The Goodman 2 Ton R-32 Compatible Wall-Mounted Air Handler (Model AWST24SU1308) is a high-efficiency unit designed for modern homes. But one big question homeowners face is: “Should I install this myself, or is it better to hire a pro?”
Installation isn’t just about hanging the unit on a wall—it’s about ensuring safe electrical connections, proper refrigerant handling, and reliable long-term operation. A mistake can cost hundreds in efficiency losses—or even void your warranty.
Mark, a hands-on homeowner who’s tackled HVAC projects himself, shares his experiences:
“I mounted the air handler and ran the drain myself. But when it came time to vacuum the lines and charge refrigerant, I called a pro. That’s not something I wanted to mess up.”
This guide walks you through what’s involved, the pros and cons of DIY vs. pro installs, and where a hybrid approach makes the most sense.
🔧 What Installation Involves
Installing the Goodman AWST24SU1308 (or similar wall-mounted air handlers) includes several key steps:
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Mounting the unit – Anchoring securely to studs or wall brackets.
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Refrigerant line connections – Linking to the outdoor condenser, typically with copper line sets.
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Electrical wiring – 208/230V single-phase power plus low-voltage control wiring.
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Drain line setup – Ensuring condensation is carried away properly.
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Refrigerant charging & testing – Evacuating air, checking for leaks, and setting refrigerant charge.
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Final testing – Running the system to confirm airflow, temperature split, and operation.
👉 According to the DOE, poor installation can reduce HVAC efficiency by up to 30% (DOE Energy Saver Guide).
👨🔧 DIY Installation: Pros & Cons
✅ Pros of DIY
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Save money – Labor can range $1,000–$2,000 depending on location.
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Hands-on control – You understand your system better for future maintenance.
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Satisfaction – Pride in completing a big home project.
❌ Cons of DIY
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Specialized tools required – Vacuum pump, micron gauge, manifold set, torque wrenches.
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Refrigerant handling – Federal law (EPA Section 608) requires certification to purchase or handle refrigerants (EPA Section 608).
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Risk of mistakes – Over/undercharging refrigerant, improper wiring, or poor drainage can cause system failure.
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Warranty concerns – Goodman often requires professional installation for warranty coverage.
Mark recalls:
“I thought about charging refrigerant myself, but when I saw the tool cost and certification requirements, I realized it would have cost me more than just paying an HVAC tech for that part.”
🏠 Pro Installation: Pros & Cons
✅ Pros of Hiring a Pro
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Code-compliant work – Ensures safety and local permit requirements.
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Proper refrigerant charging – Accurate charging improves performance and lifespan.
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Warranty protection – Most manufacturers, including Goodman, require licensed installation.
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Time savings – A pro can complete in hours what might take a DIYer days.
❌ Cons of Hiring a Pro
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Cost – Higher upfront investment.
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Less involvement – You miss the DIY learning opportunity.
👉 The Building Performance Institute (BPI) notes that incorrect installation is one of the leading causes of HVAC underperformance and early failure (BPI Resources).
Mark explains:
“When I compared my DIY time and tool costs, I realized paying a pro for the critical steps was actually cheaper. I still did some prep work myself to save money.”
⚡ Hybrid Approach: Best of Both Worlds
For many homeowners, the hybrid approach makes the most sense:
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DIY portions:
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Wall mounting
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Running drain lines
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Installing line set covers
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Pulling electrical conduit (if code allows)
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Pro portions:
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Brazing/flare connections
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Pulling vacuum with a micron gauge
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Charging refrigerant (R-32 requires precision)
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System testing and startup
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This way, you save money on labor-intensive but low-risk tasks while leaving the technical refrigerant work to licensed pros.
🛠️ Tools Needed for DIY
If you plan to tackle parts of the install, here’s what you’ll need:
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Basic tools: Drill, stud finder, level, wrenches.
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HVAC-specific tools: Vacuum pump, digital micron gauge, manifold gauges, torque wrench, flaring tool.
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Safety gear: Insulated gloves, eye protection, electrical tester.
👉 ACCA recommends only trained or certified technicians handle refrigerant lines due to safety and performance risks (ACCA HVAC Safety Standards).
💲 Cost Comparison: DIY vs. Pro
| Task | DIY Cost | Pro Cost |
|---|---|---|
| Mounting unit | $0 (tools only) | $200–$400 |
| Drain line | $20–$50 | $200–$300 |
| Electrical wiring | $100–$300 | $300–$600 |
| Refrigerant tools | $500–$1,000 | N/A (included) |
| Vacuum & charging | N/A (requires certification) | $500–$800 |
| Total | $600–$1,300 | $1,500–$2,500 |
👉 Even partial DIY can save $500–$1,000 while still ensuring pro-level system performance.
🪟 Common DIY Mistakes (and How to Avoid Them)
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Improper mounting → Leads to vibration and noise.
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✅ Always secure to studs, use level, and check manufacturer’s clearance guidelines.
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Poor drain line slope → Causes water leaks.
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✅ Maintain ¼” per foot slope, use traps where required.
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Electrical shortcuts → Risk of shocks or fire.
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✅ Always use proper gauge wire, breakers, and follow NEC code.
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Skipping the vacuum step → Leads to moisture in system, damaging compressor.
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✅ Only a micron gauge can confirm system dryness.
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Mark learned the hard way:
“On my first attempt years ago, I skipped insulating the suction line properly. My system iced over in a week. Never again.”
📊 DIY vs. Pro: Decision Guide
Ask yourself these questions:
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Do I have electrical and plumbing experience?
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Am I EPA 608 certified (or willing to hire for refrigerant charging)?
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Do I want warranty coverage?
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Am I comfortable spending $500+ on specialty tools?
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How much time do I realistically have for the project?
If you answered no to most, pro installation is best. If you answered yes to some, a hybrid approach could save you money.
💡 Mark’s Final Takeaway
Mark’s advice is clear:
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“Do the parts you’re comfortable with, but leave the refrigerant to the pros. It’s not worth risking a brand-new system just to save a few bucks.”
The Goodman AWST24SU1308 was built with flexibility and efficiency in mind—but whether you install it DIY, hire a pro, or split the tasks, the goal is the same: a safe, efficient, and long-lasting comfort system for your home.
In the next topic we will know more about: 8 kW Heater Option: Do You Need Backup Heat in Your Setup?
