When it comes to installing a new AC unit—especially one that uses next-gen refrigerant like R32—you want it done right the first time. The Goodman GPCH33631 isn’t just another air conditioner. It’s a high-efficiency, environmentally-conscious unit that deserves a careful and informed installation process.
If you're planning to DIY or just want to understand what your installer is doing, here’s what you should know.
Step 1: Understand Your Layout
The GPCH33631 is a horizontal packaged system, which makes it a great fit for attics, crawl spaces, or limited-space utility rooms. You’ll need to account for:
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Clearance for ventilation
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Access for electrical and drain lines
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Proper airflow direction
Start by reviewing Goodman’s official installation guide (PDF)—it outlines approved configurations and clearances based on your home’s layout.
Step 2: Handle R32 Safely
R32 is a low-GWP A2L refrigerant, which means it’s mildly flammable. While it’s much safer than older options like R22, you still need a certified HVAC technician to handle refrigerant lines and pressurization.
According to ASHRAE Standard 15.2, R32 systems must include leak detection and proper ventilation during service. If your tech isn’t A2L-trained, stop and hire one who is.
Step 3: Secure Permits and Follow Codes
Before installation, check with your city or county on mechanical permit requirements. In most regions, replacing or installing an air conditioner like this requires:
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A building/mechanical permit
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Electrical inspection (for the 208–230V hookup)
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Post-installation pressure test
If you're not sure where to start, you can reference Energy Star’s HVAC contractor checklist to make sure your installer covers the basics.
Step 4: Install the Unit
Here’s a basic rundown of how the system gets set up:
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Mount the unit on a level pad or risers (never directly on bare ground).
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Connect the supply and return ductwork, ensuring minimal air leaks.
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Run the refrigerant lines, ensuring no sharp bends or heat exposure.
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Hook up the electrical supply, thermostat wiring, and condensate drain.
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Charge and test the refrigerant system to spec.
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Run final diagnostics for airflow, temperature split, and voltage balance.
Step 5: Register and Maintain
Goodman offers a strong warranty on this unit, but it only kicks in if you register the product within 60 days of installation. You can do that on the Goodman product registration page.
You’ll also want to:
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Replace air filters every 1–3 months
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Schedule biannual maintenance
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Keep the unit clean and debris-free
To better understand refrigerant maintenance, check out ACHR News’ guide on R32 servicing.
Why the GPCH33631 Is Worth It
I personally recommend the Goodman 3 Ton R32 Horizontal AC Unit to any homeowner looking for a budget-friendly, eco-conscious, and powerful cooling solution. The fact that it runs on R32 makes it future-ready, and Goodman’s reputation for durability is well-earned.
Plus, this unit is compatible with smart thermostats, making it easier to control from anywhere. More on that in our next post: “Can I Make My Horizontal AC Unit Smart? Yes—Here’s How.”
