4 Ton 13 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system works best for homeowners upgrading older equipment in moderate climates who want reliable heating and cooling without premium pricing. It's a practical choice for contractors needing a dependable workhorse unit that meets standard efficiency codes.

Review

The Goodman 4-ton gas furnace and air conditioner system represents a mainstream choice in the mid-market HVAC segment. Manufactured by a company with decades of commercial and residential presence, this upflow unit combines straightforward engineering with proven reliability. At its price point, it competes directly with entry-level units from Lennox and Carrier, appealing to homeowners and contractors who prioritize function over premium features.

Performance metrics reveal a solid, if unspectacular, offering. The furnace delivers 100,000 BTU through two burner stages, achieving 80% AFUE efficiency, which was competitive 10 years ago but lags modern 92-95% models. The air conditioning side produces 48,000 BTU with 13 SEER rating using R410A refrigerant and a reciprocating compressor. The variable-speed blower reaches 2,000 CFM maximum, optimizing airflow in properly sized ducts. Operation at 76 dB is moderately loud, noticeable in quiet residential settings.

Pros & Cons

Pros

Two-stage burner delivers 100,000 BTU heating output with 80% AFUE efficiency for solid performance in cold months
Variable-speed blower motor adjusts airflow up to 2,000 CFM for even temperature distribution throughout the home
13 SEER cooling efficiency paired with 4-ton capacity handles moderate cooling loads cost-effectively
Dual fuel capability, accepting both natural gas and propane for flexible installation options
10-year warranty with online registration provides reasonable long-term protection against defects
Compact 30 by 21 by 21 inch footprint fits standard closets and utility spaces

Cons

80% AFUE is dated by modern standards, with high-efficiency models now reaching 95% or higher
13 SEER rating lacks Energy Star certification, meaning higher cooling energy bills versus 16+ SEER alternatives
Single-stage condenser cannot modulate cooling capacity, cycling on and off rather than running efficiently at partial load
76 dB operating noise level is audible, potentially noticeable in quieter homes or near living areas

Who Should Buy

Best For

Homeowners in moderate climates seeking a budget-friendly replacement for 15+ year old systems will appreciate the balance between cost and performance here. Contractors installing in rental properties or fix-and-flip projects benefit from the reliability and lower upfront investment.

Consider Alternatives If

Skip this if you live in a very cold climate, operate year-round cooling, or want to minimize utility bills, since more efficient models will deliver faster payback.

4 Ton 13 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

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Installation

This upflow configuration fits standard basement and closet installations. The unit requires 208 to 230 volt single-phase power with 26.3 to 45 amp breaker sizing, typical for residential circuits. Metal flue exhaust venting is mandatory. Standard field connections include 3/8 inch liquid line, 1 1/8 inch suction line with 1/2 inch insulation, and sweat-type valve connections. Most licensed HVAC technicians complete installation in one working day.

Warranty & Reliability

Goodman provides 10 years of parts coverage upon online registration, a reasonable protection period against manufacturing defects and component failure. This covers the compressor, motors, and heat exchanger. Coil warranty extends separately. Homeowner registration is straightforward and required to activate full coverage. Labor and refrigerant are typically excluded.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	48,000
Heating BTU	100,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	76
Weight (in lbs)	48.000000
Feature	Spec
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	CAPT Installation Manual CAPT Specifications Sheet Goodman Evaporator Coil Warranty You will need Adobe® Acrobat® Reader to view PDF documents.
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.
Replaces	GSX130483, GSX130484, GSX130485
Energy Star	No
SEER1 (Efficiency)	13
Condenser Stages	Single Stage
Compressor Type	Reciprocating
Liquid Line	3/8"
Suction Line	1 1/8"
Liquid Valve Size	3/8"
Max Breaker Size	45 amps
Min. Breaker Size	26.3 amps
Tonnage	5 Ton
Valve Type	Sweat
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

What's the actual heating capacity and how does 80% AFUE compare to newer furnaces? +

This unit outputs 100,000 BTU through dual-stage burners at 80% AFUE, meaning 80% of fuel energy becomes usable heat. Modern condensing furnaces achieve 95% AFUE, converting nearly all fuel to heat. A 95% unit saves roughly 15-20% on heating costs annually. Choose this if budget matters more than long-term operating efficiency.

Will this cool a 2,000 square foot house adequately? +

The 4-ton capacity equals 48,000 BTU cooling output at 13 SEER. For 2,000 square feet in moderate climates, this typically suffices, assuming proper insulation and ductwork. In hot, humid regions, you might need 5 tons. A professional load calculation confirms proper sizing for your specific location.

Can I use this with propane instead of natural gas? +

Yes. The unit accepts both natural gas and propane, though initial setup requires converting the burner nozzles and ensuring proper pressure regulation. A technician must perform this conversion. It's ideal for rural homes without natural gas access, though propane typically costs more per BTU than natural gas.

How does 13 SEER compare to Energy Star models I've seen? +

Energy Star requires 14.5+ SEER for most regions. At 13 SEER, this unit misses that threshold. You'll pay roughly 10-15% more in annual cooling energy versus a 16 SEER model. The tradeoff is lower purchase price. Higher efficiency pays off in 8-12 years through reduced utility bills.

Does the 10-year warranty cover labor or just parts? +

The warranty covers parts only, not labor or refrigerant. Online registration is mandatory to activate it. This is standard across the industry. Budget separately for service calls and technician time if repairs occur after the first year of manufacturer's labor coverage.

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