If you’re planning to cool a small apartment, office, or bedroom, you may be deciding between a through-the-wall air conditioner (like the Amana 9,300 BTU PBC093J00AA) and a window air conditioner. Both are popular for small spaces, but each has unique pros, cons, and suitability factors.
This comprehensive guide helps you choose the right system, optimize your energy bills, and ensure your investment fits your lifestyle and space.
🛠️ What is a Through-the-Wall AC?
A through-the-wall AC is installed directly into a wall sleeve that supports the unit's weight, providing a permanent and secure installation. These systems vent directly outside, preserving window usage and improving security.
Pros:
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Does not block your window.
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Quieter operation.
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More secure and sealed installation.
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Often higher energy efficiency.
Cons:
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Requires cutting a hole in the wall if one isn’t already present.
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Higher upfront installation cost.
Learn more about how through-the-wall ACs
🪟 What is a Window AC?
A window AC sits in your window frame, venting hot air outside while blowing cool air into your room.
Pros:
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Lower upfront cost.
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Easy DIY installation and removal.
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Portable between rooms (if manageable).
Cons:
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Blocks your window and natural light.
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Less secure; potential break-in risk.
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Typically noisier due to less insulation.
See this Energy Star guide to room air conditioners for detailed energy considerations for window units.
📐 Sizing and BTU Requirements for Small Spaces
Both systems require correct sizing to avoid inefficiencies and discomfort. Use the Energy Star AC sizing calculator to determine your BTU needs based on your room's:
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Square footage.
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Ceiling height.
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Sun exposure.
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Insulation quality.
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Occupancy and appliance load.
Example: A 400 sq ft room in a warm climate typically needs 9,000-10,000 BTUs, making the Amana 9,300 BTU through-the-wall AC ideal.
🪟 Space Utilization: Why It Matters
Through-the-Wall AC
✅ Preserves window space for natural light and ventilation. ✅ Enables window use for fire escape or emergency egress. ✅ Looks cleaner and integrated.
Window AC
❌ Occupies the entire window. ❌ Blocks natural light and ventilation. ❌ May require seasonal removal for full window usage.
For small apartments with limited windows, a through-the-wall AC preserves daylight, making your space feel larger and less claustrophobic.
🔇 Noise Levels: Which is Quieter?
Through-the-wall ACs are typically quieter due to better insulation around the unit and reduced vibration.
Window ACs can be noisier, especially in older models, as vibrations resonate through the window frame.
If noise is a concern for sleep or office focus, a through-the-wall AC is the better choice. Learn about noise ratings and decibel levels in Consumer Reports’ AC noise guide.
⚡ Energy Efficiency and Operating Costs
Through-the-wall ACs often have higher EER (Energy Efficiency Ratio) ratings than window units, reducing your monthly electricity costs.
Key factors:
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Proper Sizing: Prevents overcycling.
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Sealed Installation: Reduces air leaks.
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Programmable Timers & Thermostats: Helps manage runtime efficiently.
For details on how EER impacts your utility bills, visit the Federal Energy Management Program.
💸 Installation and Maintenance Costs
| Feature | Through-the-Wall AC | Window AC |
|---|---|---|
| Upfront Cost | Higher (unit + installation) | Lower |
| Installation | Professional recommended | DIY possible |
| Seasonal Removal | No | Often required |
| Maintenance Access | Easy filter cleaning | Easy but requires removal for deep cleaning |
While a through-the-wall AC has a higher initial cost, it may last longer and be more efficient in the long term.
🔐 Security and Safety
Through-the-wall ACs:
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Provide a more secure installation, reducing break-in risks.
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Are fixed in place, ensuring stability during storms or high winds.
Window ACs:
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Can be pushed or pulled out if not secured correctly.
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May require additional brackets or window locks for security.
For security concerns, a through-the-wall unit offers peace of mind, especially in ground-level apartments.
🧩 Aesthetic and Long-Term Impact on Property
Through-the-wall ACs: ✅ Blend into your wall for a clean look. ✅ Do not impact your view or window function. ✅ Add value for buyers seeking an integrated cooling solution.
Window ACs: ❌ Can look cluttered or temporary. ❌ Block your view. ❌ May need removal before property showings if selling or renting.
If aesthetics are a priority, the through-the-wall unit is the clear winner.
🧊 Performance in Different Climates
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In humid climates, a through-the-wall AC can help dehumidify more effectively due to its continuous seal and stable operation.
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In mild climates, a window AC may suffice seasonally if you only need occasional cooling.
For understanding dehumidification performance, review this EPA guide on indoor humidity.
📈 Case Study: Studio Apartment in Miami, FL
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Space: 450 sq ft studio.
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Climate: Hot and humid.
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Windows: One large window, limited daylight.
Through-the-Wall AC Benefits:
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Preserves the only window for daylight.
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Provides stable humidity control.
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Quiet operation for sleep.
Window AC Drawbacks:
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Blocks the only window, darkening the space.
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Higher humidity levels due to less stable operation.
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Noise could disrupt sleep.
Verdict: A through-the-wall AC would enhance comfort, efficiency, and livability in a small Miami studio.
🪛 Installation Considerations for Each Option
Through-the-Wall AC:
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Requires a properly sized wall sleeve (typically 24.5-27 inches).
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May require electrical upgrades (230/208V for units like the Amana PBC093J00AA).
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Best installed by a professional for warranty compliance.
Window AC:
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Easy to install in most sliding or double-hung windows.
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Requires secure brackets to prevent tipping or falling.
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Easy removal for off-season storage.
For a visual installation guide, see this through-the-wall AC installation video.
🛠️ Maintenance Comparison
Through-the-Wall AC:
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Slide-out chassis for easy cleaning.
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Filters easily accessible.
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Minimal seasonal maintenance beyond filter checks.
Window AC:
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Filters accessible but require removal for deep cleaning.
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May need seasonal removal to prevent drafts and water damage.
For maintaining your AC, follow Energy Star’s maintenance guide.
✅ Which Should You Choose?
| Factor | Through-the-Wall AC | Window AC |
| Space Use | Preserves window | Uses window |
| Noise | Quieter | Louder |
| Energy Efficiency | Higher | Lower |
| Security | Higher | Lower |
| Installation Cost | Higher | Lower |
| Maintenance | Easier long-term | Easier short-term |
| Mobility | Fixed | Portable |
🎯 Conclusion: Best for Small Spaces?
If you:
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Have limited windows and value daylight.
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Seek lower noise for sleep or work.
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Plan to live in your space long-term.
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Value aesthetics and energy efficiency.
➡️ Choose a through-the-wall AC.
If you:
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Want a low upfront cost.
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Need a temporary or portable solution.
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Live in a mild climate where AC use is occasional.
➡️ Choose a window AC.
For many small spaces, the Amana offers the perfect balance of efficiency, quiet operation, and comfort while preserving window use.
📌 Next Steps
✅ Measure your space and windows.
✅ Assess your climate and insulation.
✅ Review your budget and installation options.
✅ Explore the Through-the-Wall AC collection.
✅ Contact The Furnace Outlet for help choosing the right size.
By using this guide, you’ll confidently select the best cooling solution for your small space, ensuring a comfortable, energy-efficient summer.
In the next topic we will know more about: How to Install a Through-the-Wall AC Without Headaches: Step-by-Step
