1.5 Ton 14 SEER Goodman Air Conditioner with Horizontal 17.5" Cased Coil Review 2026

// Bottom Line

This ACiQ 1.5-ton coil is ideal for contractors retrofitting older systems or homeowners upgrading compact spaces where a standard upright won't fit. The 14 SEER rating delivers respectable efficiency at an accessible price point, and the horizontal A-coil design makes it perfect for attic or basement installations.

Review

The ACiQ 1.5-ton horizontal A-coil is a straightforward, no-nonsense cooling solution positioned for contractors and homeowners dealing with space limitations. With an 18,000 BTU cooling capacity and 14 SEER rating, it delivers mid-tier efficiency at a competitive price point. The horizontal cased coil design makes this particularly valuable for attic installations, basement locations, and tight mechanical rooms where traditional vertical coils won't fit. It's built on proven Goodman platform engineering and targets the practical contractor market rather than premium segments.

Performance metrics show 18,000 BTU cooling capacity with 14 SEER efficiency, delivering approximately 1.3 watts per BTU of cooling. The rotary compressor operates as a single-stage unit at 208/230V single-phase, drawing between 12-30 amps depending on your electrical service. Operating sound output measures 71 dB, which is noticeable but acceptable for basement or attic placement. The R454B refrigerant aligns with EPA transition requirements, and pre-charged refrigerant lines come with 50 feet of insulated suction line, simplifying field connections.

Pros & Cons

Pros

14 SEER efficiency rating meets mid-range performance expectations for budget-conscious buyers
Compact 26x26x27.5 inch footprint fits tight spaces where standard coils won't work
R454B refrigerant compatibility positions this for future-ready installations
10-year warranty with online registration provides solid long-term protection
Single-stage rotary compressor is proven technology with good serviceability

Cons

14 SEER is outdated as of 2023 SEER2 standards, limiting marketing appeal
71 dB noise level is higher than premium competitors, noticeable during operation
Not Energy Star certified, missing qualification for some rebate programs
Single-stage compressor means less part-load efficiency in mild weather
No variable capacity staging for modulating output

Who Should Buy

Best For

Contractors performing system replacements in homes with space constraints, particularly in attic or crawlspace locations where horizontal orientation is necessary. Budget-conscious homeowners seeking reliable 1.5-ton cooling without premium pricing.

Consider Alternatives If

Buyers prioritizing quiet operation, maximum efficiency rebates, or who need variable-stage compressor technology for energy optimization in mixed climates.

1.5 Ton 14 SEER Goodman Air Conditioner with Horiz

Buy at HVACDirect →

Installation

This horizontal coil integrates directly with existing ductwork or furnace returns without complicated modifications. The 26-inch dimensions fit standard joist spacing in many attics. You'll need a 12-30 amp breaker sized appropriately for your voltage supply. Refrigerant connections use standard 3/8-inch liquid and 3/4-inch suction lines, both included. Installation complexity is low to moderate for experienced HVAC technicians familiar with coil placement and airflow requirements.

Warranty & Reliability

The 10-year warranty requires online registration to activate full coverage. This is a substantial protection period for the coil core and components, standard among Goodman-branded equipment. Labor and refrigerant charges typically fall outside coverage. Registration is straightforward and can be completed immediately after installation, ensuring you don't accidentally forfeit protection.

Specifications

SKU	ACIQ-18-EHPD-UPG
Brand/Manufacturer	ACiQ
Cooling BTU	18,000
Refrigerant	R454B
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	71
Weight (in lbs)	120.000000
Feature	Spec
Configuration	Horizontal
Liquid Line	3/8"
Suction Line	3/4"
Tonnage	1.5 Ton
Style	A-Coil
Height	27.5"
Width	26"
Depth	26"
Resources	Goodman Installation Manual Goodman Specifications Goodman Brochure Goodman Warranty Information Goodman Service Instructions Goodman Kit Instructions Goodman Parts Manual 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	No
SEER1 (Efficiency)	14
Condenser Stages	Single Stage
Compressor Type	Rotary
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	30 amps
Min. Breaker Size	12 amps
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

What exactly is 14 SEER and how does it compare to current standards? +

SEER measures seasonal cooling efficiency, with 14 SEER indicating approximately 1.3 watts of electrical input per BTU of cooling output. Modern SEER2 ratings (effective 2023) are roughly 15-20% lower numerically, so this unit would rate around 11 SEER2. It's mid-tier efficiency, solid for cost-conscious buyers but not premium.

Will this coil work in my attic if I have limited vertical clearance? +

Yes. The horizontal orientation and 27.5-inch height make it ideal for attic installations where headroom is tight. The 26x26-inch footprint fits standard attic joists. Ensure adequate return duct clearance and proper condensate drainage sloped away from the equipment for reliable operation.

Does R454B refrigerant cost more than R410A? +

R454B pricing is comparable to R410A currently, but expect future cost increases as R410A is phased out. Using R454B now future-proofs your system against refrigerant availability issues and EPA compliance pressure. It's a smart long-term choice despite no immediate cost benefit.

How does this compare to a Carrier or Lennox 1.5-ton coil? +

Carrier and Lennox charge premium pricing for equivalent capacity. This ACiQ unit delivers the same 18,000 BTU cooling at 14 SEER for less money. You sacrifice brand prestige and sometimes marginally quieter operation at higher models, but core performance is competitive.

What does the 10-year warranty actually cover? +

The warranty covers manufacturing defects in the coil, compressor, and components. It doesn't cover labor, refrigerant, or damage from improper installation. Online registration is mandatory. Check Goodman's documentation for specific exclusions applicable to your region.

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