3.5 Ton Goodman 15.2 SEER2 R-32 100K BTU Two-Stage Gas Package Unit GPGM54210031
The Goodman GPGM54210031 is where the GPGM5 line steps up to a 100K BTU furnace. Its two-stage, five-burner gas section fires at 75,000 or 100,000 BTU input and delivers up to 81,000 BTU of heat at 81% AFUE. Its two-stage scroll compressor provides 41,500 BTUh of total cooling at 15.2 SEER2. With a 3/4 HP variable-speed ECM blower, the series' largest R-32 charge, and Low NOx compliance, it suits larger homes and small businesses that need both more cooling and noticeably more heat. Browse all 3.5 ton gas package units.
Is a 3.5 Ton Two-Stage Gas Package Unit the Right Size?
A 3.5 ton unit fits cooling loads of about 40,000 to 42,000 BTUh, which is common for larger ranch homes, two-story homes on one system, and commercial spaces with equipment loads. Compared with the 3 ton GPGM5, it adds 5,900 BTUh of total cooling. More importantly for colder regions, heating output rises from 64,800 to 81,000 BTU at high stage.
That combination makes the GPGM54210031 a good match for homes in four-season climates with higher heat loss. On mild days, low stage (75,000 BTU input) keeps temperatures steady without overshooting. Size both cooling and heating from a load calculation before ordering.
Ideal for: Larger homes in mixed and colder climates, two-story homes on a single system, and small commercial spaces with 3.5 ton cooling loads and higher heating demand.
Need more capacity? Step up to the 4 Ton Goodman Two-Stage Gas Package Unit GPGM54810031 for more cooling with the same 100K furnace.
Recommended applications are general guidelines only. Actual system requirements depend on insulation, ductwork, climate, window area, occupancy, and a proper load calculation. Request free sizing assistance, contact Budget Heating, or call 813-885-7999.
What's Included
| Package Unit | GPGM54210031: 3.5 Ton Two-Stage Gas/Electric Package Unit |
|---|---|
| Cooling Capacity | 41,500 BTUh Total / 30,040 BTUh Sensible, 1,225 CFM |
| Gas Heating | 100,000 / 75,000 BTU Input (Two-Stage); 81,000 / 60,750 BTU Output; 81% AFUE |
| Efficiency | 15.2 SEER2 / 11.5 EER2 |
| Refrigerant | R-32, Factory Charged (118 oz.), TXV Metering |
| Compressor | Two-Stage Scroll Compressor |
| Airflow Configuration | Convertible Horizontal or Downflow |
| Electrical | 208/230V, Single Phase, 60 Hz; 29.8 MCA, 45 Amp Max Overcurrent |
The GPGM54210031 ships at about 410 lb in the large chassis (47 x 51 inch footprint, 16 x 18 inch duct openings) and fits the shared D14CRBPGCHMA roof curb. For installations above standard elevations, Goodman lists the HA-03 high-altitude kit. Pair it with the LPM-08 propane kit if needed, and the SQRPGH103 square to round adapter for round horizontal ducts. Compare all gas heat and air conditioning package units.
Cooling & Gas Heating Features
GPGM54210031 Air Conditioning Section
- 41,500 BTUh total cooling at 15.2 SEER2
- Two-stage scroll compressor (18 RLA / 126 LRA)
- 3/4 HP variable-speed ECM blower, 1,225 CFM
- 118 oz. R-32 charge, the largest in the GPGM5 series
- 14.9 sq ft, 2-row condenser coil
- 5.7 sq ft all-aluminum evaporator coil
- TXV refrigerant metering
- Loss-of-charge and high-pressure protection
- 76 dB sound rating
- AHRI Certified, UL Listed
GPGM54210031 Gas Furnace Section
- First GPGM5 size with a 100K BTU furnace
- 75,000 / 100,000 BTU two-stage input
- 60,750 / 81,000 BTU output at 81% AFUE
- Five burners with power-assisted combustion
- T-140 aluminized steel tubular heat exchanger
- 35–65°F temperature rise range
- Microprocessor-controlled direct spark ignition
- California Low NOx compliant (40 ng/J)
- HA-03 high-altitude kit available
- 99-year heat exchanger limited warranty with registration
Specifications & Manuals
Product documentation includes GPGM5 technical specifications with expanded cooling, airflow, dimensional, and accessory data, installation instructions, and Goodman warranty terms to assist with equipment selection, installation, and service.
Frequently Asked Questions
How does the 3.5 ton GPGM54210031 compare with the 3 ton?
Total cooling rises from 35,600 to 41,500 BTUh, and the furnace steps up from 80K/60K to 100K/75K BTU input with five burners. Airflow increases slightly, to 1,225 CFM. Electrical moves to 29.8 MCA with a 45 amp breaker.
Why does the 3.5 ton GPGM5 hold more refrigerant than the larger sizes?
Goodman's specifications list a 118 oz. R-32 charge for the 3.5 ton, compared with 82 oz. on the 4 ton and 100 oz. on the 5 ton. Charge varies with each size's coil design. Always verify charge against the unit's rating plate.
How does two-stage cooling help with humidity?
On moderate days, the compressor runs on low stage for longer cycles, giving the evaporator coil more time to remove moisture. That helps keep indoor air drier and more comfortable than single-stage cycling.
Does the 3.5 ton GPGM5 use the same roof curb as smaller sizes?
Yes. Goodman's D14CRBPGCHMA roof curb fits all 2–4 ton GPGM5 models, which simplifies future replacements or upgrades within that range.
Is a high-altitude kit available for the GPGM54210031?
Yes. Goodman lists the HA-03 high-altitude kit for 2–4 ton GPGM5 units. Follow the installation instructions for altitude adjustments.
How much does the 3.5 ton GPGM5 weigh?
Goodman lists an operating weight of 380 lb and a shipping weight of 410 lb for the GPGM54210031.
GPGM5 Technical Specifications