3.5 Ton Goodman 15.2 SEER2 R32 A/C System GLXS5BA4210, AMST42CU1300
This system is built for larger homes that fall between 3 and 4 tons. It combines the 42,000 BTU/h GLXS5BA4210 high-efficiency condenser with the AMST42CU1300 air handler under AHRI certificate #215380889 at 15.2 SEER2. The GLXS5BA4210 is the first size in the series with a factory-installed crankcase heater and a larger 1/4 HP condenser fan motor. It suits homeowners who want premium rated efficiency and precise half-ton sizing. It uses R-32 refrigerant and a scroll compressor, and it's cooling only with optional field-installed Goodman electric heat strips.
Is a 3.5 Ton Air Conditioning System the Right Size?
A 3.5 ton system supplies 42,000 BTU/h of nominal cooling. It's often used in larger single-family homes, somewhere near 1,800–2,100 sq. ft. as a rough reference. It's the right call when a load calculation lands clearly between 3 and 4 tons.
Choosing the half-ton size instead of rounding up keeps run cycles long enough to manage humidity, which matters in Florida and other humid climates. Open great rooms, bonus rooms over garages, west-facing glass and duct runs through hot attics all push the load toward the upper end of this range.
Ideal for: Larger single-story homes, two-story homes with bonus rooms and open-concept layouts that need more than 3 tons but less than 4.
Need more capacity? Step up to the 4 Ton Goodman 15.2 SEER2 R32 A/C System GLXS5BA4810, AMST48CU1300 for bigger homes with heavier loads.
Recommended home sizes are general guidelines only. Actual system requirements depend on insulation, climate, windows, ductwork, occupancy and a proper load calculation. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Condensing Unit | GLXS5BA4210 — 3.5 Ton High-Efficiency R32 Split System Air Conditioner |
|---|---|
| Indoor Air Handler | AMST42CU1300 Multi-Position ECM Air Handler (C Cabinet, 21" Wide) |
| Application | High-Efficiency Cooling-Only Split System (Electric Heat Kit Optional) |
| Refrigerant | R-32 |
| Compressor | Single-Stage High-Efficiency Scroll Compressor with Factory Crankcase Heater |
| Metering Device | Factory-Installed Internal Thermal Expansion Valve (TXV) |
| Electrical | 208/230V, Single Phase, 60 Hz Condensing Unit — 19.3 MCA / 30A Max Overcurrent |
| Air Handler Electrical | 208/240V, Single Phase — 5.9 MCA / 15A Max Overcurrent (No Heat Kit) |
The GLXS5BA4210 condenser measures 35-1/2" x 35-1/2" x 36-1/2" and weighs 250 lbs, with a 141 oz. factory R-32 charge and a 74 dBA sound rating. Goodman lists a 1-1/8" suction line for 25 ft. runs with a 7/8" service valve, and any adapter is field supplied. The 53-7/16" AMST42CU1300 is the same air handler used in the 3.5 ton GLXS4 system, so the GLXS5 upgrade happens entirely outdoors. For year-round heating, see the 3.5 ton Goodman GLZS5 R32 heat pump system.
Condensing Unit & Air Handler Features
GLXS5BA4210 Outdoor Condensing Unit
- 42,000 BTU/h nominal cooling capacity
- High-efficiency single-stage scroll compressor
- Factory-installed crankcase heater
- 1/4 HP PSC condenser fan motor
- 74 dBA rated sound level
- 141 oz. factory R-32 charge for 15 ft. of tubing
- 1-1/8" suction line recommended (7/8" service valve)
- Capacitors with extended life
- Top and side maintenance access
- 2023 Florida Building Code hurricane-wind compliant when anchored
AMST42CU1300 Multi-Position Air Handler
- 42,000 BTU/h nominal capacity in a 21" C cabinet
- ¾ HP multi-speed ECM blower with nine speed taps
- Internal factory-installed TXV
- All-aluminum evaporator coil
- Upflow or horizontal, with a DFKE-02 downflow kit available
- Rigid SmartFrame™ cabinet with screw-less sides and back
- Foil-faced insulation covers the internal casing
- Optional HHK0005 high humidity kit
- Tool-less 19.5" x 20" filter access
- Field-installed HKTS heat kits from 3 kW to 19 kW
Specifications & Manuals
Documentation includes GLXS5BA4210 charge, electrical and dimensional data, AMST42CU1300 airflow tables and heat kit ratings, plus complete installation instructions.
Frequently Asked Questions
Does the GLXS5BA4210 come with a crankcase heater?
Yes. Goodman lists a factory-installed crankcase heater on the GLXS5BA4210, GLXS5BA4810 and GLXS5BA6010. On the smaller GLXS5 models, a crankcase heater is an add-on accessory.
Why is the 3.5 ton GLXS5 shorter than the 3 ton?
The GLXS5BA4210 uses a different chassis, 35-1/2" x 35-1/2" x 36-1/2", which is 3" shorter than the 3 ton's 39-1/2". It's heavier at 250 lbs and runs a larger 1/4 HP fan motor.
How does this compare to the 3.5 ton GLXS4 system?
Both use the AMST42CU1300 air handler. The GLXS5BA4210 raises the rating to 15.2 SEER2, from 14.5 SEER2 on the GLXS4 match. It also carries 141 oz. of factory charge versus 83 oz. and adds a factory crankcase heater.
What is the LSK02A liquid line solenoid kit used for?
A liquid line solenoid closes the liquid line during the off cycle, which helps limit refrigerant migration. Goodman lists the LSK02A as an optional accessory for the GLXS5BA4210.
What voltage range does the GLXS5BA4210 operate within?
Goodman rates it for 208/230V single-phase power with a minimum of 197V and a maximum of 253V. If supply voltage falls outside that range, have an electrician check it before startup.
What conduit size is used for the GLXS5BA4210 power wiring?
Goodman lists a 1/2" or 3/4" electrical conduit size. Wire gauge should be determined by the National Electrical Code, and long runs may need larger wire.
GLXS5 Technical Specifications
GLXS Installation Manual
AMST Installation Manual"SEER2" stands for Seasonal Energy Efficiency Ratio 2. Specifically, SEER2 is the total heat removed from the conditioned space during the annual cooling season. The M1 testing procedure will increase systems' external static pressure by a factor of five to better reflect field conditions of install equipment. With this change, new nomenclature will be used to denote M1 ratings (including EER2 and HSPF2).
