Out of window air conditioners offer a practical cooling solution that maximizes window space while providing efficient temperature control. Unlike traditional window units that block a significant portion of your window, these systems are designed with most of the unit sitting outside the window frame. This innovative configuration preserves natural light and views while still delivering powerful cooling performance. Out of window models come in various configurations, including those with minimal indoor components, saddle-style units, and through-the-wall variations. These systems have gained popularity among apartment dwellers, renters, and homeowners seeking effective cooling without major structural modifications or sacrificing window functionality.
Out of window air conditioners are cooling units specifically designed to have the majority of their components positioned outside the window. Unlike traditional window units that take up significant window real estate, these systems minimize interior obstruction while maximizing cooling efficiency.
The typical design includes a smaller indoor section containing controls and air vents, with the larger portion (housing the compressor and condenser) sitting outside. This configuration helps reduce indoor noise levels since the loudest components remain outside. Most models require only a standard single or double-hung window for installation, making them versatile for various home styles.
These units are particularly beneficial for those who want to maintain window functionality, preserve views, or deal with unusual window configurations. They represent an evolution in window air conditioner design that addresses common complaints about traditional units.
Types of Out Of Window Air Conditioners
Low-Profile Window Units
Low-profile window air conditioners feature a slimmer indoor profile with the bulkier components positioned outside. These units protrude less into the room and often allow for partial window operation even when installed. They typically range from 5,000 to 12,000 BTU, making them suitable for small to medium-sized rooms.
Saddle Air Conditioners
Saddle-style units are innovative designs that sit on the windowsill like a saddle on a horse. The majority of the unit hangs outside while a slim control panel remains inside. These are particularly popular in urban apartments where window space is at a premium. Brands like Midea and Windmill have pioneered these space-saving designs.
Through-the-Wall Models
While not technically window units, through-the-wall air conditioners follow similar principles by placing most of the system outside. These require permanent installation in an exterior wall but free up window space entirely. They’re ideal for rooms without suitable windows or where preserving all window functionality is essential.
Casement Window Units
Specially designed for vertical sliding or casement windows, these units adapt the out-of-window concept for non-traditional window styles. They feature vertical configurations that accommodate windows that open sideways rather than up and down.
Benefits of Out Of Window Air Conditioners
Preservation of Window Space and Light
One of the primary advantages of out of window air conditioners is the minimal obstruction of natural light. By positioning the bulk of the unit outside, these systems allow more sunlight to enter compared to traditional window units. This design also maintains better views to the outdoors and, in some models, allows for partial window operation even with the unit installed.
Noise Reduction
Out of window air conditioners typically offer superior noise management compared to standard window units. Since the compressor and fan—the noisiest components—are positioned outside, indoor noise levels are notably reduced. Many models generate indoor noise levels as low as 40-45 decibels, comparable to a quiet library environment.
Energy Efficiency
Modern out of window units often feature enhanced energy efficiency ratings. Many models come with Energy Star certification, programmable timers, and eco-modes that can reduce electricity consumption by 15-30% compared to older window units. The external positioning also helps with heat dissipation, allowing for more efficient operation.
Ease of Installation
Most out of window air conditioners are designed for DIY installation without specialized tools. They typically include adjustable window brackets, weatherstripping materials, and detailed instructions. The external weight distribution often makes these units easier to install than traditional window ACs that need to be fully supported from the inside.
Installation Process
Installing an out of window air conditioner typically follows these key steps, though specific instructions may vary by model:
- Preparation: Measure your window opening to ensure compatibility with your unit.
- Assembly: Attach any included mounting brackets or accessories to the unit.
- Positioning: Place the unit on the windowsill with the majority extending outside.
- Securing: Extend side panels and use the locking mechanism to secure the unit in place.
- Sealing: Apply weather stripping and foam insulation to create an airtight seal.
- Support: If required, install any external support brackets to bear the weight of the protruding portion.
- Final checks: Ensure the unit is level and securely installed before operation.
Most manufacturers recommend avoiding extension cords and connecting the unit directly to a grounded outlet with appropriate amperage. For heavier units, you might need an assistant to help position the air conditioner safely during installation.
Maintenance Tips
Proper maintenance ensures optimal performance and extends the lifespan of your out of window air conditioner:
- Filter cleaning: Wash or replace air filters every 2-4 weeks during heavy use periods.
- Coil maintenance: Clean the evaporator and condenser coils annually using a soft brush and specialized coil cleaner.
- Drainage check: Ensure condensate drain channels are unobstructed to prevent water damage.
- Fin straightening: Gently straighten bent cooling fins using a fin comb to maintain airflow efficiency.
- Seasonal storage: If removing the unit seasonally, clean thoroughly and store in an upright position in a dry location.
- Seal inspection: Check and replace weather stripping and insulation as needed to maintain energy efficiency.
Most manufacturers also recommend a professional inspection every 2-3 years to check refrigerant levels and electrical components that aren’t accessible to homeowners.
