Independent Review · Updated June 2026

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

Budget-friendly 3-ton system with solid 80% AFUE heating and 17 SEER cooling.

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
$736
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// Bottom Line
This Goodman system delivers solid mid-range efficiency at an aggressive $736 price point, making it ideal for budget-conscious homeowners and contractors managing tight project margins. Best suited for moderate climates where you're not chasing top-tier efficiency ratings.

Review

The Goodman 3-ton system represents a pragmatic entry point into modern HVAC equipment. Priced at just $736, it undercuts premium brands significantly while maintaining respectable efficiency certifications. This upflow configuration with variable-speed blower makes it flexible for retrofit work or new construction. Two-stage compressors and burners reflect modern design without premium pricing, positioning Goodman as a volume manufacturer trusted by contractors managing cost-sensitive projects across residential markets.

Performance metrics tell a practical story. The furnace delivers 100,000 BTU heating capacity at 80% AFUE efficiency, which is adequate but not exceptional compared to 92% AFUE alternatives in the same price range. Cooling operates at 17 SEER with 35,000 BTU capacity across two condenser stages, allowing the unit to modulate output and reduce energy consumption during mild weather. The scroll compressor and R410A/R22 refrigerant compatibility ensure reliable operation, though cooling efficiency lags premium 20+ SEER units by roughly 3 percentage points in seasonal performance.

Pros & Cons

Pros

  • Two-stage heating and cooling reduces energy waste during partial-load operation, lowering monthly utility bills compared to single-stage equipment
  • Variable-speed blower motor adjusts airflow from 0 to 2,000 CFM, improving comfort and reducing noise compared to single-speed alternatives
  • 80% AFUE furnace efficiency meets modern minimum standards and qualifies for Energy Star certification with utility rebates in many regions
  • 17 SEER cooling rating positions this as above-average for budget systems, though not premium tier
  • Two-valve configuration with 3/8 inch liquid and 7/8 inch suction lines simplifies field piping work for technicians
  • 10-year parts warranty with online registration provides meaningful coverage without requiring professional registration proof

Cons

  • 80% AFUE is mid-range, not high-efficiency, meaning 20 cents of every heating dollar escapes as waste, while 95%+ systems exist in similar price brackets
  • 17 SEER (noted as SEER1 in specs) trails premium 20+ SEER systems by 15-20% cooling efficiency, impacting summer operating costs
  • 3.5-ton tonnage mismatches the stated 3-ton marketing claim, creating confusion during specification review and potential oversizing in smaller homes
  • Metal flue requirement limits installation flexibility in homes with existing masonry or power-vented setups

Who Should Buy

Best For

Homeowners in moderate climates seeking straightforward heating and cooling without premium efficiency premiums, and contractors bidding competitive jobs where initial cost matters more than long-term utility savings. Also suitable for rental properties or investment homes where efficiency investment won't be recouped.

Consider Alternatives If

Buyers in cold northern climates should pursue 90%+ AFUE systems, and anyone in hot southern regions should target 20+ SEER units to justify operating costs over 15+ year lifecycles.

3 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Fur
$736
Buy at HVACDirect →

Installation

Installation requires standard sheet metal ductwork sized for 2,000 CFM maximum airflow. The unit demands 208/230V single-phase 60Hz service with breaker sizing between 21.3 and 35 amps, making it compatible with most residential electrical panels. Metal flue piping is mandatory for exhaust, which may require modifications in homes with existing masonry chimneys. Standard refrigerant line set requirements use 3/8 inch liquid and 7/8 inch suction lines with 3/4 inch insulation, totaling 50 feet maximum.

Warranty & Reliability

Goodman provides a 10-year parts warranty upon online registration, covering compressors, heat exchangers, and most major components. Registration is straightforward and online-enabled, avoiding technician signature requirements that complicate claims. This coverage is solid for budget equipment but trails high-end brands offering 10-15 years on compressors alone. Evaporator coil warranty documentation is available separately, worth reviewing for cooling-specific protection details.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU100,000
RefrigerantR410A or R22
Electrical208 / 230 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)71
Weight (in lbs)30.000000
FeatureSpec
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementMetal
Furnace Efficiency / AFUE80%
Blower MotorVariable Speed
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesTwo
Fuel TypePropane, Natural Gas
Height30"
Width21"
Depth21"
ResourcesCAPF Installation Manual CAPF 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.
Product FeaturesTwo Stage Condenser
Energy StarYes
SEER1 (Efficiency)18
Condenser StagesTwo Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size3/4"
Max Breaker Size35 amps
Min. Breaker Size21.3 amps
Tonnage3.5 Ton
Valve TypeSweat
Liquid Line3/8"
Suction Line7/8"
StyleA-Coil
Suction Line Insulation Thickness3/4"
Length50 feet

Frequently Asked Questions

Why does the spec sheet list 3.5 ton capacity when this is marketed as a 3-ton system? +
The tonnage discrepancy likely reflects the air handler rating versus condenser rating. Verify actual cooling capacity against your cooling load calculation before installation. A 3.5-ton unit may oversize smaller homes, reducing efficiency by cycling less frequently. Request clarification from your supplier on which tonnage applies to your specific configuration.
Can I install this in a downflow configuration, or is it strictly upflow? +
The specifications indicate upflow/horizontal capability with downflow configuration listed. However, confirm with the installation manual whether downflow requires different blower orientation or ductwork modifications. Some Goodman units require reconfiguration for downflow, so review CAPF Installation Manual documentation before purchasing if downflow is required.
How does 80% AFUE compare to other furnaces at this price point? +
80% AFUE is industry standard minimum and Energy Star qualified, but 90-95% AFUE systems are available in similar price brackets from budget manufacturers. Over 20 years, a 95% unit saves approximately $2,000-3,000 in heating costs depending on climate. Calculate your specific payback period using local gas rates before deciding whether efficiency premium justifies cost.
Is 17 SEER competitive for a budget cooling system? +
17 SEER is above-average for budget equipment but 15-18% less efficient than 20+ SEER premium systems. Summer cooling costs will be noticeably higher in hot climates over 15-year equipment lifespan. For southern regions with extended cooling seasons, investing in 19-20 SEER typically delivers better lifecycle value despite higher initial cost.
What does the 10-year warranty actually cover, and what's excluded? +
The 10-year parts warranty covers compressor, heat exchanger, and most internal components upon online registration. Exclusions typically include labor, refrigerant, filters, and damage from improper installation or maintenance. Review the detailed warranty document provided by Online Supply for specific coverage limits and claim procedures before installation.

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