Independent Review · Updated June 2026

3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

Solid mid-tier split system delivering 14 SEER cooling and 80% AFUE heating for budget-conscious contractors

7.8
IndustrialRank Score
Efficiency
7.9
Reliability
7.9
Value
8.1
Installation
8.3
Warranty
7.5
3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
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// Bottom Line
This Goodman system works well for contractors replacing older equipment in homes where premium efficiency doesn't justify the cost premium. The 14 SEER rating and 80% AFUE hit a practical middle ground for residential retrofits, especially in moderate climates where heating and cooling loads are balanced.

Review

The Goodman 3.5-ton split system represents the practical middle tier of residential HVAC equipment. With a 14 SEER cooling rating and 100,000 BTU furnace capable of 80% AFUE efficiency, this unit targets the retrofit replacement market where budget constraints meet moderate climate demands. Online Supply's offering positions this system as a straightforward alternative to premium brands, trading some advanced features for accessibility and contractor familiarity with proven Goodman reliability.

Performance metrics reflect competent but unexceptional engineering. The 42,000 cooling BTU output aligns with its 3.5-ton nameplate across a 14 SEER rating, meaning reasonable cooling season electricity consumption. The furnace delivers solid two-stage firing for modulated heating, though 80% AFUE combustion efficiency means roughly one dollar of every five heating dollars vents as waste heat. The scroll compressor operates at 73 dB, acceptable for basements but audible during peak cooling cycles. Multi-speed blower technology with 2,000 CFM capacity better matches variable load conditions than single-speed alternatives.

Pros & Cons

Pros

  • 14 SEER cooling efficiency exceeds baseline requirements in most jurisdictions, reducing homeowner operating costs versus older units
  • 100,000 BTU heating capacity with two-stage burners allows precise temperature modulation and reduced energy waste during mild heating seasons
  • High-efficiency multi-speed blower motor with 2,000 CFM maximum handles variable load conditions better than fixed-speed alternatives
  • Scroll compressor design offers proven reliability and quieter operation at 73 dB compared to rotary designs
  • 10-year warranty with online registration provides reasonable protection for residential applications and contractor peace of mind
  • Upflow configuration with A-coil design fits standard retrofit installations without major ductwork modifications
  • Dual refrigerant compatibility (R410A or R22) eases transitions during system changeovers for older homes

Cons

  • 80% AFUE is entering obsolescence in northern climates, where 95%+ AFUE condensing furnaces are becoming standard and offer better long-term ROI
  • Single-stage condenser compressor cannot modulate capacity, leading to higher cycling losses compared to variable-capacity competitors
  • No Energy Star certification indicates this unit doesn't meet EPA's top-quartile efficiency standards, limiting eligibility for some utility rebates
  • 73 dB noise level is acceptable but not whisper-quiet, noticeable during compressor operation in quiet bedrooms
  • Spec sheet lists conflicting tonnage data (3.5 ton title versus 5 ton specification), creating confusion during sizing and ordering

Who Should Buy

Best For

Contractors performing budget-conscious replacements in mild-to-moderate climates where homeowners prioritize affordability over premium efficiency. This system suits homes with existing ductwork, established heating patterns, and no aggressive rebate programs pushing toward high-efficiency models.

Consider Alternatives If

Homeowners in cold-climate zones should look at 95%+ AFUE furnaces instead. Buyers seeking Energy Star qualification or maximum federal tax credits should explore competing units at similar price points.

3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas F
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Installation

Installation requires standard split-system procedures, time and expertise depending on existing ductwork. The A-coil upflow configuration integrates into most residential installations without major modifications. Electrical demands are straightforward: 120V single-phase 60Hz with 22 to 35-amp breaker sizing provides contractor flexibility for varied panel conditions. Metal flue venting for the furnace must comply with local codes. Suction line insulation (3/8-inch thickness) prevents condensation; verify proper line sizing at 7/8-inch suction and 3/8-inch liquid connections during refrigerant work.

Warranty & Reliability

Goodman includes a 10-year parts warranty conditional upon online registration, standard practice among mid-tier manufacturers. This coverage protects against compressor failure, coil defects, and component manufacturing flaws but typically excludes labor, refrigerant, and wear items. Ten years provides reasonable confidence for retrofit scenarios where homeowners expect 15-20 year equipment lifespans. Registration compliance matters, as claims may be denied without proof of proper installation.

Specifications

SKULS38783830
Brand/ManufacturerOnline Supply
Cooling BTU42,000
Heating BTU100,000
RefrigerantR410A or R22
Electrical120 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)73
Weight (in lbs)30.000000
FeatureSpec
Energy StarNo
SEER1 (Efficiency)14
Condenser StagesSingle Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size7/8"
Max Breaker Size35 amps
Min. Breaker Size22 amps
Tonnage5 Ton
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.
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementMetal
Furnace Efficiency / AFUE80%
Blower MotorHigh Efficiency Multi-Speed
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesTwo
Fuel TypeGas
Liquid Line3/8"
Suction Line7/8"
StyleA-Coil
Suction Line Insulation Thickness3/8"
Length30 feet

Frequently Asked Questions

How does 14 SEER compare to modern air conditioners? +
14 SEER represents solid mid-tier efficiency, suitable for moderate climates but behind current premium units achieving 16-18 SEER. For a 3.5-ton system running 1,500 cooling hours yearly, 14 SEER translates roughly to $400-500 annual cooling costs versus $250-300 for 18 SEER units. The difference justifies upgrades when rebates close the price gap.
Is this system compatible with my existing ductwork from a 1995 installation? +
Likely yes, provided your ducts accommodate 2,000 CFM maximum airflow and your furnace compartment accepts upflow A-coil geometry. Have a contractor verify duct sizing and static pressure. The high-efficiency blower requires proper duct design to prevent noise and pressure problems common in undersized systems.
Why is 80% AFUE problematic in Minnesota or Canada? +
80% AFUE furnaces waste significant heating energy in cold climates where furnaces run 2,000-plus hours annually. Upgrading to a 95% AFUE condensing furnace reduces heating costs by roughly 15-20 percent, recovering the $1,500-2,000 premium within 8-12 years through energy savings alone, plus qualifying for utility rebates.
Should I choose R410A or R22 refrigerant for this system? +
Specify R410A for all new installations. R22 production ended in 2020, and remaining supplies command premium pricing. R410A offers better efficiency and environmental compliance. Clarify refrigerant type at purchase, as this affects future servicing costs and refrigerant availability over the system's operational life.
Does the 10-year warranty cover labor if the compressor fails? +
No. Goodman's warranty covers parts only, not labor or refrigerant. You'll pay $800-1,500 for technician service. Some contractors offer extended service plans covering labor, worth evaluating at purchase time for added financial protection beyond the standard parts coverage.

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