Comparison with Other Air Conditioning Solutions
| Feature | Out of Window AC | Traditional Window AC | Portable AC | Split System |
|---|---|---|---|---|
| Window Obstruction | Minimal | Significant | Partial (exhaust hose) | None |
| Installation Complexity | Moderate | Moderate | Easy | Complex (professional required) |
| Noise Level (Indoor) | Low-Moderate | Moderate-High | High | Very Low |
| Energy Efficiency | Good | Good | Fair | Excellent |
| Portability | Limited | Limited | High | None |
| Cooling Power | Good | Good | Fair | Excellent |
| Permanent Installation | Semi-permanent | Semi-permanent | No | Yes |
Out of window air conditioners strike a balance between performance and convenience. While they don’t offer the seamless aesthetics of split systems or the portability of portable units, they provide effective cooling with better window preservation than traditional window units.
For renters or those with restrictions on permanent modifications, out of window units offer a compelling compromise that provides efficient cooling without significant architectural changes to the dwelling.
Cost Analysis and Energy Efficiency
Initial Purchase Costs
| Type | BTU Range | Average Price Range | Suitable Room Size |
|---|---|---|---|
| Budget Models | 5,000-8,000 BTU | $150-$300 | 100-350 sq. ft. |
| Mid-Range Models | 8,000-12,000 BTU | $300-$500 | 350-550 sq. ft. |
| Premium Models | 12,000-18,000 BTU | $500-$800 | 550-1,000 sq. ft. |
| Smart/Connected Models | Various BTU options | $350-$900 | Depends on BTU |
When selecting a unit, matching BTU rating to room size is crucial for efficiency. An undersized unit will run continuously and struggle to cool, while an oversized unit will cycle too frequently, failing to properly dehumidify the space.
Operating Costs
Energy efficiency for air conditioners is primarily measured by Energy Efficiency Ratio (EER) and Combined Energy Efficiency Ratio (CEER). Higher ratings indicate greater efficiency and lower operating costs. Modern out of window units typically have CEER ratings between 10-12, with Energy Star models reaching 12+.
| Efficiency Rating | Estimated Monthly Cost (8h/day) | Annual Savings vs. Old Model |
|---|---|---|
| Standard (CEER 9-10) | $30-$45 | Baseline |
| Energy Star (CEER 11-12) | $24-$35 | $70-$120 |
| Premium Efficiency (CEER 13+) | $18-$30 | $140-$180 |
Additional features like programmable timers, eco modes, and smart controls can further reduce energy consumption by 15-30% by optimizing runtime and temperature settings.
Popular Models and Brands
Top-Rated Out Of Window Air Conditioners
| Model | BTU Rating | Special Features | Average Price | Energy Rating |
|---|---|---|---|---|
| Midea U Inverter | 8,000-12,000 | U-shaped design, allows window to open, WiFi enabled | $359-$549 | Energy Star, CEER 15 |
| Windmill AC | 8,300 | Low profile design, auto-dimming LED display, app control | $415 | Energy Star, CEER 11.4 |
| LG Dual Inverter | 9,500-22,000 | Variable speed compressor, low noise, WiFi control | $459-$749 | Energy Star, CEER 14.7 |
| Friedrich Chill Premier | 6,000-24,000 | QuietMaster technology, auto air sweep, timer | $359-$999 | Energy Star on select models |
| GE Profile | 8,000-18,000 | WiFi connected, voice control, quiet operation | $329-$589 | Energy Star, CEER 12.1 |
The Midea U Inverter has gained significant popularity for its innovative U-shaped design that allows the window to close through the middle of the unit. This configuration enables window operation even with the AC installed and provides superior noise isolation.
Newer brands like Windmill have focused on sleek aesthetics and smart functionality, appealing to younger consumers and those in modern apartments. Their units feature simplified installation procedures and contemporary designs that blend better with home decor.
Considerations Before Purchasing
Window Compatibility
Before purchasing, measure your window dimensions carefully. Most out of window units work with double-hung windows with minimum width requirements between 23-36 inches and minimum height requirements of 13-16 inches. Casement or sliding window models have different requirements and may need special mounting kits.
Electrical Requirements
Check your home’s electrical capacity. Most units under 10,000 BTU can operate on standard 115V circuits, but larger models may require 230V service. Confirm that your electrical panel can support the amperage draw of your chosen unit (typically 6-15 amps). Dedicated circuits are recommended for air conditioners to prevent overloading.
Noise Considerations
While out of window units are typically quieter inside than traditional window ACs, consider both indoor and outdoor noise. Indoor noise levels range from 40-60 decibels, while outdoor levels can reach 65-70 decibels. If you have close neighbors or noise ordinances, check the specific outdoor noise ratings and consider models with night modes or variable fan speeds.
Building and HOA Restrictions
Some apartments, condos, and HOAs have restrictions regarding window air conditioners. Check your lease or HOA guidelines before purchasing. Some prohibit visible external units or require professional installation. In historical districts, there may be additional regulations about external modifications to windows.
Warranty and Support
Warranty coverage varies significantly between brands, typically ranging from 1-5 years. Premium models often include longer warranties on sealed system components like the compressor. Consider brands with responsive customer service and readily available replacement parts when making your selection.