Independent Review · Updated June 2026

3 Ton 18 SEER 96% AFUE 120,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow

High-efficiency two-stage system with 18 SEER and 96% AFUE at aggressive pricing

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3 Ton 18 SEER 96% AFUE 120,000 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 works best for homeowners in mixed climates seeking balanced heating and cooling efficiency without premium brand markup. The 96% AFUE furnace and 18 SEER condenser deliver real energy savings, making it ideal for moderate-sized homes where operational costs matter.

Review

This Goodman system from Online Supply positions itself as a value play in the efficient HVAC market. The combination of 18 SEER cooling and 96% AFUE heating appeals to budget-conscious homeowners and contractors tired of premium brand pricing. At $89, the equipment cost alone is extremely competitive, though final installed pricing will depend on refrigerant choice, ductwork modifications, and local labor rates. The AHRI certificate number 7368842 confirms matched component testing and eligibility for utility rebates.

Performance metrics here are genuinely strong. The 96% AFUE furnace converts nearly all natural gas or propane into usable heat, representing a 6-16 percent efficiency jump over older equipment. The air conditioning side delivers 18 SEER through a two-stage scroll compressor and variable-speed ECM blower rated for 2,000 CFM maximum airflow. Two-stage operation on both heating and cooling allows the system to run at reduced capacity during mild weather, cycling less frequently and reducing noise to 71 dBA. This modulation approach improves comfort and extends compressor lifespan.

Pros & Cons

Pros

  • 18 SEER rating meets modern efficiency standards and qualifies for Energy Star rebates in many states
  • 96% AFUE furnace captures nearly all fuel energy, reducing heating costs compared to 80-90% baseline equipment
  • Two-stage compressor and two-stage burners modulate capacity for quieter, more stable operation at 71 dBA
  • Variable-speed ECM blower motor adjusts to actual heating and cooling demand, improving comfort and reducing utility bills
  • Scroll compressor design runs cooler and lasts longer than reciprocating alternatives

Cons

  • Specs show conflicting tonnage information, listing both 3 Ton and 5 Ton, creating uncertainty about actual capacity
  • 35,000 cooling BTU on a 5-ton unit is undersized compared to industry standards of 60,000+ BTU for that tonnage
  • Limited details on installation complexity, piping requirements, and whether indoor coil upgrades are needed

Who Should Buy

Best For

Homeowners upgrading from 14-15 SEER single-stage systems who want measurable energy savings. Contractors working in service areas offering Online Supply or rebate programs will appreciate the $89 entry price and AHRI certification (7368842).

Consider Alternatives If

Anyone requiring a true 5-ton system should verify actual cooling capacity before purchasing, as the listed 35,000 BTU appears inconsistent with that classification.

3 Ton 18 SEER 96% AFUE 120,000 BTU Goodman Gas Fur
$89
Buy at HVACDirect →

Installation

Installation requires 115V single-phase 60Hz power with breaker sizing between 21.3 and 35 amps. Suction and liquid lines connect via sweat valves using 3/4-inch and 3/8-inch ports respectively, with 50 feet of pre-insulated suction line included. Upflow and horizontal configurations support most single-family homes, though downflow capability provides flexibility. PVC or plastic exhaust flue compatibility simplifies venting. Existing ductwork evaluation is essential before purchase.

Warranty & Reliability

10-year coverage applies when you complete Online Supply registration after purchase. This warranty protects against manufacturing defects in sealed components and electrical parts. Evaporator coil coverage extends separately under Goodman's published terms. Registration takes 10 minutes online and significantly impacts your protection window, so do not skip this step.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU120,000
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"
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 Number7368842
Airflow DirectionUpflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Furnace Efficiency / AFUE96%
Blower MotorVariable Speed - ECM
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 this really a 3-ton or 5-ton system? +
Specs conflict here, listing both 3 Ton and 5 Ton tonnage. The 35,000 cooling BTU output does not align with either rating. Contact Online Supply directly to confirm actual cooling capacity before committing. This discrepancy suggests a potential data entry error in the product listing.
What refrigerant should I choose, R410A or R22? +
Select R410A. This newer refrigerant works with modern compressor oils, has better environmental ratings, and performs reliably in current systems. R22 is primarily offered for retrofit applications on legacy equipment. Goodman optimizes this system for R410A operation.
How much will this system reduce my heating and cooling bills? +
A 96% AFUE furnace reduces heating costs by roughly 10-16 percent versus 80-90% equipment. The 18 SEER unit cuts cooling costs by 20-30 percent compared to 13-14 SEER systems. Actual savings depend on climate, insulation, and usage patterns. Energy Star rebates often recover $500-1,500 of the equipment cost.
Can I install this myself or do I need a licensed contractor? +
Hire a licensed HVAC contractor. This system involves refrigerant handling, electrical work, gas connections, and venting that require EPA certification, local permits, and warranty compliance. Professional installation costs $3,000-6,000 typically, but protects your investment and guarantees proper performance.
Does the 10-year warranty cover everything? +
The 10-year warranty covers manufacturing defects in compressor, coils, and electrical components when you register online. It does not cover installation errors, user neglect, or refrigerant charging. Review the full warranty terms and maintain annual maintenance to preserve coverage.

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