3.5 Ton Goodman 15.2 SEER2 R32 Heat Pump System GLZS4BA4210, AMST42CU1300
With a sound rating of 72 decibels, the GLZS4BA4210 is the lowest-rated model for sound in Goodman's GLZS4B lineup, and this system matches it with the AMST42CU1300 air handler for 42,000 BTU/h of R-32 heating and cooling. Certified at 15.2 SEER2 under AHRI #215213860, it is built for larger homes and households where the outdoor unit sits near patios, pools, or neighboring windows and quieter operation is a priority.
Is a 3.5 Ton Heat Pump System the Right Size?
At 42,000 BTU/h, a 3.5 ton heat pump handles larger homes and higher-load situations: big open floor plans, homes with lots of glass, or hot climates where a 3 ton runs nearly nonstop in summer. It also fills the gap for homes that land between 3 and 4 tons on a load calculation.
Larger systems are less forgiving of duct problems. At this size, return air sizing and supply duct design have a big effect on comfort and noise inside the home. Climate, insulation, and occupancy still drive the load, so a Manual J calculation and a duct check are both worth doing before you replace.
Ideal for: Larger single-family homes, open-concept layouts, homes with outdoor living spaces near the condenser, and replacement of an existing 3.5 ton system.
Need more capacity? Step up to the 4 Ton Goodman 15.2 SEER2 R32 Heat Pump System GLZS4BA4810, AMST48CU1300 for even larger heating and cooling loads.
Recommended system sizes are general guidelines only. Actual heating and cooling requirements depend on insulation, climate, windows, ductwork, ceiling height, and occupancy. A Manual J load calculation is the best way to confirm sizing. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | GLZS4BA4210 — 3.5 Ton R-32 Single-Stage Heat Pump Condenser |
|---|---|
| Indoor Air Handler | AMST42CU1300 — 3.5 Ton Multi-Position ECM Air Handler with Internal TXV |
| System Rating | 15.2 SEER2, 42,000 BTU/h Nominal, AHRI #215213860 |
| Refrigerant | R-32 |
| Compressor | Single-Stage Scroll Compressor |
| Defrost | SmartShift® Defrost Technology |
| Electrical | 208/230V, Single Phase, 60 Hz Heat Pump — MCA 19.3 A, Max Breaker 30 A |
| Air Handler Electrical | 208/240V, Single Phase — 3/4 HP ECM Blower, 21" C Cabinet |
The 3.5 ton GLZS4BA4210 is the first size in the line with a 1/4 HP condenser fan and a 1-1/8" recommended suction line, so plan for a 1-1/8" x 3/8" copper line set and 7/8" to 1-1/8" adapters at the 7/8" service valve. Interestingly, its 19.3 A minimum circuit ampacity is lower than the 3 ton model's. A breakered 19 kW heat strip is available for colder climates; see our Goodman heat strips for details.
Heat Pump & Air Handler Features
GLZS4BA4210 Outdoor Heat Pump
- 42,000 BTU/h nominal heating and cooling
- 72 dB sound rating, lowest in the GLZS4B series
- Single-stage scroll compressor (14.4 RLA)
- 1/4 HP PSC condenser fan motor
- SmartShift® defrost technology
- 139 oz factory R-32 charge for 15 feet of line
- Factory-installed bi-flow filter drier and suction accumulator
- 35-1/2" W x 35-1/2" D x 35-3/4" H cabinet, 262 lbs
- Heavy-gauge galvanized-steel cabinet with powder-paint finish
- Meets 2023 Florida Building Code wind requirements when anchored
AMST42CU1300 Multi-Position Air Handler
- Full 3.5 ton rating, matched to the GLZS4BA4210
- 10" x 8" blower with 3/4 HP multi-speed ECM motor
- Factory-installed TXV and R-32 refrigerant sensor
- 21" C-width SmartFrame™ cabinet
- Vertical or horizontal installation
- All-aluminum evaporator coil
- Galvanized, leather grain-embossed finish
- Tool-less access to a 19.5" x 20" filter
- UL 60335-2-40 compliant, AHRI certified, ETL listed
- Heat strip options up to 19 kW breakered on this listing
Specifications & Manuals
See the GLZS4B technical specifications for line sizing notes and adapter requirements, and the AMST R32 installation manual for blower tap settings and heat kit installation.
Frequently Asked Questions
What type of home is the 3.5 ton GLZS4BA4210 system built for?
It fits larger homes with a 42,000 BTU/h load, such as open-concept layouts, homes with a lot of glass, or homes in hot climates that land between 3 and 4 tons on a load calculation.
What is the sound rating of the GLZS4BA4210?
Goodman rates the GLZS4BA4210 at 72 decibels, the lowest sound rating in the GLZS4B series, which ranges from 72 to 77 dB.
Do I need adapters for the suction line on the GLZS4BA4210?
Yes. Goodman recommends a 1-1/8" suction line, but the service valve is 7/8". The spec sheet notes the installer supplies 7/8" to 1-1/8" adapters.
How much refrigerant is in the GLZS4BA4210 from the factory?
The unit ships with 139 oz of R-32, enough for 15 feet of 3/8" liquid line. The installer adjusts the charge for the actual line length.
What is the largest heat strip available for this 3.5 ton system?
This listing offers up to a 19 kW breakered heat strip (HKSC-20DB / HKTSD20DB / WKS2002B) for homes in colder climates.
How does the 3.5 ton system compare to the 3 ton GLZS4BA3610?
The 3.5 ton adds 6,000 BTU/h, uses a 1/4 HP fan, is rated 15.2 SEER2 versus 15, and has a lower sound rating at 72 dB. It needs a 30 A maximum breaker versus 35 A for the 3 ton.
GLZS4B Technical SpecificationsGLZS Installation ManualGLZS Warranty CertificateAMST Technical SpecificationsAMST Installation ManualAMST Warranty Certificate
