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

// Bottom Line

This is an excellent replacement coil for contractors upgrading existing Goodman systems on a budget. The 16 SEER rating and Energy Star certification deliver solid efficiency gains, making it ideal for homeowners in moderate climates who want measurable savings without premium pricing.

Review

The Goodman 1.5 Ton 15 SEER horizontal cased coil occupies a practical middle ground in the residential cooling market. Priced at $115, it targets contractors and homeowners seeking efficient replacement components without premium costs. The unit carries Energy Star certification and replaces the common GSX16S181 model, making it a straightforward upgrade path for existing installations. Online Supply markets this as a reliable option for moderate climate zones where aggressive efficiency gains justify the investment.

Performance metrics tell a solid story. The unit delivers 18,000 BTU cooling capacity paired with a 16 SEER1 efficiency rating, representing genuine improvements over baseline equipment. The scroll compressor operates at 71.5 dB, staying within acceptable noise ranges for residential applications. Electrical requirements are modest at 208-230V single phase 60Hz with a 12.4 to 20 amp breaker range. The horizontal A-coil configuration measures 21 inches by 21.125 inches, fitting standard indoor handler spaces with minimal modification needed.

Pros & Cons

Pros

16 SEER1 efficiency rating exceeds baseline requirements and qualifies for Energy Star
18,000 BTU capacity covers typical 1.5 ton residential cooling loads effectively
Scroll compressor technology provides reliable, quiet operation at 71.5 dB
Replaces GSX16S181 model, simplifying retrofit installations for existing systems
10 year warranty with online registration provides solid long term protection

Cons

Spec sheet lists conflicting tonnage, 1.5 ton in title but 3.5 ton in specifications, creating confusion
Single stage compressor lacks variable capacity for part load efficiency
R410A or R22 refrigerant support may limit future system upgrades

Who Should Buy

Best For

HVAC contractors performing Goodman system replacements will appreciate the direct compatibility with GSX16S181 units. Budget conscious homeowners wanting genuine efficiency improvements without high end pricing find strong value here.

Consider Alternatives If

Systems requiring variable capacity staging or advanced modulation should look at higher tier products with multi stage compressors.

1.5 Ton 15 SEER Goodman Air Conditioner with Horiz

$115

Buy at HVACDirect →

Installation

Installation complexity is moderate. The unit connects via 3/8 inch liquid lines and 3/4 inch suction lines with preinstalled 3/4 inch insulation thickness. Technicians need basic HVAC skills to handle refrigerant connections and electrical wiring. The 22 pound weight allows single person handling. Horizontal mounting in attics or crawlspaces is straightforward, though proper suction line evacuation and charging remains critical for optimal SEER performance.

Warranty & Reliability

Goodman includes a 10 year parts and labor warranty when registered online. This coverage protects against compressor failures, refrigerant leaks, and coil defects during the critical ownership period. Registration is straightforward and typically completed at purchase. This warranty term aligns with industry standards for mid range equipment and provides meaningful financial protection for residential buyers.

Specifications

SKU	LS38343850
Brand/Manufacturer	Online Supply
Cooling BTU	18,000
Refrigerant	R410A or R22
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
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	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	21"
Width	21.125"
Depth	26"
Resources	CHPF Installation Manual CHPF Specifications Sheet Goodman Evaporator Coil Warranty You will need Adobe® Acrobat® Reader to view PDF documents.
Configuration	Horizontal
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 spec sheet list both 1.5 ton and 3.5 ton ratings? +

This appears to be a data entry error in the product specifications. The 18,000 BTU cooling capacity and model designation clearly indicate 1.5 ton capacity. Verify with Online Supply before purchase. The tonnage discrepancy could affect proper system matching and installation planning.

Can this coil work with my existing 10 year old Goodman condenser? +

Yes, if your condenser is a GSX16S181 or compatible model using R410A refrigerant. Cross reference your current equipment serial number with Goodman documentation. Mixing refrigerants or incompatible components creates performance loss and warranty voidance. Consult a certified technician if uncertain about compatibility.

What efficiency improvements can I expect versus an older coil? +

The 16 SEER1 rating typically delivers 20 to 30 percent better efficiency than 10 SEER equipment from the 1990s and 2000s. Actual savings vary by climate, usage patterns, and condenser pairing. Energy Star certification indicates baseline efficiency compliance. Real world electricity bill reductions depend on local rates and system runtime.

How does this compare to Carrier or Lennox equivalent coils? +

Goodman equipment consistently undercuts premium brands on price while maintaining competitive efficiency ratings. This 16 SEER coil trades advanced features like variable capacity for simplicity and lower cost. Carrier and Lennox models offer more staging options but cost significantly more, making this ideal for value conscious buyers.

What happens if I don't register the warranty online? +

Goodman may limit warranty claims to manufacturer coverage only, excluding labor costs. Registration is free and typically takes minutes. Verify registration confirmation to ensure coverage is activated before any service calls become necessary.

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