3.5 Ton Goodman 15.2 SEER2 R32 Heat Pump System GLZS5BA4210, AMST42CU1300
The Goodman 3.5 ton heat pump system matches the GLZS5BA4210 R-32 outdoor unit with the AMST42CU1300 ECM air handler for a 15.2 SEER2, AHRI-certified rating (AHRI #218222711). It produces about 40,500 BTU/h of cooling at 95°F and 39,500 BTU/h of heating at 47°F, with 1,380 CFM of rated airflow. The outdoor unit uses a lower-profile 35-3/4" tall cabinet and a 1/4 HP fan. It's built for homeowners and contractors serving larger homes whose load falls between 3 and 4 tons.
Is a 3.5 Ton Heat Pump System the Right Size?
The half-ton step between 3 and 4 tons matters. When a load calculation lands near 3.5 tons, this system avoids the humidity and short-cycling problems of oversizing without leaving the home short on peak days.
Bonus rooms, vaulted ceilings, large window walls, and older insulation all push loads upward. This size moves to a 1-1/8" suction line, so confirm line set sizing as well as duct capacity for about 1,380 CFM.
Ideal for: Four-bedroom homes, houses with bonus rooms or vaulted ceilings, and larger homes in warm, humid climates.
Need more capacity? Step up to the 4 Ton Goodman 15.2 SEER2 R32 Heat Pump System GLZS5BA4810, AMST48CU1300 for homes with heavier heating and cooling loads.
Recommended sizing is a general guideline only. Actual system requirements depend on insulation, climate, ductwork, windows, occupancy, and home layout. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | GLZS5BA4210 — 3.5 Ton R-32 Heat Pump |
|---|---|
| Indoor Air Handler | AMST42CU1300 Multi-Position ECM Air Handler (C Cabinet) |
| Application | Residential Split System Heat Pump (Heating & Cooling) |
| Refrigerant | R-32 |
| Compressor | Single-Stage Scroll Compressor |
| Efficiency | 15.2 SEER2 — AHRI #218222711 |
| Electrical | 208/230V, Single Phase, 60 Hz Outdoor Unit |
| Air Handler Electrical | 208/240V, Single Phase, 60 Hz |
The GLZS5BA4210 holds 139 oz of factory R-32 charge for 15 feet of line. It uses a 1-1/8" suction line with a 7/8" service valve, so the installer supplies a 7/8" to 1-1/8" adapter. Indoors, the AMST42CU1300 delivers 1,380 CFM with a 3/4 HP ECM blower. Optional heat strips up to 19 kW, 1-1/8" x 3/8" line sets, filters, and thermostats complete the system. Shop more Goodman equipment.
Heat Pump & Air Handler Features
GLZS5BA4210 Outdoor Heat Pump
- About 40,500 BTU/h cooling at 95°F (rated match)
- About 39,500 BTU/h heating at 47°F; 24,000 at 17°F
- Scroll compressor (14.4 RLA / 112.2 LRA)
- 1/4 HP PSC condenser fan motor
- Lower-profile 35-1/2" W x 35-1/2" D x 35-3/4" H cabinet
- 1-1/8" suction line, 7/8" suction valve
- 19.3 A MCA, 30 A max overcurrent protection
- 139 oz factory R-32 charge
- Crankcase heater and suction-line accumulator
- 72 dB rated sound level
AMST42CU1300 Air Handler
- 1,380 CFM rated airflow for 3.5 tons
- Direct-drive 3/4 HP multi-speed ECM blower
- Factory-installed TXV
- All-aluminum coil with coil mounting track
- 21" wide C cabinet
- Less than 2.0% cabinet leakage at 1.0 in. H2O
- Factory R-32 refrigerant sensor
- Screw-less sides and back to reduce condensation
- UL 60335-2-40 compliant, ETL listed
- Heat strip options to 19 kW breakered
Specifications & Manuals
Product documentation includes outdoor heat pump and air handler technical specifications, installation instructions, and Goodman warranty information to assist with equipment selection, installation, and service.
Frequently Asked Questions
When does a 3.5 ton heat pump make more sense than a 3 or 4 ton?
When a load calculation falls between 3 and 4 tons. The GLZS5BA4210 fills that gap so the system isn't undersized on peak days or oversized the rest of the year.
How is the 3.5 ton system different from the 3 ton AMST42CU1300 match?
Both use the AMST42CU1300 air handler. The GLZS5BA4210 outdoor unit adds capacity (about 40,500 vs. 35,400 BTU/h cooling at 95°F), raises airflow to 1,380 CFM, and moves to a 1-1/8" suction line.
Do I need an adapter for the 1-1/8" suction line?
Yes. Goodman notes that installers must supply 7/8" to 1-1/8" adapters, because the suction service valve is 7/8" while the recommended line size is 1-1/8".
How much refrigerant does the GLZS5BA4210 hold from the factory?
Goodman lists a 139 oz R-32 factory charge, sized for 15 feet of 3/8" liquid line. The charge must be adjusted per the installation instructions for other line lengths.
Can this 3.5 ton system be used where winters drop below 0°F?
Goodman requires the OT18-60A outdoor thermostat with lockout in heat pump applications where ambient temperatures fall below 0°F with 50% or higher relative humidity. Heat strips provide backup heat.
Is the GLZS5BA4210 built for coastal environments?
The cabinet is heavy-gauge galvanized steel with a powder-paint finish approved for 500 hours of salt-spray testing, plus a steel louver coil guard.
GLZS5B Technical Specifications
Goodman Warranty Certificate"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).
