3.5 Ton 13 SEER 97% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This unit is best for homeowners replacing older furnaces who want measurable energy savings without premium pricing. The 97% AFUE heating efficiency and modulating burner deliver substantial heating cost reductions, while the 13 SEER cooling handles moderate climates adequately.

Review

The ACiQ-branded Goodman gas furnace and air conditioner system delivers mainstream efficiency at a practical price point. This 3.5-ton downflow configuration combines an 80,000 BTU furnace with a 42,000 BTU cooling coil, serving homes where basement or attic space is limited. The unit carries Energy Star certification and qualifies for rebates in many utility territories. At this price tier, buyers typically choose this model when replacing decade-old equipment or upgrading from single-stage systems.

The 97% AFUE furnace rating is genuinely impressive and translates to measurable monthly savings. The modulating burner stages heat output between 20% and 100% capacity, preventing the energy waste of constant on-off cycling. The variable-speed ECM blower motor adjusts cfm output from 400 to 1600 cfm based on demand. Cooling arrives at 13 SEER1 efficiency through a single-stage reciprocating compressor, adequate for mixed climates but modest compared to 14-16 SEER premium models.

Pros & Cons

Pros

97% AFUE furnace efficiency cuts heating costs significantly compared to 80-90% older units
Modulating burner stages output based on demand, reducing short-cycling and improving comfort
Variable-speed ECM blower motor delivers better temperature consistency than fixed-speed alternatives
Compact downflow A-coil design fits tight spaces where traditional models won't work
Energy Star certified with rebates available in many utility territories
10-year warranty with online registration covers parts and labor defects

Cons

13 SEER rating is solid but not premium, limiting summer efficiency in very hot climates
75 dB noise level is audible during operation, notable in quiet homes
Single-stage reciprocating compressor lacks the efficiency gains of two-stage or scroll designs
Plastic PVC flue requirement limits installation flexibility in some older homes

Who Should Buy

Best For

Contractors and homeowners replacing 15+ year old furnaces in mixed climates who prioritize heating efficiency and value. Budget-conscious buyers in moderate cooling zones who want measurable energy savings and reliability without spending on high-end SEER ratings.

Consider Alternatives If

Anyone in hot southern climates needing superior cooling performance should look at 14+ SEER units, and those in homes with older metal flue systems will face conversion costs.

3.5 Ton 13 SEER 97% AFUE 80,000 BTU Goodman Gas Fu

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Installation

Installation requires standard split-system procedures with attention to downflow clearance. The 120-pound unit measures 34.5 inches tall, 21 inches wide, and 28.75 inches deep, fitting most utility closets or basement corners. Sweat-type valve connections use 3/8-inch liquid and 7/8-inch suction lines with 3/8-inch insulation thickness. Electrical hookup needs 115V single-phase 60Hz power with 23.9 to 40-amp breaker sizing. PVC flue compatibility simplifies modern home installations but requires adapters in legacy metal ductwork.

Warranty & Reliability

Ten-year parts and labor coverage begins upon online registration, a reasonable protection level for this equipment class. Goodman's reputation for warranty support is solid, though activation requires completing registration within 30 days of installation. Coverage addresses defects in materials and workmanship but excludes normal maintenance and user-caused damage. This warranty length ranks average for mid-tier furnace equipment.

Specifications

SKU	ACIQ-4X-EHPD-UPG
Brand/Manufacturer	ACiQ
Cooling BTU	42,000
Heating BTU	80,000
Refrigerant	R410A
Electrical	115 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	75
Weight (in lbs)	120.000000
Feature	Spec
Energy Star	Yes
SEER1 (Efficiency)	13
Condenser Stages	Single Stage
Compressor Type	Reciprocating
Liquid Line	3/8"
Suction Line	7/8"
Liquid Valve Size	3/8"
Max Breaker Size	40 amps
Min. Breaker Size	23.9 amps
Tonnage	5 Ton
Valve Type	Sweat
Height	34.5"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual Goodman Specifications Goodman Technical Information Goodman User Information Goodman Warranty You will need AdobeÂ® AcrobatÂ® 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.
Configuration	Downflow/Horizontal
Style	A-Coil
AHRI Certificate Number	7424271
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	97%
Blower Motor	Variable Speed - ECM
Maximum CFM	1600
Flue Location	Right
Burner Stages	Modulating
Fuel Type	Propane, Natural Gas
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

How much will this unit reduce my heating costs compared to my old furnace? +

If replacing an 80% AFUE unit, expect 17% lower heating bills. The 97% AFUE rating means only 3 cents per dollar escapes unused, versus 20 cents on older equipment. Actual savings vary by climate and usage, but homeowners typically recover equipment costs in 4-6 years through fuel savings alone.

Does this downflow design work in my basement, or do I need horizontal installation? +

The unit handles both downflow and horizontal orientation. In basements, position it downflow with adequate space below for return air circulation. Horizontal installation in attics requires checking weight bearing capacity. The 120-pound unit distributes evenly across standard joists when properly supported.

Is 13 SEER cooling sufficient for Dallas or Phoenix? +

13 SEER provides adequate cooling in mixed climates but falls short in consistently hot zones. Dallas homeowners will see acceptable performance, though higher SEER units reduce summer utility costs. Phoenix buyers should seriously consider 14+ SEER models given extreme cooling loads and higher operational hours.

How does this modulating furnace compare to fixed-capacity models? +

Modulating burners maintain closer target temperatures by varying output rather than toggling full on-off. This reduces temperature swings, improves comfort, and lowers short-cycling losses. The efficiency advantage compounds over heating seasons, making modulating systems the practical choice for most replacements.

What happens if I don't register within 30 days? +

Warranty coverage becomes invalid without registration. Goodman requires proof of installation and equipment activation. Contractors typically handle registration at commissioning, but verify completion in writing to avoid coverage disputes later.

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