3 Ton Goodman 15.2 SEER2 R-32 Heat Pump System – GLZS4BA3610 & AMST42CU1300
The Goodman GLZS4BA3610 and AMST42CU1300 make a simple, budget-friendly 3 ton heat pump system for homeowners and contractors who want dependable heating and cooling without paying for features they won't use. This matched R-32 split system pairs a single-stage scroll heat pump rated at 15.2 SEER2 and 7.8 HSPF2 with a multi-position, multi-speed ECM air handler. Together they deliver a nominal 36,000 BTU/h for mid-size homes, rental properties and straightforward heat pump replacements, with electric heat strips available for backup heat.
Is a 3 Ton Heat Pump System the Right Size?
This system is rated at 36,000 BTU/h of cooling and 36,000 BTU/h of heating, which covers many mid-size single-family homes. Capacity should match the home's actual heat gain and heat loss, not just its floor area. Two homes of the same size can need different tonnage depending on construction and exposure. Try our AC tonnage and BTU calculator for a quick estimate, then confirm with a Manual J load calculation.
Insulation, window size and orientation, attic temperature, duct leakage, number of occupants and your local winter design temperature all change the load. Because the GLZS4BA3610 is a single-stage heat pump, getting the size right matters even more. A system that is too large cycles on and off quickly and removes less humidity, while one that is too small runs constantly on peak days and relies more on the heat strip in winter.
Ideal for: Mid-size single-family homes, rental and investment properties, builder projects, and like-for-like replacement of older 3 ton heat pump systems.
Need more capacity? Step up to the 3.5 Ton Goodman GLZS4BA4210 & AMST42CU1300 Heat Pump System, which uses the same air handler with a larger outdoor unit.
Recommended applications are general guidelines only. Actual system requirements depend on insulation, climate, duct design, window load, occupancy and desired indoor temperature. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Outdoor Heat Pump | GLZS4BA3610 — 3 Ton Single-Stage R-32 Heat Pump Condenser |
|---|---|
| Indoor Air Handler | AMST42CU1300 Multi-Position Multi-Speed ECM Air Handler (21" Cabinet) |
| Application | Residential Ducted Split System Heat Pump — Heating & Cooling |
| Refrigerant | R-32 |
| Compressor | Single-Stage Scroll Compressor |
| Backup Heat | Electric Heat Strip Selected at Checkout (5, 8, 10 or 15 kW) |
| Electrical | 208/230V, Single Phase, 60 Hz Heat Pump |
| Air Handler Electrical | 208/240V, Single Phase |
The GLZS4BA3610 is the first size in the GLZS4B line to use a scroll compressor; the smaller models use rotary compressors. It ships with 83 oz of R-32, charged for 15 feet of 3/8" liquid line, and connects through 3/8" liquid and 7/8" suction sweat valves. Indoors, the AMST42CU1300 has a factory-installed TXV, an R-32 refrigerant sensor and a 3/4 HP multi-speed ECM blower with nine speed taps, so the installer can set airflow to suit the duct system. Each component is also sold individually: the GLZS4BA3610 heat pump condenser and the AMST42CU1300 air handler.
Heat Pump & Air Handler Features
GLZS4BA3610 Outdoor Heat Pump
- High-efficiency single-stage scroll compressor
- 15.2 SEER2 and 7.8 HSPF2 efficiency rating
- SmartShift technology for quiet, reliable defrost
- 5mm enhanced aluminum fin coil
- Single-speed PSC condenser fan motor
- Factory-installed bi-flow filter drier, suction accumulator and crankcase heater
- Fully enclosed contactor with lug connection and extended-life capacitors
- Heavy-gauge galvanized-steel cabinet with steel louver coil guard
- Architectural Gray powder-paint finish with 500-hour salt-spray approval
- Meets 2023 Florida Building Code hurricane-wind requirements when properly anchored
AMST42CU1300 Multi-Speed Air Handler
- 3/4 HP direct-drive, multi-speed ECM blower motor
- Internal factory-installed thermal expansion valve
- Factory-installed R-32 sensor designed for the lifespan of the coil
- All-aluminum evaporator coil with coil mounting track for quick repositioning
- Rigid SmartFrame cabinet, 21" wide C cabinet
- Horizontal or vertical configuration with 21" depth for attic access
- DecaBDE-free thermoplastic drain pan with secondary drain connections
- Screw-less sides and back with foil-faced insulation to reduce condensation
- Cabinet air leakage under 2.0% at 1.0" H2O (ASHRAE 193)
- Tool-less filter access; field-installed 3–25 kW heater kits available
Specifications & Manuals
Product documentation includes GLZS4B and AMST technical specifications, R-32 installation and service instructions for both components, and Goodman warranty certificates for the heat pump and air handler.
Frequently Asked Questions
Is the GLZS4BA3610 a single-stage or two-stage heat pump?
It is single-stage. The GLZS4BA3610 uses one high-efficiency scroll compressor that runs at full capacity whenever it is on. That keeps the design simple and the price lower than two-stage systems.
Why is a 3 ton heat pump matched with a 3.5 ton AMST42CU1300 air handler?
Goodman uses the AMST42CU1300 across several GLZS4B sizes, and this 3 ton combination is the one this 15.2 SEER2 system is rated on. Its nine-speed ECM blower lets the installer set airflow for a 3 ton outdoor unit.
What copper line set does this 3 ton system need?
The condenser uses 3/8" liquid and 7/8" suction connections, and 25' and 50' 7/8" & 3/8" insulated line sets are offered as options. The air handler coil has a 3/4" suction connection. Goodman's sizes are recommended for line runs of 79 feet or less; longer runs should follow Goodman's TP-110 R-32 long line guidance.
What electrical circuits does this heat pump system require?
The GLZS4BA3610 needs a 21.5 amp minimum circuit ampacity and 35 amp max overcurrent protection. The air handler circuit depends on the heat strip; for example, a 10 kW kit requires 49/55.9 MCA at 208/240V. A licensed electrician should confirm the final wire and breaker sizes.
What warranty does Goodman provide on this system?
If registered online within 60 days of installation, the GLZS4B heat pump carries a 10-year parts limited warranty and the AMST air handler carries a 12-year parts limited warranty. Without registration, parts are covered for 5 years. Terms vary in Texas, Florida, California and Québec; see the warranty certificates above.
Is there a cooling-only version of this 3 ton system?
Yes. The 3 Ton Goodman GLXS4BA3610 & AMST42CU1300 A/C System pairs the same air handler with an R-32 air conditioner for homes that heat with another source.
GLZS4B Technical Specifications
