Independent Review · Updated June 2026

5 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow

High-efficiency 5-ton combo with 97% AFUE furnace and 16 SEER2 cooling.

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
5 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow
Current Price
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// Bottom Line
This Goodman system delivers excellent heating and cooling efficiency for homeowners in moderate climates who want a reliable packaged solution without premium pricing. The 97% AFUE furnace and 16 SEER2 air conditioner make it ideal for those serious about energy bills but not requiring top-tier variable-speed technology.

Review

This 5-ton Goodman system bundles a furnace and air conditioner into a single downflow package, appealing to homeowners and contractors seeking straightforward efficiency without complex logistics. Online Supply positions this as an ENERGY STAR qualified unit at an accessible price point, making it competitive against split systems in the mid-range market. The combination of high-efficiency heating and respectable cooling performance addresses the dual-season needs of temperate climates effectively.

The furnace delivers 100,000 BTU input with 97% AFUE, meaning almost all fuel converts to usable heat rather than waste up the flue. The air conditioner produces 54,000 BTU cooling capacity with a 16 SEER2 rating, comfortably exceeding ENERGY STAR thresholds. The variable-speed ECM blower motor reaches 2,000 CFM maximum and runs quietly at 73 dB. A modulating burner and scroll compressor provide incremental performance adjustments, though cooling remains single-stage rather than multi-capacity.

Pros & Cons

Pros

  • 97% AFUE furnace efficiency significantly reduces heating fuel consumption and monthly costs
  • 16 SEER2 cooling rating exceeds ENERGY STAR requirements, supporting rebate eligibility
  • Modulating gas burner adjusts output precisely, improving comfort and efficiency compared to single-stage units
  • Variable-speed ECM blower motor adapts airflow for quiet operation and better humidity control
  • 10-year warranty with online registration provides solid protection against manufacturing defects
  • Compact 21x21x30 inch footprint and 48 lb weight accommodate tight basement or attic installations
  • Scroll compressor is proven technology with excellent reliability track record
  • Downflow/horizontal configuration offers installation flexibility for various home layouts

Cons

  • Single-stage cooling compressor cannot modulate like premium models, reducing part-load efficiency
  • 73 dB noise level is moderate, higher than variable-capacity systems in light cooling demand
  • Specs list 54,000 cooling BTU but header states 5 tons, creating minor documentation inconsistency
  • PVC exhaust requirement limits furnace placement options compared to metal flue designs

Who Should Buy

Best For

Homeowners in moderate climates seeking a balanced efficiency upgrade without premium system costs, and contractors building affordable all-in-one solutions for budget-conscious clients. This system works well for homes where heating and cooling demands are fairly consistent.

Consider Alternatives If

Those in extreme climates needing variable-capacity cooling, homes with very tight acoustic requirements, or anyone planning to stay under 10 years who cannot register the warranty.

5 Ton 15 SEER 97% AFUE 100,000 BTU Goodman Gas Fur
$0
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Installation

Downflow configuration requires positive-pressure ducting below the unit, common in slab or attic layouts. PVC exhaust venting is mandatory, simplifying flue work compared to Category IV furnaces. The 115V, 60Hz electrical demand requires a 29.6 to 50 amp breaker, standard for most homes. Refrigerant lines use 3/8 inch liquid and 1 1/8 inch suction connections with 1/2 inch insulation rated for 50 feet run length.

Warranty & Reliability

Goodman provides 10 years of parts coverage when you register the system online, a customer-friendly requirement that's straightforward to complete. This protects against compressor failure, heat exchanger cracks, and other manufacturing defects. Labor coverage is not specified in this listing, so confirm details with your contractor or retailer before purchase.

Specifications

SKULS381183850
Brand/ManufacturerOnline Supply
Cooling BTU54,000
Heating BTU100,000
RefrigerantR410A
Electrical115 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)73
Weight (in lbs)48.000000
FeatureSpec
Energy StarYes
SEER1 (Efficiency)16
Condenser StagesSingle Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size7/8"
Max Breaker Size50 amps
Min. Breaker Size29.6 amps
Tonnage5 Ton
Height30"
Width21"
Depth21"
ResourcesCAPT Installation Manual CAPT Specifications Sheet Goodman Evaporator Coil Warranty 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.
AHRI Certificate Number7424272
Airflow DirectionDownflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Product FeaturesRebate Available
Furnace Efficiency / AFUE97%
Blower MotorVariable Speed - ECM
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesModulating
Fuel TypePropane, Natural Gas
Liquid Line3/8"
Suction Line1 1/8"
StyleA-Coil
Suction Line Insulation Thickness1/2"
Length50 feet

Frequently Asked Questions

How does the 97% AFUE furnace compare to older systems? +
A 97% AFUE rating is top-tier efficiency for gas furnaces, meaning you waste only 3% of fuel as exhaust heat. Older units at 78% AFUE waste 22%, translating to roughly 19% lower fuel consumption annually. For a home using 80 therms yearly, that's approximately $150 in annual savings at current gas prices.
Can this downflow unit fit in a basement or attic installation? +
Yes, the downflow/horizontal configuration is designed for both spaces. At 21x21x30 inches and weighing 48 pounds, it fits tight crawlspaces. PVC exhaust venting is simpler than traditional flue work. However, confirm adequate clearance for the 50-foot refrigerant line run and ensure your ductwork accommodates downflow discharge.
What does 16 SEER2 cooling efficiency really mean for my electric bill? +
SEER2 measures cooling output per watt consumed, with 16 being very efficient. A 16 SEER2 system costs roughly 15 to 20 percent less to operate annually than a 14 SEER2 unit in moderate climates. For a home using 3,000 cooling hours yearly, you'll save approximately $100 to $150 annually depending on regional electricity rates.
How does the modulating burner improve comfort compared to single-stage furnaces? +
Modulating burners adjust heat output between approximately 40% and 100% capacity, matching actual demand. Single-stage burners run at full blast or off, cycling frequently and creating temperature swings. Modulating reduces cycling by 50 to 70%, lowering noise, improving humidity management, and delivering steadier comfort on mild days.
Does the 10-year warranty cover labor and installation mistakes? +
The listing specifies parts coverage with online registration, but labor is not mentioned. Contact Goodman or your retailer to confirm whether installation labor and technician errors are covered. Most manufacturers limit labor to 1 to 2 years, with parts coverage extending 10 years.

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