3.5 Ton 15 SEER 80% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman system targets budget-conscious homeowners and contractors who need a straightforward, proven combo unit without premium pricing. At $2,071, it delivers adequate heating and cooling for mid-sized homes in moderate climates, though efficiency ratings lag behind higher-tier alternatives.

Review

Goodman's 3.5-ton combo system represents the value tier of residential HVAC, targeting price-sensitive buyers and budget-conscious contractors. At $2,071, this upflow-capable unit bundles furnace and air conditioning in one SKU (LS381183850), simplifying ordering and installation coordination. The system carries Goodman's reputation for straightforward, no-frills equipment, backed by an AHRI certificate (204633307) confirming matched component performance. It's not cutting-edge, but it's proven technology.

Performance specs reveal an 80% AFUE furnace with 80,000 BTU heating capacity and two-stage burners that ramp between low and high fire for part-load efficiency. The cooling side delivers 42,000 BTU (3.5 tons) with 15 SEER efficiency and a scroll compressor running R410A refrigerant. Variable-speed blower circulates 2,000 CFM maximum through the A-coil, allowing modulation in mild weather. These numbers are respectable but not exceptional, trailing 90%+ AFUE furnaces and 16-18 SEER units in the marketplace by 2-3 efficiency tiers.

Pros & Cons

Pros

Excellent price-to-performance ratio at $2,071 for a complete 3.5-ton system
80% AFUE furnace with dual-stage burners provides responsive heating with reasonable efficiency
Variable-speed blower motor (2000 CFM max) improves comfort and reduces energy waste
ENERGY STAR certified with 15 SEER cooling rating for respectable seasonal efficiency
10-year warranty with online registration covers parts and labor peace of mind
Scroll compressor and R410A refrigerant deliver reliable, established technology

Cons

80% AFUE is dated, mid-tier standard, missing high-efficiency 90%+ options
15 SEER2 is entry-level by today's standards, higher SEER ratings available elsewhere
Single-stage condenser limits part-load efficiency and cycling noise (73 dBA) in mild weather
Spec sheet shows conflicting tonnage data (3.5 ton vs 5 ton listed), requiring clarification before purchase

Who Should Buy

Best For

Homeowners in HVAC replacement situations who prioritize upfront affordability over long-term efficiency savings, and contractors equipping rental properties or flips where ROI timelines are short. This system makes sense in moderate climates where extreme seasonal demands don't occur.

Consider Alternatives If

Anyone in high-heat regions needing robust cooling, environmentally-focused buyers pursuing minimum 16 SEER2, or homeowners planning to stay 15+ years and recoup efficiency investments.

3.5 Ton 15 SEER 80% AFUE 80,000 BTU Goodman Gas Fu

$2071

Buy at HVACDirect →

Installation

Upflow configuration suits basements and utility closets, requiring 208-230V single-phase 60Hz power with a 23.5 to 40 amp breaker. Dimensions are compact (30 inches high, 24.5 wide, 21 deep), fitting most confined spaces. Refrigerant lines (3/8 inch liquid, 1 1/8 inch suction) ship with 50 feet of insulation pre-wrapped at 1/2 inch thickness, reducing field labor. Metal exhaust flue required, typical for gas furnaces.

Warranty & Reliability

The 10-year parts and labor warranty activates upon online registration, providing solid coverage for the investment. This aligns with industry standard for mid-tier equipment. Goodman's warranty administration is straightforward, though actual claim processing timelines vary by regional dealers. Extended warranties are sometimes available at purchase but rarely cost-effective given this product's lifespan and replacement cycles.

Specifications

SKU	LS381183850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	80,000
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
AHRI Certificate Number	204633307
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	24.5"
Depth	21"
Resources	CAPF Installation Manual CAPF 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.
Energy Star	Yes
SEER1 (Efficiency)	16
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	7/8"
Max Breaker Size	40 amps
Min. Breaker Size	23.5 amps
Tonnage	5 Ton
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

Does this system qualify for rebates or tax credits? +

ENERGY STAR certification opens some utility rebate eligibility, but 80% AFUE and 15 SEER miss high-efficiency tax credits in most jurisdictions. Check your local utility and IRS requirements. Rebates typically range $200-$500 for ENERGY STAR units, insufficient to bridge the gap to premium models.

Can I convert this from upflow to downflow installation? +

Yes, the spec sheet lists upflow/downflow configuration capability, but conversion requires repositioning the unit and refrigerant lines. Consult the CAPF installation manual (available in resources) before attempting this, as improper orientation affects blower performance and A-coil drainage.

How does 15 SEER compare to newer units? +

15 SEER meets minimum federal standards but trails current mid-range units at 16-18 SEER2. Over 15 years, a 16 SEER system saves approximately $400-$600 in cooling energy versus this unit, depending on climate and usage. The payback depends on your regional electricity rates.

Is the 80% AFUE furnace adequate for cold climates? +

80% AFUE works in moderate climates but underperforms in harsh winters. Northern states benefit from 90%+ AFUE units that reduce heating bills 10-15% annually. If winter lows drop below 0 degrees F regularly, consider upgrading to high-efficiency alternatives.

What does the 10-year warranty actually cover? +

Parts and labor are covered for 10 years with registration. Covers defects in materials and workmanship. Does not cover misuse, improper installation, or routine maintenance like filter changes and refrigerant top-offs.

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