Independent Review · Updated June 2026

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

Solid mid-tier gas furnace and AC combo with proven Goodman reliability and reasonable efficiency

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
4 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow
Current Price
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// Bottom Line
This system works well for homeowners replacing older equipment who want dependable performance without premium pricing. The 80% AFUE furnace and 14 SEER air conditioner deliver balanced heating and cooling for most climates, backed by Goodman's solid track record.

Review

The Goodman 4 ton gas furnace and air conditioner system represents the practical middle ground in residential HVAC equipment. This downflow configuration delivers 100,000 BTU of heating and 48,000 BTU of cooling capacity using proven Goodman components. The system is engineered for straightforward installation and moderate operating costs, making it attractive to homeowners who've deferred replacement on aging equipment. Goodman maintains strong market presence among contractors due to reasonable pricing and reliable performance across diverse climates.

Performance metrics reveal a solid but not exceptional unit. The 80% AFUE furnace efficiency means 20 cents of every heating dollar goes up the flue, compared to just 5 cents with high-efficiency alternatives. The 14 SEER air conditioner performs adequately for summer cooling in most regions, though two-stage condensers in similar price ranges deliver better efficiency. The two-stage burner and multi-speed blower provide comfort improvements over basic single-stage equipment. The 74 dB noise level registers noticeably louder during operation compared to premium systems.

Pros & Cons

Pros

  • Two-stage burner on furnace provides better modulation and comfort than single-stage alternatives
  • 14 SEER cooling efficiency is respectable for mid-range equipment, translating to moderate energy bills
  • 100,000 BTU heating capacity handles most residential homes requiring 3-5 ton systems
  • Multi-speed blower motor reduces noise and improves temperature consistency throughout the home
  • 10-year warranty with online registration gives reasonable protection against manufacturer defects
  • Downflow configuration offers installation flexibility in attics, basements, or closets

Cons

  • 80% AFUE is below modern standards, missing potential savings that 95%+ AFUE systems deliver
  • Single-stage condenser limits cooling efficiency compared to two-stage units in the same price range
  • 74 dB noise level is louder than premium models, which may concern noise-sensitive homeowners
  • Not Energy Star certified, indicating it meets minimum standards rather than exceeding them
  • R22 refrigerant option creates future maintenance concerns as the industry phases out R22

Who Should Buy

Best For

Budget-conscious homeowners replacing 15-20 year old systems who prioritize reliability over cutting-edge efficiency. Contractors installing straightforward replacements in moderate climates where extreme heating or cooling demands aren't a primary concern.

Consider Alternatives If

Anyone in cold climates needing maximum heating efficiency or homeowners planning to stay 15+ years who want superior long-term energy savings should look at 95%+ AFUE furnaces instead.

4 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Fur
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Installation

Installation requires metal exhaust flue for safe gas venting and standard 208/230V single-phase 60 Hz electrical service. The downflow configuration needs adequate clearance, typically working in attics, basements, or dedicated closets. Technicians must size the condensate line properly and ensure correct refrigerant charge for either R410A or R22. Most qualified HVAC contractors complete installation in one day, though ductwork modifications may extend timelines.

Warranty & Reliability

The 10-year parts warranty with online registration provides decent protection against manufacturing defects but requires proof of registration within 30 days of purchase. Coverage is limited to parts replacement, with labor typically excluded. This warranty is standard in the mid-range segment, offering peace of mind for common failures but requiring owner diligence for activation.

Specifications

SKULS38783830
Brand/ManufacturerOnline Supply
Cooling BTU48,000
Heating BTU100,000
RefrigerantR410A or R22
Electrical208 / 230 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)74
Weight (in lbs)30.000000
FeatureSpec
Exhaust Flue RequirementMetal
Furnace Efficiency / AFUE80%
Blower MotorMulti-Speed
Maximum CFM2000
ConfigurationUpflow / Downflow
Burner StagesTwo
Fuel TypeGas
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.
Energy StarNo
SEER1 (Efficiency)14
Condenser StagesSingle Stage
Compressor TypeScroll
Liquid Valve Size3/8"
Suction Valve Size7/8"
Max Breaker Size45 amps
Min. Breaker Size26.4 amps
Tonnage5 Ton
Liquid Line3/8"
Suction Line7/8"
StyleA-Coil
Suction Line Insulation Thickness3/8"
Length30 feet

Frequently Asked Questions

Why does this system show both 4 ton and 5 ton ratings? +
The title lists 4 ton cooling, but specifications indicate 5 ton tonnage. This discrepancy suggests the 48,000 BTU cooling capacity falls between standard sizes. Verify actual tonnage with your installer, as this affects ductwork sizing, airflow expectations, and system pairing compatibility.
Can I install this myself or do I need a licensed technician? +
You need a licensed HVAC technician. Gas furnaces require proper venting, electrical work, and refrigerant handling that violates building codes if installed without certification. DIY installation voids warranty and creates safety hazards including carbon monoxide exposure.
How much will my heating bills be with 80% AFUE? +
At 80% AFUE, expect roughly 20% higher heating costs than 95% AFUE systems. For a $1,200 annual heating bill, upgrading to 95% AFUE saves approximately $240 yearly. Over 15 years, that totals $3,600 in savings, often justifying higher upfront cost.
How does this compare to a 16 SEER Lennox system? +
The Lennox 16 SEER delivers roughly 14% better cooling efficiency than this 14 SEER unit, lowering summer energy costs. The trade-off is typically higher purchase price. For moderate climates with mild summers, the 2 SEER difference results in modest annual savings under $150.
What does the 10-year warranty actually cover? +
The warranty covers manufacturer defects in parts like the compressor, motor, and heat exchanger when registered online within 30 days. Labor and refrigerant are excluded. Coverage requires proper installation and maintenance per Goodman specifications.

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