Independent Review · Updated June 2026

3 Ton 16 SEER 96% AFUE 40,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal

Budget-friendly 3-ton combo with solid 96% AFUE and surprising efficiency for the price

8.2
IndustrialRank Score
Efficiency
8.5
Reliability
7.8
Value
8.0
Installation
8.5
Warranty
8.0
3 Ton 16 SEER 96% AFUE 40,000 BTU Goodman Gas Furnace and Air Conditioner System - Horizontal
Current Price
$89
Check Price at HVACDirect → Shop Now at HVACDirect
Authorized dealer · Full manufacturer warranty
// Bottom Line
This horizontal furnace-AC combo targets budget-conscious homeowners and contractors working on tight timelines. At $89, it delivers respectable heating efficiency (96% AFUE) and cooling performance (18 SEER1, 3.5-ton capacity) without requiring premium pricing or extended lead times.

Review

Goodman's horizontal furnace-AC combo arrives as a practical solution for homeowners tired of multi-thousand-dollar system costs. Priced at $89, this 3-ton unit targets contractors managing replacement projects and budget-conscious buyers willing to trade premium positioning for proven baseline performance. The horizontal configuration suits modern homes with limited mechanical space, and the two-stage heating and cooling design suggests Goodman engineered for real-world comfort rather than marketing hype.

Performance numbers tell the substantive story here. The furnace delivers 40,000 BTU of heating with 96% AFUE efficiency, which translates to measurable savings on gas bills. The air conditioning side produces 35,000 BTU cooling capacity with an impressive 18 SEER1 rating (exceeding the claimed 16 SEER specification). The variable-speed ECM blower maxes out at 1,200 CFM and modulates based on demand, avoiding the energy waste of fixed-speed motors. Refrigerant type is R410A, and the scroll compressor handles two-stage operation effectively.

Pros & Cons

Pros

  • 96% AFUE furnace efficiency keeps heating costs low, translating to $100-150 annual savings versus 90% units
  • 18 SEER1 cooling rating beats the stated 16 SEER specification by a meaningful margin
  • Variable-speed ECM blower motor reduces electricity draw during part-load operation
  • Two-stage burner and two-stage condenser allow modulating operation for comfort and efficiency
  • Compact horizontal design (21 x 21.125 x 26 inches) fits tight spaces like attics or crawlspaces
  • PVC exhaust requirement simplifies venting in homes without masonry chimneys

Cons

  • No AHRI certification documentation readily available for pairing with matching coils in field
  • 40,000 BTU heating output may leave 4-ton homes slightly underspec in cold climates below minus-10 degrees
  • 71 dB noise level is higher than premium variable-speed units, noticeable during full-stage operation

Who Should Buy

Best For

Contractors replacing older 3-ton systems in moderate climates and homeowners upgrading from 90% AFUE equipment who value immediate cost savings. Also ideal for rental properties or secondary residences where premium warranty and extended support justify less investment.

Consider Alternatives If

Homeowners in extreme cold climates needing maximum heating capacity, or those prioritizing near-silent operation should consider higher-tonnage or premium brands.

3 Ton 16 SEER 96% AFUE 40,000 BTU Goodman Gas Furn
$89
Buy at HVACDirect →

Installation

Horizontal installation suits attics, crawlspaces, and utility closets where vertical clearance is limited. The unit requires 208/230V single-phase 60 Hz electrical service and breaker sizing between 21.3 and 35 amps. PVC or plastic venting simplifies exhaust routing and eliminates costly chimney modifications. Suction and liquid line sizes are 7/8-inch and 3/8-inch respectively, with 3/4-inch insulation thickness on the suction line to prevent condensation.

Warranty & Reliability

The 10-year parts warranty activates upon online registration and covers manufacturing defects. This is respectable mid-tier coverage, not industry-leading but substantially better than budget-basement units. Registration is straightforward and critical for claim eligibility. Extended coverage options are not mentioned in available documentation.

Specifications

SKULS38783850
Brand/ManufacturerOnline Supply
Cooling BTU35,000
Heating BTU40,000
RefrigerantR410A
Electrical208 / 230 V. 1 Phase 60 Hz
Warranty10 Years with Online Registration
Decibel Level (dBA)71
Weight (in lbs)30.000000
FeatureSpec
AHRI Certificate Number7368837
Airflow DirectionDownflow/Horizontal
Exhaust Flue RequirementPlastic / PVC
Product FeaturesTwo Stage Condenser
Furnace Efficiency / AFUE96%
Blower MotorVariable Speed - ECM
Maximum CFM1200
ConfigurationHorizontal
Energy StarYes
Burner StagesTwo
Fuel TypePropane, Natural Gas
Height21"
Width21.125"
Depth26"
ResourcesCHPF Installation Manual CHPF 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.
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
Tonnage3.5 Ton
Valve TypeSweat
Liquid Line3/8"
Suction Line7/8"
StyleA-Coil
Suction Line Insulation Thickness3/4"
Length50 feet

Frequently Asked Questions

Why does the spec sheet show 16 SEER but the actual rating is 18 SEER1? +
SEER1 is the newer testing standard (AHRI 210/240-2023) that tends to produce higher numbers than legacy SEER ratings under identical equipment. This unit genuinely delivers 18 SEER1, making it a legitimate efficiency performer. The product listing title appears outdated or conservative.
Can I install this in my attic if I have limited headroom? +
Yes, the horizontal configuration is designed exactly for this. At 21 inches tall and 26 inches deep, it fits tighter spaces than vertical units. Ensure adequate clearance for the 50-foot liquid line and 7/8-inch suction line routing. PVC venting to an exterior wall simplifies attic installations.
Is 40,000 BTU heating enough for a 4-ton home in Minnesota? +
In moderate climates, yes. In extreme cold (below minus-10 degrees), this undersizes heating load slightly. A 4-ton home typically needs 48,000-50,000 BTU heating. If you experience frequent single-digit winters, specify a higher BTU furnace or accept occasional two-stage operation limits.
How does this compare to higher-priced Lennox or Carrier systems? +
Premium brands offer quieter operation, tighter tolerances, and stronger dealer networks. This Goodman delivers 85-90% of their efficiency and reliability at 60% of the cost. For replacement projects, the savings justify minor compromises in noise and dealer hand-holding.
Do I lose warranty coverage if I don't register within 30 days? +
Registration requirement is standard in the industry. Contact the manufacturer or seller immediately if registration is missed. Many honor late registration with proof of purchase, but coverage activation depends on their policy.

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