👋 Let’s Talk HVAC – Plain and Simple
Hey there—Mike Sanders here. I’ve been in the HVAC business long enough to know that most homeowners don’t care about buzzwords or tech specs—they just want a heating and cooling system that works, doesn’t run up the energy bill, and doesn’t break down when it’s freezing or 95 in the shade. Sound familiar?
That’s where this guide comes in. If you’re in the market for a 3–5 ton AC and gas furnace combo, especially one that uses the new R-32 refrigerant, you’ve got options. But how do you choose the right one? I’ll walk you through it all—from sizing the system right to understanding SEER2 ratings, fuel types, and even noise levels.
Let’s make your next HVAC purchase the one you don’t have to think about for the next 15 years.
📏 Step 1: Know What Size You Actually Need
➤ What Does “3–5 Ton” Even Mean?
Nope—it’s not the weight of the unit. When we say 3-ton or 5-ton, we’re talking about cooling capacity. One “ton” equals 12,000 BTUs per hour. So a 3-ton unit moves 36,000 BTUs of heat per hour, and a 5-ton system moves 60,000 BTUs.
➤ So... Which One Do You Need?
A quick rule of thumb is 1 ton per 500–600 square feet, but that’s just a start. Other things matter too:
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Where you live (Texas heat ≠ Oregon cool)
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How well your home is insulated
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Window count and orientation
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Ceiling height
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Ductwork condition
💡 Pro Tip: Don’t guess. Use a Manual J Load Calculation—or hire a contractor who will. You can also get started with an online calculator like this one.
🔥 Step 2: Understand Furnace Fuel Options
➤ Standard Gas Furnace (Most Common)
This is the workhorse of American homes. Natural gas is efficient, affordable, and readily available in most areas.
➤ Dual Fuel Systems
Got access to both natural gas and electricity? Dual fuel systems switch between a heat pump and gas furnace depending on which is more efficient. Great for mild winters or homes with variable energy prices.
For more, check out Carrier’s explanation of dual fuel systems.
➤ Propane or Oil
If you live out in the country and don’t have gas lines, propane or oil furnaces may be your go-to. They work, but fuel prices can fluctuate.
✅ My Take: If you’ve got access to natural gas, stick with it. Dual fuel can save money in some regions—but only if your climate supports it.
⚙️ Step 3: Look at SEER2 and AFUE Ratings
➤ SEER2 for Air Conditioners
SEER2 stands for Seasonal Energy Efficiency Ratio 2—basically, it measures how efficiently your system cools your home. A higher number = less electricity used.
| SEER2 Rating | Efficiency Tier | Good For |
|---|---|---|
| 13.4–14.5 | Standard | Budget-conscious buyers |
| 15–16 | High Efficiency | Most homes |
| 17+ | Premium Efficiency | Hot climates or eco-conscious homes |
Read more about SEER2 standards from AHRI.
➤ AFUE for Furnaces
AFUE stands for Annual Fuel Utilization Efficiency. If your furnace is 96% AFUE, that means 96 cents of every fuel dollar go toward heat.
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80% AFUE: Standard efficiency (typical for older homes or budget installs)
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96%+ AFUE: High efficiency (great for colder climates or long-term savings)
💡 Hot Tip: SEER2 is for cooling; AFUE is for heating. Look at both when buying a combo system.
🌬️ Step 4: Decide on Airflow and Blower Motor Types
Not all blower motors are created equal. Here’s a breakdown:
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PSC Motor: Basic, less efficient, found in budget systems
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ECM (Variable-Speed): Adapts to conditions, quieter, more efficient
Why it matters: Variable-speed systems are better at maintaining even temps and humidity control, especially in two-story homes.
🔇 Step 5: Consider Noise Levels
If your outdoor unit is sitting next to a bedroom window, this one’s for you.
Look for decibel (dB) ratings:
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Below 70 dB: Pretty quiet
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70–75 dB: Moderate (like a dishwasher)
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75+ dB: Noticeable, but manageable
Some manufacturers don’t list this clearly, so don’t hesitate to ask.
🌱 Step 6: R-32 Refrigerant—A Future-Proof Choice
You might’ve seen the term R-32 refrigerant popping up. Here's why it matters:
➤ Why R-32?
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More efficient than R-410A
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Lower Global Warming Potential (GWP)
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Less refrigerant needed per system
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Approved under EPA SNAP rules
According to Daikin, R-32 is 37% lower in GWP compared to R-410A. It’s a win for both performance and the planet.
⚠️ It’s an A2L refrigerant (slightly flammable), but that’s why updated safety codes like UL 60335-2-40 exist—to ensure proper use.
💵 Step 7: What Should This Cost You?
Here’s a ballpark idea:
| System Size | Equipment Only | Installed Cost |
|---|---|---|
| 3 Ton | $2,800–$4,500 | $5,000–$7,500 |
| 4 Ton | $3,200–$4,900 | $5,500–$8,000 |
| 5 Ton | $3,600–$5,500 | $6,000–$9,000 |
Those ranges include furnace + AC + coil. If you’re switching fuel types, adding new ductwork, or upgrading to a variable-speed blower, that’ll add to the bill.
🧾 Step 8: Warranties, Rebates, and Long-Term Value
Before you pull the trigger, check the fine print:
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Parts Warranty: 10 years is the standard (make sure you register it!)
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Compressor Warranty: Often longer on premium models
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Labor Warranty: Usually 1 year unless extended by your installer
Register here if you’re going with Goodman: Goodman Warranty Registration
➤ Rebates and Tax Credits
With the Inflation Reduction Act, you may qualify for:
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Federal tax credits on energy-efficient equipment
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State or utility rebates for high-SEER2 and AFUE systems
Check DSIREUSA.org for local programs.
🔚 Final Thoughts: Don’t Just “Set It and Forget It”
Buying the right system is step one. Keeping it running smoothly means:
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Changing filters regularly
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Scheduling seasonal tune-ups
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Watching for signs of airflow problems
A good system should last you 15–20 years. Take care of it, and it’ll take care of you.
And if you’re ready to explore some of the best 3–5 ton R-32 systems available right now, check out this full collection over at The Furnace Outlet.
🧰 Need Help? Ask Mike.
Still have questions? I’m not some robot—I’m a tech who’s crawled through more attics and basements than I can count. Leave a comment or hit up The Furnace Outlet’s customer service. We’ll help you pick a system you’ll be proud of—one that keeps your family cool in July and warm in January without draining your wallet.
