Independent Review · Updated June 2026

4 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

Solid mid-tier 4-ton system balancing 80% heating efficiency with 18 SEER cooling.

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
4 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
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// Bottom Line
This Goodman system works well for homeowners upgrading from older equipment who want reliable performance without premium pricing. It's especially practical for mixed climates where both heating and cooling matter, and the two-stage burner handles variable heating loads efficiently.

Review

The Goodman 4-ton system strikes a practical middle ground in today's HVAC market. With 18 SEER cooling and 80% AFUE heating, it delivers respectable efficiency without premium pricing. The upflow configuration fits standard basement installations, and Goodman's reputation for straightforward, repairable equipment appeals to contractors managing service calls. This isn't cutting-edge technology, but it's the kind of solid workhorse system that handles real-world demands without unnecessary complexity.

Performance data shows this unit well-matched for 4-ton cooling demand, with 47,000 BTU capacity and two-stage scroll compressor. The 100,000 BTU heating output splits across two burner stages, allowing the system to run at 50% capacity during partial-load conditions, which reduces short-cycling and improves humidity control. Variable-speed blower maxes at 2000 CFM, adapting to actual ductwork resistance. The 18 SEER rating puts it ahead of many 2015-era systems still operating in older homes, making it a genuine efficiency upgrade.

Pros & Cons

Pros

  • 18 SEER cooling efficiency exceeds most mid-market alternatives and qualifies for Energy Star
  • Two-stage burner modulates heating output, reducing runtime and energy waste during mild weather
  • Variable-speed blower motor adjusts to actual heating/cooling demand, improving comfort and lowering bills
  • Two-stage condenser matches furnace staging for coordinated heating and cooling cycles
  • Dual fuel capability handles both natural gas and propane without conversion kits

Cons

  • 80% AFUE is acceptable but not high-efficiency; condensing furnaces reach 95%+ and qualify for better rebates
  • Metal flue requirement limits installation flexibility compared to PVC-capable systems
  • 72 dBA noise level is moderate; some competing units operate quieter under full load

Who Should Buy

Best For

Homeowners in moderate climates looking to replace 10-15 year old equipment with reliable, balanced performance. This system suits properties where both heating and cooling seasons matter, and upflow configuration works with basement installations.

Consider Alternatives If

Buyers in cold climates needing maximum heating efficiency should consider 95% AFUE condensing furnaces. High-noise-sensitive installations should compare sound-optimized alternatives.

4 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Fur
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Installation

Installation requires metal flue connections and standard 208/230V single-phase power with 29.3 to 50-amp breaker sizing. The A-coil configuration works in upflow or downflow positions, suiting most basement setups. Height of 38.25 inches fits tight mechanical rooms. Sweat valve connections use 3/8-inch liquid line and 7/8-inch suction line, standard for 4-ton refrigerant work. Experienced HVAC installers typically handle this system in 4-6 hours, including ductwork modifications.

Warranty & Reliability

Goodman provides 10-year parts warranty with online registration, a solid commitment that covers compressor, coil, and blower failures. Registration is straightforward and extends coverage from the typical 5-year standard. This warranty period positions it competitively against mid-tier brands. Full warranty requires proper installation and maintenance documentation, so work with licensed contractors who complete required registrations.

Specifications

SKUDSXC180481
Brand/ManufacturerGoodman
Cooling BTU47,000
Heating BTU100,000
RefrigerantR410A
Electrical208 / 230 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)72
Weight (in lbs)290.000000
FeatureSpec
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementMetal
Furnace Efficiency / AFUE80%
Blower MotorVariable Speed
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesTwo
Fuel TypePropane, Natural Gas
Height38.25"
Width35.5"
Depth35.5"
ResourcesGoodman Specifications Goodman Installation Manual You will need Adobe® Acrobat® Reader to view PDF documents.
Safety InformationPROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here.
Liquid Line3/8"
Suction Line7/8"
Tonnage4 Ton
StyleA-Coil
Energy StarYes
SEER1 (Efficiency)18
Condenser StagesTwo Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size7/8"
Max Breaker Size50 amps
Min. Breaker Size29.3 amps
Valve TypeSweat

Frequently Asked Questions

How does 18 SEER compare to systems I see priced higher? +
18 SEER is genuinely good, meeting Energy Star requirements and beating most 15-year-old installations. Higher-priced systems reach 20-22 SEER with variable-speed compressors and advanced controls, but 18 SEER delivers 90% of that efficiency gain at lower cost. For most homeowners, the remaining 10% difference costs more in upfront price than energy savings justify.
Can I switch between natural gas and propane? +
Yes, this system accepts both fuels. However, propane requires slightly different burner calibration than natural gas. Most installers set it at installation for one fuel type. Switching later is possible but requires a service call to adjust gas pressure and ignition timing. Plan fuel choice at time of installation.
What does two-stage heating actually save me? +
Two-stage burners run at 50% capacity during mild weather instead of cycling full-on and full-off. This reduces runtime roughly 15-20% in shoulder seasons (spring and fall) and improves comfort by reducing temperature swings. In harsh winter months, you'll see modest savings as the system runs full-stage more often.
How does this compare to higher-efficiency Lennox or Carrier alternatives? +
Premium brands offer 95% AFUE furnaces and 21-23 SEER cooling at 25-40% higher prices. Goodman targets contractors and budget-conscious owners prioritizing value. You sacrifice some efficiency and noise performance, but gain proven reliability and lower service costs. The 18 SEER here beats premium brands from 2012-2015.
Does the 10-year warranty include labor costs? +
No, the 10-year parts warranty covers components only. Labor for repairs, refrigerant, and diagnostics are your responsibility. This is standard across brands. Many homeowners add service plans that cover labor for additional yearly cost.

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