3 Ton 14 SEER 97% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This Goodman system makes sense for budget-conscious homeowners in moderate climates who want solid efficiency without paying premium brand markup. At $647, you're getting respectable specs that punch above typical entry-level pricing, though the single-stage compressor means less precise cooling control than higher-tier units.

Review

The Goodman 3-ton system represents a strategic entry point in the mid-efficiency furnace market. Online Supply prices this unit aggressively at $647, undercutting comparable Lennox and Carrier combos by 30-40 percent. The downflow configuration suits basements and attics, while Goodman's market position trades brand prestige for solid engineering. This isn't stripped-down budget equipment, but rather competent climate control that prioritizes practical performance over luxury features.

Heating output reaches 100,000 BTU with a 97% AFUE rating, which translates to approximately $0.97 of heat generated per dollar of natural gas spent. The cooling side delivers 34,800 BTU (not 41,400 BTU typical of true 3.5-ton capacity), backed by a 16 SEER rating that exceeds most competitor offerings at this price. The modulating burner stages provide intermediate firing rates for smoother temperature transitions. Variable-speed ECM blower capped at 2,000 CFM handles distribution efficiently without constant full-speed operation.

Pros & Cons

Pros

97% AFUE heating efficiency keeps gas bills low, translating to roughly $200-400 annual savings versus 80% units
16 SEER cooling rating exceeds the 14 SEER headline spec, offering genuine Energy Star qualification
Modulating burner stages deliver more even heating comfort and faster warm-up compared to on-off burners
Variable-speed ECM blower motor runs quietly and adjusts to actual heating/cooling demand, improving efficiency
10-year warranty with online registration covers manufacturing defects on both furnace and evaporator coil

Cons

Single-stage compressor can't modulate cooling capacity, meaning less precise temperature control in mild weather
73.5 dB noise level is noticeably audible during operation, particularly in open floor plans
3.5-ton cooling capacity listed but product title claims 3 ton, creating spec confusion that needs clarification

Who Should Buy

Best For

Homeowners replacing aging furnace-AC combos in climates with moderate cooling loads who prioritize heating efficiency and don't mind slightly noisier operation. This works well for 1,500-2,200 square foot homes in mixed climates where gas heating dominates utility costs.

Consider Alternatives If

Anyone in hot climates needing quiet, precise cooling should look at variable-capacity units, and buyers wanting premium reliability should consider Carrier or Trane despite higher pricing.

3 Ton 14 SEER 97% AFUE 100,000 BTU Goodman Gas Fur

$647

Buy at HVACDirect →

Installation

This downflow unit requires vertical ductwork, making it suitable for basement or attic installation. Electrical demands are straightforward: 115V single-phase 60 Hz service with 18.7 to 30-amp breaker sizing. PVC exhaust flue is required, simplifying venting compared to Category III furnaces. Refrigerant lines use standard 3/8-inch and 7/8-inch connections with 50 feet of pre-insulated suction line included. Installation typically requires certified HVAC contractor due to refrigerant handling regulations.

Warranty & Reliability

Goodman provides 10 years of parts coverage when you register online within 30 days of installation. The warranty covers the furnace heat exchanger, compressor, and the included evaporator coil against manufacturing defects. Labor costs fall on the homeowner. This mid-tier warranty is respectable but shorter than some competitors offering 12 years at similar price points.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
Weight (in lbs)	30.000000
Feature	Spec
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	30 amps
Min. Breaker Size	18.7 amps
Tonnage	3.5 Ton
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.
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.
AHRI Certificate Number	7424272
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	97%
Blower Motor	Variable Speed - ECM
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Modulating
Fuel Type	Propane, Natural Gas
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Does the spec sheet say 3 ton or 3.5 ton, and which is accurate? +

The product title claims 3 ton, but specifications list 3.5 ton tonnage with 34,800 cooling BTU. The discrepancy suggests oversized equipment for lighter cooling loads. Verify actual capacity against your home's Manual J load calculation with your installer before committing.

What breaker size do I need for electrical service? +

Minimum breaker is 18.7 amps, maximum is 30 amps. Most installations use 20-amp or 25-amp breakers depending on circuit distance and your electrician's assessment. Verify existing panel capacity before purchasing.

How much will this system save me compared to an 80% AFUE furnace? +

The 97% AFUE versus typical 80% unit saves approximately 17 percent on heating costs. For an average home spending $1,200 annually on gas heat, expect roughly $200 annual savings. Your actual savings depend on local gas rates and thermostat settings.

Is this comparable to Carrier or Lennox at this price? +

Goodman units typically score lower on noise and compressor smoothness but match efficiency ratings. At $647 versus $1,000-plus for equivalent Carrier models, you're trading brand cachet for value. Performance across heating is nearly identical.

Will I need to register the warranty immediately after installation? +

Yes, you must register within 30 days of installation to activate the 10-year coverage. Without registration, warranty defaults to one year. Keep installation documentation and receipt.

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