Independent Review · Updated June 2026

3 Ton 17 SEER 96% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow

High-efficiency two-stage system with 96% AFUE and 18 SEER1 at exceptional value

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3 Ton 17 SEER 96% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow
Current Price
$89
Check Price at HVACDirect → Shop Now at HVACDirect
Authorized dealer · Full manufacturer warranty
// Bottom Line
This is an excellent choice for homeowners upgrading from older systems or contractors seeking reliable equipment at competitive pricing. The combination of 96% heating efficiency and 18 SEER1 cooling makes it ideal for moderate to hot climates where both seasons matter.

Review

This Goodman system represents the practical middle ground for residential HVAC upgrades. It combines a high-efficiency 80,000 BTU furnace with variable-capacity cooling into one affordable package. The two-stage design on both heating and cooling sides allows the system to run at partial capacity during milder weather, reducing energy waste. At $89 (likely a condenser unit price), it's positioned well against competitors offering 16-17 SEER alternatives. The Energy Star certification backs up the efficiency claims.

The furnace delivers 96% AFUE efficiency, meaning 96 cents of every energy dollar heats your home instead of venting waste. The cooling side achieves 18 SEER1 efficiency with a scroll compressor and two-stage operation, handling 35,000 BTU at full capacity. The variable-speed ECM blower motor runs from 0 to 1600 CFM, adapting to demand throughout the day. Two-stage operation means the system avoids constantly cycling on and off, creating more stable temperatures and lower utility bills. Propane and natural gas compatibility gives installation flexibility.

Pros & Cons

Pros

  • 96% AFUE furnace efficiency reduces heating costs significantly compared to 80-85% systems
  • 18 SEER1 rating (higher than advertised 17 SEER) delivers strong cooling performance per the specs
  • Two-stage burner and two-stage compressor allow for modulating operation and quieter, more efficient part-load performance
  • Variable-speed ECM blower motor adjusts airflow from 0 to 1600 CFM for improved comfort and efficiency
  • Energy Star certified with 10-year warranty when registered online
  • Two-stage scroll compressor design is proven durable and quieter than single-stage alternatives

Cons

  • Spec sheet lists conflicting tonnage (3 ton in title, 5 ton in specifications), which creates confusion about actual capacity
  • 71 dB noise level is moderately loud, particularly noticeable during high-speed cooling cycles
  • Requires proper electrical setup with 21.3 to 35 amp breaker, adding installation complexity for some homes

Who Should Buy

Best For

Homeowners in mixed or warm climates replacing 15+ year old equipment will see immediate utility savings from the high efficiency ratings. Contractors installing multiple units appreciate the proven Goodman reliability and straightforward two-stage design at this price point.

Consider Alternatives If

Those prioritizing whisper-quiet operation or living in mild climates where cooling rarely runs should explore single-stage units. Budget buyers needing the absolute lowest entry cost should compare basic 14 SEER systems.

3 Ton 17 SEER 96% AFUE 80,000 BTU Goodman Gas Furn
$89
Buy at HVACDirect →

Installation

This downflow A-coil configuration suits basements and utility closets where upward ducting isn't feasible. Installation requires 115V, 60Hz single-phase power with a 21.3 to 35 amp breaker. The system uses standard 3/8 inch liquid and 7/8 inch suction lines with 3/4 inch insulation included. PVC exhaust venting is required for the furnace. Proper refrigerant charging and electrical wiring are essential, so professional installation is strongly recommended.

Warranty & Reliability

Online Supply offers a 10-year parts warranty when you register the unit online after purchase. This covers compressor, heat exchanger, and coil defects. Labor and refrigerant are typically not included. Registration is straightforward and protects your investment. Ten years is competitive for mid-range equipment, though some premium manufacturers extend to lifetime compressor coverage.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU80,000
RefrigerantR410A or R22
Electrical115 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)71
Weight (in lbs)30.000000
FeatureSpec
Product FeaturesRebate Available
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.
AHRI Certificate Number7368843
Airflow DirectionDownflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Furnace Efficiency / AFUE96%
Blower MotorVariable Speed - ECM
Maximum CFM1600
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

What's the actual tonnage of this system, 3 ton or 5 ton? +
The specifications list conflicting information, but the 35,000 BTU cooling capacity indicates approximately 2.9 tons, suggesting this is marketed as a 3-ton unit. Contact the manufacturer with the SKU LS38783850 to confirm before ordering. The discrepancy should be clarified before installation planning.
Can I install this in an attic downflow configuration? +
Yes, the downflow/horizontal configuration is designed for attic or basement placement. Ensure adequate support for the 30 pound weight, proper clearance around the unit for service access, and secure ductwork connections. PVC exhaust venting must route safely outside. Professional installation is recommended to ensure proper refrigerant lines and electrical connections.
How much will this system reduce my heating and cooling costs? +
Upgrading from a 78% AFUE furnace and 13 SEER unit could save 15-25% on heating and cooling bills annually, depending on climate and usage. The 96% AFUE and 18 SEER1 ratings are both above regional efficiency standards. Actual savings vary by utility rates, insulation, and thermostat settings. Energy Star certification estimates vary by location.
How does this compare to Lennox or Carrier models in the same price range? +
Goodman competes well on efficiency ratings and cost, though some Carrier models offer quieter operation. Lennox typically commands premium pricing for similar SEER ratings. This system's two-stage design and variable blower match or exceed most competitors at this price point. Reliability across brands is comparable when properly installed and maintained.
Is the 10-year warranty worth the online registration hassle? +
Yes. Registration takes minutes and unlocks decade-long protection against compressor and coil failures. Skipping registration voids coverage, which could cost $1,500+ if defects appear in year two. Keep documentation and complete registration immediately after installation to ensure coverage.

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