3 Ton 13 SEER 96% AFUE 80,000 BTU Goodman Gas Furnace and Air Conditioner System - Downflow Review 2026

// Bottom Line

This ACiQ system delivers genuine heating and cooling efficiency for contractors who need a compact, downflow solution in tight attic or basement spaces. The 96% AFUE furnace with variable-speed blower and PVC exhaust compatibility make it ideal for tight installations where traditional metal venting won't work.

Review

The ACiQ 3-ton system (technically 3.5-ton capacity) combines Goodman's proven furnace platform with integrated air conditioning in a compact 30x21x21-inch footprint. This unit targets the contractor sweet spot, balancing efficiency against real-world installation constraints. The downflow configuration solves a genuine problem for technicians working in attics and tight basements where traditional upflow units cannot fit or require expensive ductwork modifications.

Heating performance reaches 96% AFUE with an 80,000 BTU capacity and two-stage burner, delivering measurable winter efficiency gains. The variable-speed ECM blower adjusts output between 0-1,600 CFM, cutting runtime waste during partial-load operation. Cooling hits 13 SEER with 36,000 BTU capacity using R454B refrigerant, a low-GWP option compliant with EPA transition timelines. The single-stage compressor and reciprocating design are field-proven, though cooling efficiency trails 14-16 SEER competitors.

Pros & Cons

Pros

96% AFUE heating efficiency significantly reduces winter energy costs compared to 80-90% units
Variable-speed ECM blower adjusts to actual heating and cooling demand, lowering electricity use
PVC/plastic exhaust flue requirement enables cost-effective installation in confined spaces
Two-stage burner provides steady, modulated heating rather than on-off cycling
Downflow/horizontal orientation fits attic and tight basement locations where upflow units won't fit
13 SEER cooling with R454B low-GWP refrigerant meets forward-looking environmental standards
10-year warranty with online registration provides solid long-term coverage

Cons

Not Energy Star certified despite high efficiency ratings, limiting rebate eligibility in some programs
13 SEER cooling lags behind higher-tier competitors at 14-16 SEER, though acceptable for this price point
Single-stage condenser means cooling doesn't modulate like heating does, less efficient in mild weather
74 dB decibel level is audible, particularly noticeable in quiet residential settings

Who Should Buy

Best For

Contractors installing replacement systems in homes with limited space, particularly those with attic furnaces or basements with low clearance. Homeowners in moderate climates prioritizing heating efficiency and willing to accept mid-range cooling performance will see solid year-round savings.

Consider Alternatives If

Anyone seeking maximum cooling efficiency or Energy Star certification, or those in very hot climates where single-stage cooling dominates seasonal runtime and energy bills.

3 Ton 13 SEER 96% AFUE 80,000 BTU Goodman Gas Furn

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Installation

This downflow unit requires PVC or plastic exhaust venting, which simplifies installation in tight spaces where metal flue routing creates headaches. The 208/230V single-phase 60 Hz electrical requirement needs a 19.1-30 amp breaker, standard in most homes. Valve connections use 3/8-inch and 3/4-inch sweat fittings with 30-foot suction line insulation, demanding competent brazing work. Installation manuals are provided in PDF format.

Warranty & Reliability

Goodman backs this system with a 10-year parts warranty upon online registration, covering compressor, coil, and furnace components. This matches industry mid-tier coverage and provides reasonable protection against manufacturing defects. Registration is straightforward but required to activate full coverage, so documentation is essential at handoff to homeowners.

Specifications

SKU	ACiQ-36-EHPD-UPG
Brand/Manufacturer	ACiQ
Cooling BTU	36,000
Heating BTU	80,000
Refrigerant	R454B
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	74
Weight (in lbs)	120.000000
Feature	Spec
AHRI Certificate Number	7368843
Airflow Direction	Downflow/Horizontal
Exhaust Flue Requirement	Plastic / PVC
Product Features	Rebate Available
Furnace Efficiency / AFUE	96%
Blower Motor	Variable Speed - ECM
Maximum CFM	1600
Configuration	Upflow / Downflow
Energy Star	No
Burner Stages	Two
Fuel Type	Propane, Natural Gas
Height	30"
Width	21"
Depth	21"
Resources	CAPT Installation Manual CAPT 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	GSX130362, GSX130363, GSX130365
SEER1 (Efficiency)	13
Condenser Stages	Single Stage
Compressor Type	Reciprocating
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	30 amps
Min. Breaker Size	19.1 amps
Tonnage	3.5 Ton
Valve Type	Sweat
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

Why is this unit listed as both 3-ton and 3.5-ton? +

The furnace delivers 80,000 BTU (approximately 3-ton equivalent), while the condenser is rated 36,000 BTU (3-ton cooling). The product spec shows 3.5-ton tonnage, reflecting AHRI certification pairing. For practical purposes, treat this as a true 3-ton system where furnace slightly oversizes the air conditioning side.

Can I use this in an upflow configuration instead of downflow? +

Technically yes, the spec lists upflow/downflow configuration capability. However, this unit is specifically designed and tested downflow. If you need upflow, choose a dedicated upflow model to ensure proper airflow, combustion, and performance according to AHRI certification 7368843.

How much will the 96% AFUE save compared to an 80% furnace? +

At 80% AFUE, 20% of fuel energy escapes unused. At 96% AFUE, only 4% is wasted. On a typical $1,200 annual heating bill, expect 15-20% savings, roughly $180-240 yearly. Over 15 years, that compounds to $2,700-3,600 in fuel savings, often exceeding the efficiency upgrade cost.

How does 13 SEER compare to higher-efficiency units, and is it worth upgrading? +

13 SEER meets current minimum efficiency standards but trails 14-16 SEER units by 8-23% in cooling efficiency. In mild climates, the difference may justify higher cost. In hot regions where AC runs 6+ months annually, upgrading to 16 SEER often pays back within 5-7 years through reduced electricity consumption.

What does the 10-year warranty actually cover? +

Goodman covers compressor, condenser coil, furnace heat exchanger, and other major components for 10 years with registration. Labor and refrigerant are typically excluded. Review the specific warranty document provided at installation to confirm coverage limits and any exclusions applicable to your model.

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