3 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This system works well for budget-conscious homeowners replacing older equipment in moderate climates where 80% AFUE meets code requirements. At $647, it delivers solid performance without premium pricing, though it's not the most efficient option available.

Review

Goodman's 3-ton gas furnace and air conditioner combination stands out as an affordably priced entry-level system for homeowners facing urgent replacement decisions. This upflow configuration from Online Supply positions itself as a practical solution in the competitive residential HVAC market. At $647, the system undercuts many competitors while maintaining Energy Star certification, making it relevant for cost-sensitive buyers who aren't chasing peak efficiency ratings.

The system delivers 100,000 BTU heating capacity with 80% AFUE efficiency and 34,800 BTU cooling output rated at 16 SEER2. The variable-speed blower motor adjusts to 2,000 CFM maximum, while two burner stages allow the furnace to modulate heat output. Electrical requirements sit at 208/230V single-phase, with 18.7 to 30 amp breaker sizing. The scroll compressor uses R410A or R22 refrigerant in a single-stage cooling configuration.

Pros & Cons

Pros

Excellent price point at $647 for a matched furnace and AC system
Energy Star certified with variable-speed blower motor for better comfort control
Two-stage burner provides heating flexibility and modulation for 100,000 BTU output
3.5-ton cooling capacity with 16 SEER2 efficiency on the condenser side
10-year warranty with online registration covers both heating and cooling components
Upflow/horizontal configuration suits common residential installations with flexible ductwork

Cons

80% AFUE is dated by modern standards, missing high-efficiency rebates in many states
73.5 dB noise level is moderately loud during operation, noticeable in quiet homes
Single-stage condenser limits cooling modulation despite variable furnace blower

Who Should Buy

Best For

Homeowners replacing failed systems in mild to moderate climates who need quick replacement without major investment. This system also suits rental properties or homes where occupancy is seasonal and premium efficiency doesn't justify the higher cost.

Consider Alternatives If

Anyone in cold climates seeking long-term energy savings should investigate 95% AFUE systems instead, as heating represents their largest operating cost.

3 Ton 15 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

$647

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Installation

Installation requires metal exhaust flue piping and standard upflow positioning in basements or closets. The unit measures 30 inches high by 21 inches wide and deep, fitting typical furnace spaces. A-coil evaporator design works with most existing ductwork systems. Installation documentation includes the CAPF manual and specifications sheet, though professional installation is strongly recommended for proper gas line connections and refrigerant charging.

Warranty & Reliability

The 10-year warranty requires online registration to activate full coverage on both furnace and evaporator coil. This extended protection on major components provides reasonable peace of mind for budget buyers. Coverage specifics should be confirmed directly with Online Supply before purchase to understand claim processes and any exclusions.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	34,800
Heating BTU	100,000
Refrigerant	R410A or R22
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73.5
Weight (in lbs)	30.000000
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	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	30 amps
Min. Breaker Size	18.7 amps
Tonnage	3.5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

How does 80% AFUE compare to newer high-efficiency furnaces? +

80% AFUE means 20% of gas energy vents away as waste, typical for standard equipment. High-efficiency 95% AFUE systems capture more heat, cutting heating costs 15-20% annually. This older rating suits moderate climates where heating season is shorter, making payback periods longer for efficiency upgrades.

Can this system work with my existing ductwork? +

The upflow A-coil configuration accommodates most residential duct systems, though ductwork sizing should handle the 2,000 CFM maximum airflow. Have a technician verify your existing ducts are properly sealed and insulated. Mismatched ductwork reduces efficiency regardless of equipment quality, so inspection before installation matters.

Does the variable-speed blower actually save energy? +

Yes, variable-speed motors run at lower speeds during partial-load heating and cooling, reducing electrical consumption compared to single-speed units. Combined with 80% AFUE furnace efficiency and the blower's modulation, you'll see measurable savings on utility bills compared to older single-stage systems.

Is this system quieter than older furnaces? +

At 73.5 dB, it operates at moderate noise levels, comparable to standard equipment. This is audible in quiet rooms but quieter than very old systems. If noise is a major concern, variable-speed blowers at lower speeds are quieter, but peak heating output remains similar to standard units.

What does the 10-year warranty actually cover? +

Full coverage on furnace heat exchanger, compressor, and evaporator coil requires online registration. Check with Online Supply on labor coverage and whether parts are fully covered. Most manufacturers limit evaporator coil warranties separately, so confirm specific claim procedures before installation.

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