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

// Bottom Line

This horizontal Goodman system works well for contractors installing in tight spaces where upflow isn't possible, and for homeowners seeking reliable mid-tier efficiency without premium pricing. The 80% AFUE furnace and 15 SEER air conditioner deliver respectable performance at under $2,100.

Review

The Goodman 4-ton horizontal system sits squarely in the contractor sweet spot, offering solid performance without the premium pricing of tier-one brands. At $2,071, this SKU LS38783850 delivers a furnace and air conditioner combo that works equally well for replacement jobs and new construction. Goodman's reputation for durability makes this system attractive to price-conscious contractors and homeowners who value function over brand prestige.

Performance metrics tell a practical story. The furnace produces 80,000 BTU heating capacity with 80% AFUE efficiency and two-stage burner operation, meaning it adjusts output based on actual demand rather than cycling on-off constantly. Cooling delivers 45,500 BTU at 15 SEER using R410A refrigerant and a scroll compressor. The variable-speed blower motor modulates between 0-2,000 CFM, helping maintain comfort while running quieter than fixed-speed alternatives at 73 dBA. ENERGY STAR certification confirms these efficiency gains matter measurably on utility bills.

Pros & Cons

Pros

Two-stage burner reduces short cycling and improves comfort during partial-load operation
Variable-speed blower motor maximizes efficiency and minimizes noise at 73 dBA
ENERGY STAR certified with 80% AFUE and 15 SEER ratings for measurable utility savings
Dual fuel capability runs on natural gas or propane without equipment changes
Lightweight at 30 lbs with compact horizontal design fits challenging installation spaces

Cons

80% AFUE is mid-range, not high-efficiency like 95%+ condensing furnaces
15 SEER cooling lags behind newer 16-18 SEER standards in the market
Single-stage condenser limits part-load cooling efficiency on mild days

Who Should Buy

Best For

Contractors need reliable equipment for horizontal installations in crawlspaces or basements where vertical clearance is limited. Homeowners replacing older 2-3 ton systems on moderate budgets will see tangible efficiency gains with this 80% AFUE furnace.

Consider Alternatives If

Skip this if you need high-efficiency heating above 90% AFUE or if cooling performance at SEER 18+ is a priority.

4 Ton 15 SEER 80% AFUE 80,000 BTU Goodman Gas Furn

$2071

Buy at HVACDirect →

Installation

This horizontal configuration requires metal exhaust flue and fits tight spaces like crawlspaces where vertical furnaces won't fit. Dimensions of 24.5 inches high by 26 inches wide and 21.125 inches deep demand accurate measurements before ordering. Electrical needs are straightforward, 208/230V single-phase 60Hz with breaker requirements between 23.9 and 40 amps. Standard lineset length accommodates 50 feet of refrigerant lines with 3/4-inch suction insulation.

Warranty & Reliability

The 10-year parts warranty requires online registration but covers manufacturing defects across the entire system. Goodman's extended coverage on the evaporator coil provides additional peace of mind. This warranty aligns with industry standards for mid-tier equipment and gives buyers reasonable protection against premature component failure.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	45,500
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)	30.000000
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	Horizontal
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Height	24.5"
Width	26"
Depth	21.125"
Resources	CHPF Installation Manual CHPF 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	GSX16S481
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	23.9 amps
Tonnage	5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Can I switch between natural gas and propane with this furnace? +

Yes. The Goodman dual-fuel design accepts both natural gas and propane without orifice changes. Verify your local utility supply and have a licensed installer configure the regulator accordingly. This flexibility helps future-proof your system if energy sources change.

What's the actual tonnage for cooling, and does it match the heating capacity? +

The system is rated 4 tons for cooling capacity, producing 45,500 BTU. However, the furnace is 80,000 BTU heating, which slightly exceeds typical 4-ton matching. This minor mismatch is acceptable and actually common in replacements where existing ductwork determines final tonnage selection.

How does 15 SEER cooling efficiency compare to newer systems? +

15 SEER meets federal minimums but trails newer systems at 16-18 SEER. The scroll compressor and single-stage condenser design explain this. You'll see measurable cooling savings versus pre-2015 equipment, but newer high-efficiency models may save an additional 10-15% on summer cooling costs.

Is 80% AFUE furnace efficiency worth upgrading from an older unit? +

Upgrading from 60-70% AFUE equipment to 80% improves heating efficiency by 13-33%, translating to lower winter gas bills. However, high-efficiency 95%+ condensing furnaces offer 15% additional savings. The trade-off here is upfront cost versus operating cost over 15-20 years.

What does the 10-year warranty actually cover if something fails? +

Factory defects in parts are covered for 10 years with registration. Normal wear, installation errors, and refrigerant recharging are not included. Extended coil coverage provides extra protection. Review the full terms before purchasing if you want clarity on specific component coverage.

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