3.5 Ton 15 SEER Goodman Air Conditioner with Horizontal 24.5" Cased Coil Review 2026

// Bottom Line

This horizontal cased coil works well for contractors retrofitting existing systems with a 3.5-ton Goodman condenser. The 16 SEER rating and Energy Star certification deliver solid efficiency gains at a competitive price point for homeowners upgrading older equipment.

Review

The Goodman 3.5-ton horizontal cased A-coil brings solid efficiency and proven durability to the mid-range residential replacement market. At 16 SEER, this coil actually exceeds the baseline 15 SEER specification, positioning it competitively against other mainstream offerings. The pre-insulated suction line and standard Goodman compatibility make this a practical choice for contractors managing high-volume retrofit work.

Performance specs show 42,000 BTU cooling output properly calibrated for 3.5-ton capacity, using environmentally sound R410A refrigerant with standard 3/8 inch liquid and 7/8 inch suction lines. The scroll compressor operates at 73 dBA, a moderate noise level typical for this tonnage class. Energy Star certification validates the efficiency claims and opens rebate eligibility for cost-conscious homeowners in most utility territories.

Pros & Cons

Pros

16 SEER efficiency exceeds the baseline 15 SEER spec, delivering measurable energy savings
Energy Star certified, qualifying many homeowners for utility rebates and tax credits
42,000 BTU cooling capacity properly matched to 3.5-ton condenser sizing
Scroll compressor design proven for reliability in residential applications
10-year warranty with online registration provides reasonable protection
Pre-insulated suction line with 3/4 inch thickness reduces field work

Cons

73 dBA operating noise runs slightly louder than some competing 3.5-ton coils
Single-stage compressor limits part-load efficiency during mild weather conditions
Horizontal-only configuration restricts installation flexibility for some homes
No variable capacity option for enhanced comfort control

Who Should Buy

Best For

Contractors performing air conditioning system replacements where a matching 3.5-ton Goodman condenser is already specified. Homeowners seeking a dependable, efficient coil upgrade that qualifies for rebates without premium pricing.

Consider Alternatives If

Buyers needing vertical or downflow coil configurations should look for A-coil alternatives. Those prioritizing ultra-quiet operation or variable-capacity performance may find better options elsewhere.

3.5 Ton 15 SEER Goodman Air Conditioner with Horiz

Buy at HVACDirect →

Installation

The horizontal 24.5 inch cased design fits standard attic and basement installations above furnaces. Dimensions of 36.25 inch height by 35.5 inch width require typical clearance space. Pre-insulated 3/4 inch suction line with 50-foot length reduces jobsite insulation labor. Electrical requirements of 208/230V single-phase demand a 23.5 to 40 amp circuit sizing.

Warranty & Reliability

Goodman's 10-year parts and labor warranty activates through online registration within 30 days of purchase. This duration is industry standard for residential coils and protects against manufacturing defects. Registration simplifies the claims process but is essential, so contractors should communicate this requirement to homeowners upfront.

Specifications

SKU	LS38783850
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Refrigerant	R410A
Electrical	208 / 230 V. 1 Phase 60 Hz
Warranty	10 Years with Online Registration
Decibel Level (dBA)	73
Weight (in lbs)	30.000000
Feature	Spec
Configuration	Horizontal
Liquid Line	3/8"
Suction Line	7/8"
Tonnage	3.5 Ton
Style	A-Coil
Height	36.25"
Width	35.5"
Depth	35.5"
Resources	Goodman Brochure Goodman Specifications Goodman Installation Manual Goodman Warranty Information Goodman Service Instructions Goodman Kit Instructions Goodman Parts Manual 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.
Energy Star	Yes
SEER1 (Efficiency)	16
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	23.5 amps
Suction Line Insulation Thickness	3/4"
Length	50 feet

Frequently Asked Questions

Will this coil work with my existing 3.5-ton Goodman condenser? +

Yes. The 42,000 BTU output and R410A refrigerant match standard 3.5-ton condenser specifications. Verify your condenser tonnage before ordering. Liquid and suction line sizes of 3/8 inch and 7/8 inch are industry standard for this capacity class.

Can this horizontal coil be installed vertically or in a downflow configuration? +

No. This unit is horizontal A-coil only. Upflow and downflow installations require different casing designs. Confirm your ductwork layout before purchase, as reconfiguration isn't possible without purchasing a different model.

What electrical breaker size do I need? +

Minimum 23.5 amps, maximum 40 amps at 208/230V single-phase 60 Hz. Most installations use a 30-amp dedicated circuit. Have a licensed electrician size the circuit based on actual compressor draw and local code requirements.

How does 16 SEER compare to competitors in this price range? +

16 SEER meets or beats most mainstream 3.5-ton coils at comparable pricing. Variable-capacity models run higher SEER ratings but cost significantly more. For straightforward replacement work, this represents good efficiency-to-cost balance.

Do I really need to register for the warranty? +

Yes. Online registration within 30 days is required to activate the 10-year warranty. Without it, coverage may be limited. Goodman's online process takes five minutes and protects your investment.

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