1.5 Ton 15 SEER Goodman Air Conditioner with Vertical 21" Cased Coil Review 2026

// Bottom Line

This unit works best for contractors replacing older Goodman systems where a vertical A-coil fits the existing footprint. The 16 SEER1 rating and Energy Star certification make it solid for efficiency-conscious homeowners in moderate climates, though the spec sheet contains conflicting tonnage data that requires clarification before purchase.

Review

This Goodman vertical cased coil represents a pragmatic choice for HVAC contractors handling retrofit installations where space constraints demand an A-coil configuration. The unit carries Energy Star certification and achieves 16 SEER1 efficiency, positioning it as a mid-tier replacement for aging systems. However, the product listing contains a critical data inconsistency that warrants attention before specification.

Performance metrics show 18,000 BTU cooling capacity paired with a scroll compressor and single-stage operation. The 16 SEER1 rating delivers approximately 20 percent better efficiency than standard 13 SEER equipment, meaningful for contractors tracking utility cost reductions. Operating noise registers at 71.5 dB, which is audible during peak summer cooling and slightly higher than dual-stage competitors in this efficiency tier.

Pros & Cons

Pros

16 SEER1 efficiency rating beats baseline 13-14 SEER equipment by 20-25 percent
18,000 BTU cooling capacity handles 1.5-ton loads efficiently
Scroll compressor is proven reliable technology favored by contractors
10-year warranty with online registration provides solid coverage
Vertical 21-inch cased A-coil design fits tight retrofit applications
Energy Star certified for utility rebates and tax incentives

Cons

Spec sheet lists conflicting tonnage: header says 1.5 ton but specs show 3.5 ton, creating confusion
Single-stage compressor cannot modulate capacity for variable cooling needs
71.5 dB noise level is higher than dual-stage competitors, noticeable during operation
Requires 208/230V single-phase power, limiting installation flexibility

Who Should Buy

Best For

Contractors handling Goodman GSX16S181 replacements where vertical coil space is constrained will find this a direct fit. Homeowners in moderate climates seeking reliable efficiency upgrades at reasonable cost benefit from the 16 SEER1 rating and Energy Star status.

Consider Alternatives If

Skip this if your installation requires variable-capacity cooling, noise levels below 68 dB, or you need equipment that meets 17+ SEER2 standards for high-efficiency rebate programs.

1.5 Ton 15 SEER Goodman Air Conditioner with Verti

Buy at HVACDirect →

Installation

Retrofit installation favors this coil's vertical 21-inch width and 30-inch height, fitting tight closets and basement locations where horizontal units fail. Requires standard 3/8-inch liquid and 3/4-inch suction lines with 3/4-inch insulation thickness. Electrical demand needs 208/230V single-phase 60 Hz service with 12.4 to 20-amp breaker sizing, typical for residential applications.

Warranty & Reliability

Goodman backs this unit with a 10-year parts warranty, activated through online registration. Coverage includes compressor and coil defects but typically excludes labor. This warranty ranks mid-range compared to extended 10-12 year competitor programs; registration is mandatory to activate coverage.

Specifications

SKU	LS38343850
Brand/Manufacturer	Online Supply
Cooling BTU	18,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	71.5
Weight (in lbs)	22.000000
Feature	Spec
Replaces	GSX16S181
Energy Star	Yes
SEER1 (Efficiency)	16
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	3/4"
Max Breaker Size	20 amps
Min. Breaker Size	12.4 amps
Tonnage	3.5 Ton
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.
Configuration	Upflow / Downflow
Liquid Line	3/8"
Suction Line	3/4"
Style	A-Coil
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Why does the listing show both 1.5 ton and 3.5 ton specifications? +

The header claims 1.5 ton while the specs section lists 3.5 ton tonnage. This discrepancy requires vendor clarification before purchase. The 18,000 BTU capacity aligns with 1.5-ton classification. Contact supplier to confirm actual unit specifications and replacement compatibility with your GSX16S181.

Can this coil retrofit into my existing Goodman outdoor unit? +

Direct fit is likely if replacing a GSX16S181, as stated in the product description. Verify outdoor condenser tonnage matches and liquid/suction line sizes match: 3/8-inch liquid and 3/4-inch suction. Always confirm refrigerant type (R410A here) matches your outdoor unit before installation.

How much will this unit reduce my cooling costs compared to my old AC? +

The 16 SEER1 rating versus typical 13 SEER older units represents roughly 23 percent better efficiency. Actual savings depend on your local electricity rates and cooling hours. A 2-ton unit operating 8 hours daily might save 300-400 dollars annually in moderate climates.

Is 16 SEER1 competitive with modern high-efficiency options? +

16 SEER1 sits in the mid-efficiency range. Current top-tier options reach 17-20 SEER2, offering better long-term savings but higher upfront cost. This unit balances affordability with meaningful efficiency gains for most residential retrofits.

Does the 10-year warranty cover refrigerant leaks or compressor failure? +

Yes, compressor and coil defects including refrigerant leaks fall under coverage. However, parts-only warranty requires you to pay labor costs for technician visits. Registration is mandatory within 30 days of installation.

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