Through-the-Wall AC vs. Window Unit: Which One Deserves Your Wall?

💸 Installation: Cost, Labor, and Drama

Through-the-Wall AC Installation

Installing a wall unit means cutting into your wall and mounting a metal sleeve to hold the unit. That takes a bit more labor—and sometimes a pro.

You’ll need:

• Framing support

• Wall sleeve (many are universal)

• Caulking and weatherproofing

• Possibly a 220V electrical circuit

Typical install cost: $300–$700 depending on complexity and local rates.

Window AC Installation

Window units just slide in—no special framing, no holes in the wall. But they often leave gaps where air escapes or pests sneak in. 

You might need:

• Adjustable accordion side panels

• Window locks for security

• A support bracket for heavier units

DIY-friendly, sure—but not airtight.

🧱 Efficiency & Energy Use: The Hidden Cost

Wall Units Are Built to Seal

Through-the-wall air conditioners are surrounded by insulation, not dangling from a sash. That matters. Sealing a window unit properly is tough—especially with older or warped frames.

That air leakage? It adds up.

Energy Vanguard explains how window units compromise your home’s thermal envelope. On hot days, they pull in outdoor air—and on cold days, they leak heat like a sieve.

Wall ACs, on the other hand, are better sealed and often come ENERGY STAR–rated. You get less temperature swing and lower energy bills.

Want to compare models and efficiency ratings? The AHRI Directory is the go-to source for verified specs.

🔇 Sound Off: Which Unit is Quieter?

Let’s be honest—nobody wants to sleep next to a jet engine. Window ACs are louder because:

• They rattle inside a less stable frame

• Vibrations echo in the window opening

• They're often made with cheaper materials

Through-the-wall units are better insulated and installed more firmly. Most produce under 55 decibels, about the sound of a quiet conversation.

Still, if peace and quiet are top priorities, look for models with a low decibel rating and a “sleep mode” function.

The Consumer Reports Room AC Buying Guide has solid insight into noise ratings and what to expect.

🏠 Aesthetic Appeal: Let’s Talk Looks

We’re visual creatures. Through-the-wall ACs:

✅ Sit flush with your interior wall
✅ Preserve your window view
✅ Can even be painted around to match the room

Compare that with a window unit that blocks sunlight, sticks out the back of the house, and usually comes in “dingy off-white” 🧌.

If you care about curb appeal, through-the-wall wins this round, no contest.

🛠️ Maintenance & Durability

Window Units

• Easy to remove and clean

• Susceptible to theft and water damage if not stored properly

• Usually last 5–7 years

Wall Units

• Stay put all year (no storage stress)

• Better protected from rain and debris

• With good care, can last 10–15 years

Tip: Regardless of type, clean your filters every month during peak cooling. It keeps your air clean and your energy bills down. The EPA Indoor Air Quality resource is worth a read.

⚡ Which Uses Less Power?

This one depends more on model and efficiency rating than AC type. That said, through-the-wall ACs tend to:

• Have higher EER and SEER ratings

• Be designed for permanent, efficient operation

• Feature R-32 refrigerant (in newer models), which cools more efficiently and has a lower environmental impact

Want proof? Check out Daikin’s R-32 efficiency analysis.

🔐 Security: Yes, It Matters

Let’s not forget—window units are removable. That’s a security risk, especially on ground floors.

Through-the-wall units? They’re bolted in. Unless someone brings a crowbar and an hour of time, they’re not getting in through your wall AC.

🏆 Winner by Use Case

🎯 Final Verdict: Which Should You Choose?

Go with a Through-the-Wall AC if you:

• Own your home or plan to stay long-term

• Want better energy efficiency and comfort

• Value aesthetics and a quieter experience

• Don’t mind spending a bit more upfront

Choose a Window AC if you:

• Are renting or moving soon

• Need a low-cost, plug-and-play solution

• Don't want to modify walls or hire help

• Plan to cool only for a few weeks a year

If you’re leaning toward a permanent, efficient solution—check out the through-the-wall ACs available now at The Furnace Outlet. Many models use modern R-32 refrigerant, come ENERGY STAR–rated, and ship ready for DIY or pro installation.

🧠 Mark’s Pro Tips Before You Buy

1. Measure your wall opening or window twice before purchasing anything. Trust me.

2. Consider amperage and voltage. Some through-the-wall units require 220V.

3. Always check decibel ratings if the unit goes in a bedroom.

4. Look for rebates! DSIRE is your go-to tool.

5. Don’t just buy the cheapest unit—spend a little more and save in the long run.

💬 Final Thoughts

You don’t have to settle for bulky, leaky window units if you’re ready to commit to comfort. Through-the-wall air conditioners may take a bit more effort to install, but they give you better airflow, lower noise, and long-term savings.

And hey—when your friends walk in and say, “Wait, where’s your AC?” you’ll just smile. Because it's doing its job... quietly and beautifully built into your wall.

⚙️Stay sharp. Stay efficient. Stay ahead. - Mark⚙️