Independent Review · Updated June 2026

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

High-efficiency 3-ton combo system with 18 SEER cooling and solid 80% heating for budget-conscious upgrades.

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 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow
Current Price
$2142
Check Price at HVACDirect → Shop Now at HVACDirect
Authorized dealer · Full manufacturer warranty
// Bottom Line
This Goodman system works best for homeowners replacing aging equipment who want strong efficiency gains without premium pricing. It's particularly suited for moderate climates where the 80% AFUE furnace meets seasonal needs and the 18 SEER condenser handles cooling demands effectively.

Review

This Goodman 3-ton combo system addresses a real market need: reliable, mid-range equipment for homeowners who don't want to spend $4,000+ on a premium unit. The 18 SEER condenser and 80% AFUE furnace represent meaningful efficiency upgrades over equipment from 2010-2015, when 13 SEER and 78% AFUE were standard. At $2,142, the pricing sits squarely in the value segment where contractors and homeowners expect solid performance without unnecessary features.

Performance specs show a two-stage scroll compressor handling 35,000 BTU of cooling capacity at 18 SEER efficiency, while the furnace produces 80,000 BTU across two burner stages at 80% AFUE. The variable-speed blower motor maxes out at 2,000 CFM, allowing finer control than fixed-speed alternatives. Electrical draw runs 120V single-phase at 21.3 to 35 amps, placing it within standard residential service capability. These numbers indicate a capable workhorse rather than top-tier efficiency, appropriate for moderate climates.

Pros & Cons

Pros

  • 18 SEER cooling efficiency reduces summer energy costs by roughly 25% versus older 13 SEER units
  • Two-stage compressor and burner configuration allows the system to modulate output, improving comfort and reducing short-cycling
  • 80% AFUE furnace delivers respectable heating efficiency for a non-condensing unit at this price point
  • Variable-speed blower motor maintains consistent airflow across load conditions, reducing temperature swings
  • 10-year warranty with online registration covers parts and labor on most components

Cons

  • 80% AFUE is adequate but not exceptional, condensing models reach 95%+ AFUE for colder climates
  • 35,000 BTU cooling capacity doesn't match the 80,000 BTU heating capacity, suggesting this is a retrofit bundle rather than factory-matched pair
  • Metal exhaust flue requirement adds installation complexity and cost in some home configurations

Who Should Buy

Best For

Homeowners in moderate climates replacing 10+ year old split systems who prioritize upfront savings and reasonable efficiency gains. This system delivers genuine performance improvement for $2,142 without the premium pricing of higher-tier units.

Consider Alternatives If

Northern climates requiring maximum heating efficiency should look at 90%+ AFUE condensing furnaces, and very hot regions may want larger tonnage to handle peak loads.

3 Ton 18 SEER 80% AFUE 80,000 BTU Goodman Gas Furn
$2142
Buy at HVACDirect →

Installation

Installation requires standard R410A or R22 refrigerant line runs with 3/8 inch liquid and 7/8 inch suction lines, both pre-insulated at 3/4 inch thickness up to 50 feet. The upflow A-coil configuration suits basement or utility closet placement. A metal exhaust flue is mandatory for the furnace, which can complicate retrofits in older homes without proper venting. HVAC contractors should verify existing ductwork can handle 2,000 CFM output.

Warranty & Reliability

Goodman covers parts and labor for 10 years with online registration, which is competitive in this price range. This protects against compressor failure, heat exchanger cracks, and blower motor defects, the three costliest components. Registration is straightforward but required, so confirm the original owner completes this step immediately after installation.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU80,000
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.
AHRI Certificate Number204633302
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 is the cooling capacity 35,000 BTU but the heating is 80,000 BTU? +
This mismatch suggests Online Supply bundles mismatched components rather than selling factory-paired units. The condenser and furnace were sized for different applications. Verify the tonnage matches your home's load calculation before purchase, as the 3-ton rating may not align with actual capacity needs.
Can this system use my existing ductwork and line set? +
Existing ductwork rated for 2,000 CFM maximum should work. However, old line sets often contain incorrect refrigerant or lack proper insulation. HVAC best practices call for replacing all refrigerant lines to ensure proper capacity, avoid cross-contamination, and meet current efficiency standards.
How much will this save on energy bills compared to my 2005 system? +
A properly sized unit running 18 SEER versus an older 10 SEER system reduces cooling costs by approximately 44% in your cooling season. Heating savings at 80% AFUE versus 75% AFUE run roughly 6.7% annually. Actual savings depend on usage patterns and local electricity rates.
Is this better than the Lennox or Carrier equivalent at the same price? +
Goodman competes well at this price tier. Lennox and Carrier command premiums of 15 to 25% for brand reputation and slightly better reliability data. Goodman's 18 SEER and variable-speed components match or beat comparable models from competitors at lower cost.
Do I need to register the warranty immediately after installation? +
Yes. The 10-year parts and labor coverage only applies with online registration. Many contractor failures to register cost homeowners thousands when compressors fail in year three. Have your installer complete this before they leave the job site.

Affiliate disclosure: IndustrialRank earns a commission on qualifying purchases at no extra cost to you. We only recommend products we have independently reviewed.