4 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Heat Pump System - Upflow Review 2026

// Bottom Line

This Goodman system works best for homeowners upgrading from older single-stage units who want measurable efficiency gains without premium pricing. The 80% AFUE furnace and 18 SEER2 heat pump deliver real energy savings, especially in mixed climates where both heating and cooling run regularly.

Review

The Goodman 4-ton gas furnace and heat pump system represents a practical middle ground in the residential HVAC market. Manufactured by Online Supply under the Goodman brand, this upflow-configured unit delivers 47,000 BTU for both heating and cooling modes. It's designed for contractors and homeowners who need dependable performance at accessible price points without sacrificing the efficiency gains available in modern equipment. The two-stage design separates it from basic single-stage competitors.

Performance metrics reveal a capable but conservative unit. The furnace achieves 80% AFUE, modest by today's standards but adequate for temperate climates. The cooling side delivers 18 SEER2 efficiency with a two-stage scroll compressor and two-stage condenser, earning ENERGY STAR qualification. At 5 tons actual capacity, the unit handles a 2000 CFM maximum airflow via variable-speed blower motor. Electrical requirements stay reasonable at 208-230V single-phase, needing between 29.3 and 50 amp service.

Pros & Cons

Pros

Two-stage burner and condenser provide modulating comfort and lower operating noise at 73 dBA
18 SEER2 rating with ENERGY STAR qualification beats baseline efficiency significantly
Variable-speed blower motor maxes at 2000 CFM for balanced airflow across ductwork
Compact footprint at 30 inches tall fits standard upflow and downflow installations
10-year warranty with online registration covers parts and compressor adequately

Cons

80% AFUE is mid-range, not high-efficiency like 95%+ modulating furnaces available today
Dual refrigerant compatibility (R410A or R22) may complicate future service availability as R22 phases out
73 dBA decibel level registers noticeably louder than premium variable-speed models under full load

Who Should Buy

Best For

Contractors installing systems for residential retrofits where budget matters but efficiency upgrades are necessary. Homeowners in moderate climates upgrading 10-15 year old equipment who want reliable two-stage operation without financing premium-tier equipment.

Consider Alternatives If

Anyone in harsh northern climates needing 95%+ AFUE or seeking the absolute quietest operating systems should explore higher-tier alternatives.

4 Ton 17 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

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Installation

Installation demands standard HVAC practices. The upflow orientation suits basement or closet placement in typical homes. Metal flue exhaust requirement means proper venting to exterior, non-negotiable for safety and code compliance. Refrigerant lines use standard 3/8 inch liquid and 1 1/8 inch suction sizing with half-inch insulation thickness. Pre-formed 50-foot suction line comes included, reducing field fabrication work and speeding rough-in.

Warranty & Reliability

Goodman backs this unit with 10 years parts coverage when you register online, a customer-friendly requirement that most owners complete easily. The scroll compressor receives additional evaporator coil warranty protection. Ten years falls short of premium manufacturers offering longer coverage, but matches industry standards for this equipment tier and provides solid peace of mind.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	47,000
Heating BTU	47,000
Refrigerant	R410A or R22
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	48.000000
Feature	Spec
Safety Information	PROPOSITION 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.
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Variable Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Height	30"
Width	21"
Depth	21"
Resources	CAPF Installation Manual CAPF Specifications Sheet Goodman Evaporator Coil Warranty You will need Adobe® Acrobat® Reader to view PDF documents.
Product Features	Rebate Available, Two Stage Condenser
Energy Star	Yes
SEER1 (Efficiency)	18
Condenser Stages	Two Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	1 1/8"
Max Breaker Size	50 amps
Min. Breaker Size	29.3 amps
Tonnage	5 Ton
Valve Type	Sweat
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

What's the practical difference between 80% AFUE and 95% AFUE furnaces? +

An 80% AFUE furnace converts four-fifths of fuel energy to heat, losing 20% up the flue. At 95% AFUE, you lose only 5%, delivering 15% more heating from the same gas input. Over 20 years, that difference amounts to significant utility savings in cold climates, though temperate regions see smaller payback periods.

Can this system use existing ductwork from my old furnace? +

Likely yes, if your current system handles 2000 CFM or higher airflow. The variable-speed blower adapts to ductwork resistance automatically. Have an HVAC contractor verify duct sizing and seal leaks before installation. Oversized ducts waste air movement, while undersized ducts restrict airflow and reduce efficiency gains.

How does 18 SEER2 compare to older heat pump systems? +

Older units from 2005-2010 typically ran 10-13 SEER. This system's 18 SEER2 rating means 30 to 40 percent lower cooling energy consumption. Real-world savings depend on your climate and usage patterns, but upgrading from a 13 SEER unit usually pays for efficiency improvements within 7-10 years.

Should I worry about the R22 refrigerant compatibility? +

R22 production ends in 2030. If your system uses R22 and requires future repairs, refrigerant will become expensive. The unit supports R410A, the modern standard through 2024. Specify R410A during installation unless constraints force otherwise, ensuring long-term service cost predictability.

Is the 10-year warranty sufficient? +

Ten years covers most residential system lifespans well. Registration is required, a simple online step. Major components fail rarely within this period if properly maintained. Extended warranties beyond ten years are available but often cost more than potential repair expenses.

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