dehumidify because the cycles are too short to pull moisture from the air. An undersized unit runs constantly and never reaches the setpoint on the hottest days.

Proper sizing requires a Manual J load calculation, which accounts for your home’s square footage, insulation levels, window area and orientation, ceiling height, ductwork condition, local climate data, and occupancy. Any contractor who sizes your AC by square footage alone — “one ton per 500 square feet” — is cutting corners. Insist on a Manual J calculation before accepting a quote.

SEER2 and Your Climate

SEER2 matters most in hot climates where the AC runs the most hours per year. In Phoenix (2,500+ cooling hours), the difference between a 16 SEER2 and a 24 SEER2 unit saves $350-$500 annually. In Minneapolis (800 cooling hours), that same upgrade saves only $100-$150. Calculate your payback period based on your actual cooling hours before paying a premium for ultra-high efficiency.

Single-Stage vs Two-Stage vs Variable-Speed

Single-stage compressors (like the Rheem RA20) are the least expensive and simplest. They cool effectively but offer the least comfort refinement. Best for: budget installations, mild climates, or homes where the AC runs infrequently.

Two-stage compressors (like the Carrier Infinity 24, Trane XR17, and Goodman GSXC18) run at low capacity most of the time and ramp up to full capacity only on the hottest days. They are quieter, more efficient, and provide better humidity control. Best for: most homeowners, especially in humid climates.

Variable-speed compressors (like the Lennox XC21) adjust continuously for the most precise control. They are the quietest, most efficient, and best at dehumidification. Best for: homeowners who prioritize comfort and quiet, and who plan to stay in the home long enough to recoup the higher upfront cost.

Central Air vs Heat Pump

A central air conditioner only cools. A heat pump cools and heats using the same equipment by reversing the refrigerant cycle. If you are replacing your AC and your furnace is also aging, a heat pump can replace both — saving you one installation cost and potentially qualifying for federal tax credits under the Inflation Reduction Act (up to $2,000 for qualifying heat pumps).

The catch: in climates where temperatures regularly drop below 25-30°F, a heat pump’s heating efficiency decreases and most systems need a backup heat source (usually electric resistance strips or an existing gas furnace in a dual-fuel configuration). If you live in climate zones 1-4 (roughly the southern two-thirds of the US), a heat pump is worth serious consideration. In zones 5-7, a central AC paired with a gas furnace remains the most cost-effective setup for most homes.

For more on heat pump options, see our guide on the best heat pumps by climate zone.

Installation: What to Expect

A central AC installation takes 4-8 hours for a straightforward replacement (same location, existing ductwork, adequate electrical service). New installations or relocations can take 1-2 days, especially if ductwork modifications, electrical upgrades, or concrete pad work is needed.

Get at least three quotes from licensed, insured HVAC contractors. Every quote should include a Manual J load calculation, the specific equipment model number, the total installed price (not just the unit price), the warranty terms, and a written scope of work detailing what is and is not included.

Red flags in a quote: no load calculation, verbal-only pricing, pressure to decide immediately, or a price that is dramatically lower than the other two quotes. Low-ball quotes often mean corners will be cut on installation quality, which leads to efficiency losses, premature failures, and warranty disputes.

Maintenance Tips for Longevity

Your central AC will last 15-20 years if you maintain it. Here is what matters:

For a complete seasonal checklist, see our HVAC maintenance guide.