3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas Furnace and Air Conditioner System - Upflow Review 2026

// Bottom Line

This Goodman combo works best for contractors and homeowners replacing older systems in moderate climates where 14 SEER cooling and 80% AFUE heating meet budget constraints. The two-stage burner and multi-speed blower deliver respectable comfort without premium pricing.

Review

The Goodman 3.5 Ton gas furnace and air conditioner combo represents a practical middle-ground solution for contractors and homeowners managing tight installation budgets. At 14 SEER cooling efficiency and 80% AFUE heating, this system sits comfortably in the value tier, neither stripped-down nor feature-heavy. The upflow configuration and compact 30x21x21 inch frame make it suitable for basements, attics, and closets where space constraints limit options.

Real-world performance centers on the two-stage burner design and multi-speed blower motor that work together to reduce furnace cycling and improve temperature consistency. The 100,000 BTU heating output pairs with 42,000 BTU cooling capacity, making this system appropriate for mixed climates rather than heavy cooling regions. At 2,000 CFM maximum airflow and 73 dB noise level, expect moderate comfort during peak operation, with audible blower noise during heating season being typical.

Pros & Cons

Pros

Two-stage burner with multi-speed blower minimizes short-cycling and improves comfort consistency
14 SEER cooling rating delivers solid efficiency without ENERGY STAR cost premium
Compact dimensions (30x21x21 inches) fit tight installation spaces better than larger tonnage units
Flexible refrigerant compatibility with R410A or R22 supports retrofit and new build applications
10-year warranty with online registration provides baseline protection for parts and labor

Cons

80% AFUE is now outdated, with modern 95% systems offering 15-point efficiency gains and better long-term savings
Not ENERGY STAR certified, limiting appeal to eco-conscious buyers and energy rebate programs
73 dB decibel level runs slightly louder than premium residential units, noticeable during heating cycles

Who Should Buy

Best For

Contractors building rental portfolios or handling budget-focused residential replacements will appreciate the straightforward two-stage design and compact footprint. Homeowners in heating-dominated climates with moderate cooling needs and limited renovation budgets can achieve acceptable efficiency at entry-level pricing.

Consider Alternatives If

Buyers prioritizing energy efficiency and long-term operating cost reduction should skip this unit for modern 95% AFUE furnaces and 16+ SEER air conditioners, which recoup higher upfront costs within 7-10 years.

3.5 Ton 14 SEER 80% AFUE 100,000 BTU Goodman Gas F

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Installation

Installation requires standard gas line connections and a metal flue exhaust vent, both straightforward for licensed HVAC technicians. Electrical demands fall within typical residential capacity at 208/230V single-phase with 22-35 amp breaker sizing. The compact body simplifies positioning, though proper ductwork sizing to the 2,000 CFM maximum remains critical for airflow efficiency.

Warranty & Reliability

The 10-year parts warranty (activated through online registration) covers manufacturing defects and component failures, providing baseline protection for homeowners. This period aligns with industry standard for mid-tier equipment but falls short of extended warranties offered by premium brands. Labor coverage terms depend on the installing contractor's agreement.

Specifications

SKU	LS38783830
Brand/Manufacturer	Online Supply
Cooling BTU	42,000
Heating BTU	100,000
Refrigerant	R410A or R22
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
Airflow Direction	Upflow/Horizontal
Exhaust Flue Requirement	Metal
Furnace Efficiency / AFUE	80%
Blower Motor	Multi-Speed
Maximum CFM	2000
Configuration	Upflow / Downflow
Burner Stages	Two
Fuel Type	Gas
Height	30"
Width	21"
Depth	21"
Resources	CAPF Installation Manual CAPF 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.
Energy Star	No
SEER1 (Efficiency)	14
Condenser Stages	Single Stage
Compressor Type	Scroll
Liquid Valve Size	3/8"
Suction Valve Size	7/8"
Max Breaker Size	35 amps
Min. Breaker Size	22 amps
Tonnage	5 Ton
Liquid Line	3/8"
Suction Line	7/8"
Style	A-Coil
Suction Line Insulation Thickness	3/8"
Length	30 feet

Frequently Asked Questions

How does the two-stage burner improve comfort compared to single-stage systems? +

The two-stage design allows the furnace to run at 60% capacity during mild weather, reducing short-cycling and temperature swings. This extends equipment life and maintains more consistent room temperature than single-stage units that cycle on-off frequently. The multi-speed blower complements this by adjusting fan speed to match heating demand.

Can this system be installed in tight spaces like attic or closet locations? +

Yes, the 30x21x21 inch dimensions and upflow/horizontal configuration handle restrictive installations better than larger tonnage units. Verify adequate clearance for the metal flue vent and ensure gas supply and electrical access before installation. Attic installations require proper condensation drainage planning.

Is 14 SEER adequate for my climate, or should I upgrade to 16+ SEER? +

At 14 SEER, this unit suits moderate climates with balanced heating and cooling needs. High-cooling regions see better payback from 16-17 SEER systems within 5-7 years. Run a utility cost analysis comparing operating expenses before deciding, as upfront price difference typically ranges 15-25% higher for premium efficiency.

How does this Goodman system compare to competing mid-tier brands like Carrier or Lennox? +

Goodman competes on price aggressively while matching comparable efficiency ratings (14 SEER, 80% AFUE). Carrier and Lennox units often carry 2-3 year longer warranties and quieter operation (68-70 dB), but cost 20-30% more. Goodman delivers reliable performance at lower cost for contractors focused on project budgets.

What does the 10-year warranty actually cover and exclude? +

The warranty covers defective components like the compressor, heat exchanger, and motor through parts replacement. It typically excludes damage from improper installation, misuse, or lack of maintenance like filter changes and annual service. Review your installer's specific terms on labor coverage, which varies by HVAC company.

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