Independent Review · Updated June 2026

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

Budget-friendly 18 SEER combo system with solid two-stage efficiency

7.4
IndustrialRank Score
Efficiency
8.2
Reliability
7.5
Value
8.8
Installation
7.8
Warranty
7.5
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 system makes sense for budget-conscious homeowners upgrading older equipment or contractors managing tight project costs. The 18 SEER cooling efficiency and 80% AFUE heating meet modern standards without premium pricing, though some specs suggest quality control inconsistencies.

Review

This Goodman combo system represents the pragmatic middle ground in residential HVAC equipment. At $89, it delivers modern efficiency ratings without premium pricing, making it accessible to cost-conscious homeowners and value-focused contractors. The two-stage configuration addresses real comfort concerns by avoiding the constant on-off cycling of single-stage systems. For upflow installations in standard residential applications, this unit checks the essential boxes.

The 18 SEER cooling efficiency and 80% AFUE heating performance meet current minimum standards effectively. The 35,000 BTU cooling capacity with a variable-speed blower motor adapts output to actual demand, reducing energy waste during partial-load conditions. Maximum CFM of 2,000 suits typical residential ductwork systems. The 100,000 BTU heating output handles most single-family homes, though sizing calculations remain essential. Combined with R410A refrigerant compatibility and scroll compressor technology, these specs deliver predictable performance.

Pros & Cons

Pros

  • 18 SEER rating delivers solid cooling efficiency, qualifying for Energy Star and utility rebates in many regions
  • Two-stage compressor and burner stages reduce runtime and energy consumption compared to single-stage units
  • 35,000 BTU cooling capacity with variable-speed blower motor provides responsive temperature control and better comfort
  • 100,000 BTU heating capacity handles most residential applications across moderate climates
  • Extremely competitive $89 price point for a complete condensing unit combo system
  • 10-year warranty with online registration covers manufacturing defects adequately

Cons

  • 80% AFUE is acceptable but not exceptional, modern high-efficiency furnaces reach 95%+ AFUE
  • Spec sheet lists both 3-ton and 5-ton tonnage, suggesting potential documentation errors that raise reliability concerns
  • 71 dB noise level runs slightly louder than premium two-stage units, noticeable during operation
  • Requires metal exhaust flue with specific installation requirements adding complexity and cost

Who Should Buy

Best For

Homeowners in moderate climates seeking affordable equipment replacement or first-time buyers without budget for premium systems. Contractors completing spec-to-budget projects will appreciate the low price and solid efficiency ratings.

Consider Alternatives If

Anyone in cold climates needing maximum heating efficiency, customers prioritizing whisper-quiet operation, or buyers concerned about unit quality control should investigate further.

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

Installation

Installation requires proper refrigerant line sizing with 3/8 inch liquid and 7/8 inch suction lines, both available with 3/4 inch factory insulation. The unit connects via sweat valve connections, necessitating qualified technician work. A metal exhaust flue is mandatory, and electrical service needs 21.3 to 35 amp breaker capacity at 120V single phase. Upflow configuration works with A-coil evaporators in standard attic or basement placements.

Warranty & Reliability

Online registration unlocks 10 years of manufacturing defect coverage, which is solid middle-tier protection. This warranty covers compressor failure, heat exchanger defects, and component malfunctions. Refrigerant leaks and wear items typically require extended coverage purchases. For budget systems at this price point, the 10-year period provides reasonable peace of mind, though read registration requirements carefully.

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"
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 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

Why does the spec sheet list both 3-ton and 5-ton ratings? +
This appears to be a documentation error from the manufacturer or distributor. The 35,000 BTU cooling capacity aligns with 3-ton equipment, while 5-ton would deliver 60,000 BTU. Request clarification from your supplier before purchase. Tonnage mismatch affects system matching and efficiency calculations.
Can this unit work with my existing ductwork? +
The 2,000 CFM maximum output suits standard residential ducting. However, undersized ducts can reduce efficiency and comfort. Have an HVAC technician calculate required duct sizing for your home. The variable-speed blower adapts to what you have, but proper sizing remains important for performance.
Is 18 SEER good enough, or should I buy higher rated equipment? +
18 SEER is modern and efficient, qualifying for Energy Star. Higher ratings like 20-22 SEER cost significantly more but deliver 10-15% better cooling efficiency. For a 15-year system lifespan, calculate whether energy savings justify the premium cost in your climate.
How does this compare to higher-priced Goodman or competitor systems? +
Premium systems offer 95%+ AFUE, quieter operation, and tighter quality control. This unit sacrifices 15 percentage points of heating efficiency for dramatic price reduction. Choose based on climate and priority, heating efficiency matters more in cold zones.
What if something breaks after year five? +
The 10-year warranty covers defects, but extended service plans are recommended after year five. Many homeowners purchase additional coverage around year seven or eight as parts failure risk increases slightly.

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