4 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Heat Pump System - Downflow Review 2026

// Bottom Line

This ACiQ 4-ton system is ideal for mixed-climate homeowners who need reliable heating and cooling without premium pricing. The 14 SEER rating delivers solid year-round efficiency, while the 80% AFUE gas furnace ensures dependable winter performance when temperatures drop below heat pump thresholds.

Review

The ACiQ 4-ton hybrid system bridges the gap between dedicated heat pump and traditional gas furnace markets. Marketed under Goodman's trusted ACiQ brand, this downflow unit combines a 14 SEER heat pump condenser with an 80% AFUE gas furnace, delivering year-round climate control without requiring extensive ductwork modifications. Energy Star certification and available rebates make it competitive in the mid-range residential HVAC segment.

Performance specs show a 46,000 BTU cooling capacity paired with a 100,000 BTU heating output, giving homeowners flexibility across seasons. The scroll compressor operates at 74 dBA, which is moderate for a single-stage unit. Electrical requirements are straightforward, running 120V 1-phase 60Hz with a 26.4 to 40-amp breaker range. The A-coil downflow design with 2,000 CFM maximum airflow suits homes with upper-level furnace placement, though the 80% AFUE gas efficiency means roughly 20% of heating fuel is lost to exhaust.

Pros & Cons

Pros

14 SEER1 efficiency rating meets Energy Star standards for cooling season savings
100,000 BTU gas furnace provides 80% AFUE heating, eliminating reliance on heat pump in extreme cold
5-ton condenser with scroll compressor handles peak cooling loads in larger homes
Downflow A-coil configuration suits attic or closet installations in diverse home layouts
Rebate availability reduces upfront cost burden for budget-conscious buyers

Cons

Single-stage compressor lacks variable capacity, reducing part-load efficiency during mild weather
74 dBA noise level is moderately loud, noticeable from adjacent rooms during operation
80% AFUE furnace efficiency trails modern 95%+ condensing models, wasting 20% of fuel energy

Who Should Buy

Best For

Homeowners in transitional climates who want hybrid heating flexibility and solid baseline efficiency without spending on premium inverter-drive compressors or high-efficiency furnaces. Contractors seeking reliable, rebate-eligible replacement units that work in existing downflow installations.

Consider Alternatives If

Cold-climate buyers prioritizing heating efficiency should consider 95%+ AFUE condensing furnaces; heat-pump-centric regions don't need 100,000 BTU gas backup.

4 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Fur

Buy at HVACDirect →

Installation

Installation demands standard refrigerant line sizing with 3/8-inch liquid and 7/8-inch suction connections, plus pre-insulated 1/8-inch suction line running up to 50 feet. The metal flue exits from the top, requiring venting compliance with local codes. Downflow configuration eliminates complex ductwork restructuring but does require clearance of 33.38 inches in height. Most contractors can install within one to two days.

Warranty & Reliability

ACiQ backs this system with a 10-year parts warranty contingent on online registration. This covers compressor, heat exchanger, and major components, though labor is not included. Registration is quick and typically done at startup, protecting your investment against manufacturing defects during the critical first decade of operation.

Specifications

SKU	ACIQ-48-EHPD-UPG
Brand/Manufacturer	ACiQ
Cooling BTU	46,000
Heating BTU	100,000
Refrigerant	R454B
Electrical	120 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	74
Weight (in lbs)	120.000000
Feature	Spec
Replaces	GSZ140491
Product Features	Rebate Available
Energy Star	Yes
SEER1 (Efficiency)	14
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	26.4 amps
Tonnage	5 Ton
Valve Type	Sweat
Height	33 3/8"
Width	21"
Depth	28.75"
Resources	Goodman Brochure Goodman Installation Manual 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	Dedicated Downflow
Liquid Line	3/8"
Suction Line	1 1/8"
Style	A-Coil
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi Speed - PSC
Maximum CFM	2000
Flue Location	Top
Burner Stages	Single
Fuel Type	Gas
Suction Line Insulation Thickness	1/2"
Length	50 feet

Frequently Asked Questions

What makes this different from a straight heat pump or furnace alone? +

This hybrid system runs the 14 SEER heat pump during moderate weather, then automatically switches to the 100,000 BTU gas furnace when temperatures drop below the heat pump's effective range, typically 35-40 degrees Fahrenheit. This avoids the high auxiliary heat costs of pure heat pumps in cold climates.

Can I install this in an existing downflow closet or attic space? +

Yes. The downflow A-coil configuration is specifically designed for upflow furnace replacement. Dimensions are 33.38 inches tall by 21 inches wide by 28.75 inches deep. Verify your space accommodates these measurements and allows 50 feet of refrigerant line runs to the outdoor condenser.

How does 14 SEER compare to modern heat pumps? +

14 SEER1 is solid mid-tier performance, meeting Energy Star minimums but trailing 16+ SEER inverter models. Single-stage compression means less efficiency at part load, so cooling costs remain moderate rather than exceptional. Good for mixed climates, not optimal for hot regions.

Should I choose this over a high-efficiency 95% AFUE furnace? +

Not if heating dominates your utility bills. The 80% AFUE gas furnace wastes 20% of fuel energy compared to 95%+ condensing units. Choose this if cooling needs rival heating, or if rebates and lower upfront cost outweigh long-term efficiency gains.

Is the 10-year warranty enough protection? +

Yes, assuming you register online immediately. It covers major components like the compressor and heat exchanger. Most failures occur within five years, so 10 years provides solid protection. Labor and routine maintenance are excluded.

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