Independent Review · Updated June 2026

3 Ton 18 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

High-efficiency dual-stage system with 18 SEER cooling and 80% AFUE heating at an aggressive price point.

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3 Ton 18 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
$89
Check Price at HVACDirect → Shop Now at HVACDirect
Authorized dealer · Full manufacturer warranty
// Bottom Line
This is an excellent choice for budget-conscious homeowners and contractors seeking a balanced heating and cooling system without premium pricing. The 18 SEER rating and two-stage components deliver genuine efficiency gains, while the $89 price tag makes it accessible for replacement projects where upfront costs matter.

Review

This Goodman system positions itself as the practical middle ground in the residential HVAC market. At just $89, it undercuts many competitors while bundling both heating and cooling components rated for 3-ton cooling capacity and 100,000 BTU heating output. The two-stage design on both cooling and heating sides suggests Goodman engineered this unit for contractors and homeowners who prioritize efficiency without demanding boutique-level specifications or premium brand markup.

Performance metrics show genuinely respectable numbers. The 18 SEER cooling efficiency rating means real energy savings during peak summer months, while the 80% AFUE furnace converts four-fifths of fuel into usable heat, a solid middle-ground between basic units and high-efficiency alternatives. The variable-speed blower motor adjusts output to actual demand, reducing energy waste. Maximum CFM of 2,000 ensures adequate air circulation, and the scroll compressor handles 35,000 cooling BTU at 71 decibels, which is acceptable for residential areas without being exceptionally quiet.

Pros & Cons

Pros

  • 18 SEER efficiency rating places it in the high-efficiency category for air conditioning performance
  • Two-stage condenser and scroll compressor reduce runtime and energy consumption compared to single-stage units
  • 80% AFUE furnace with two-stage burner and variable-speed blower motor improves heating efficiency
  • 100,000 BTU heating capacity suits most residential applications from 2,500 to 3,500 square feet
  • Energy Star certified, qualifying some buyers for utility rebates and tax incentives

Cons

  • Spec sheet lists conflicting tonnage information, showing both 3 ton and 5 ton which raises verification concerns
  • 80% AFUE furnace is adequate but not premium; modern high-efficiency models reach 95%+ AFUE
  • Limited details on compressor scroll type reliability history compared to established Goodman models at higher price points

Who Should Buy

Best For

Homeowners replacing an aging system who want modern efficiency without paying for premium features, and contractors doing volume installations where cost control directly impacts project margins. This unit delivers measurable efficiency improvements over 10-year-old equipment at an entry-level investment.

Consider Alternatives If

Anyone seeking top-tier AFUE ratings above 90%, or customers in extreme climates where maximum heating efficiency justifies the premium cost.

3 Ton 18 SEER 80% AFUE 100,000 BTU Goodman Gas Fur
$89
Buy at HVACDirect →

Installation

This upflow configuration suits standard residential installations in basements or utility closets. The A-coil design connects cleanly to ducting. Electrically, it requires 120V single-phase 60Hz service with breaker capacity between 21.3 and 35 amps, typical for most homes. Suction line insulation of 3/4 inch thickness is standard, and the 50-foot liquid line accommodates most split-system layouts without modification.

Warranty & Reliability

Goodman provides a 10-year warranty following online registration, covering manufacturing defects on compressor and major components. Registration is straightforward and essential, as it activates full coverage. For the price point, this warranty is competitive and protects against early failure, though some premium competitors offer longer periods on specific components.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU100,000
RefrigerantR410A or R22
Electrical120 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)71
Weight (in lbs)30.000000
FeatureSpec
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
Tonnage5 Ton
Valve TypeSweat
Height30"
Width24.5"
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 MotorVariable Speed
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesTwo
Fuel TypePropane, Natural Gas
Liquid Line3/8"
Suction Line7/8"
StyleA-Coil
Suction Line Insulation Thickness3/4"
Length50 feet

Frequently Asked Questions

Is the 18 SEER rating current with 2024 standards? +
The 18 SEER rating shown in specs appears to be SEER1, the older rating system phased out in 2023. Current models should show SEER2 ratings, which are approximately 15-20% lower than SEER1. Request SEER2 documentation before purchase to verify actual modern efficiency performance.
Can this unit use both R410A and R22 refrigerant? +
The specs list both options, but manufacturing in recent years shifted entirely to R410A as R22 was phased out. Confirm with the seller whether this unit is R410A only. If R22 capable, it's likely older stock, which may affect warranty interpretation.
How does 80% AFUE compare to other furnaces at this price? +
80% AFUE is standard for mid-range units. Budget models start at 78%, while contractor-grade alternatives reach 85-90% AFUE for $200-400 more. Over 15 years, higher AFUE saves roughly $300-600 in heating costs depending on climate and gas prices.
What's the difference between 3-ton and 5-ton in the specs? +
The spec sheet conflicts, showing both ratings. Contact Online Supply directly for clarification. If this is truly 5-ton, it oversizes most homes and wastes energy. Confirm cooling capacity matches your home's actual load before ordering.
Does the 10-year warranty cover labor or just parts? +
Goodman's standard warranty covers parts and compressor only. Labor is the homeowner's or contractor's responsibility. Registration within the specified window is mandatory to activate coverage.

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