Side to side window air conditioners, also known as casement or sliding window AC units, are specially designed for windows that open horizontally rather than vertically. These specialized units provide cooling solutions for homes with architectural constraints that make traditional window units impractical. Unlike standard window air conditioners that extend outward from the window, these models are typically taller and narrower to accommodate the unique dimensions of sliding windows. Their growing popularity stems from their ability to efficiently cool spaces while working with window types that previously limited cooling options.
Understanding Side To Side Window Air Conditioners
Side to side window air conditioners are specifically engineered for windows that slide horizontally, including casement windows that open outward like a door. These units differ significantly in design from standard window air conditioners, which are built for double-hung windows that move up and down.
The typical dimensions of a side to side AC unit range from 14-15 inches wide, 20-24 inches tall, and 18-21 inches deep. This vertical orientation allows them to fit properly in sliding windows without excessive protrusion or installation difficulties. Most models offer cooling capacities between 8,000 and 12,000 BTU, making them suitable for rooms between 300 and 550 square feet.
Key Features and Components
Modern side to side window air conditioners come equipped with several essential components and features:
- Vertical design optimized for horizontal window openings
- Specialized mounting brackets and extender panels to secure the unit
- Digital controls with programmable settings and remote operation
- Multi-directional airflow vents for optimal air distribution
- Washable filters for easier maintenance
- Variable fan speeds and cooling modes
- Energy-saving features including programmable timers and sleep modes
Benefits of Side To Side Window Air Conditioners
The primary advantage of these specialized units is their compatibility with window types that traditional air conditioners cannot accommodate. Homeowners with casement, sliding, or crank-out windows no longer need to resort to portable units with inefficient exhaust hoses or expensive central air installations.
These units also offer comparable energy efficiency to standard window models. Most modern side to side air conditioners come with Energy Star certification, indicating they meet or exceed federal guidelines for energy consumption. This translates to lower utility bills compared to portable air conditioners, which typically consume more electricity for equivalent cooling output.
Installation flexibility represents another benefit. Many models include adjustable panels and brackets that can accommodate various window widths. This versatility means that even non-standard window dimensions can often be fitted with an appropriate unit without extensive modifications.
Top Side To Side Window Air Conditioner Models
The market offers several high-quality side to side window air conditioners with varying features and specifications. The following comparison highlights some of the most popular models available to American consumers:
| Model | BTU Rating | Room Size (sq ft) | Energy Efficiency (EER) | Key Features | Average Price |
|---|---|---|---|---|---|
| Frigidaire FFRS0822SE | 8,000 | 350 | 11.3 | Remote control, programmable timer, sleep mode | $399-$449 |
| Koldfront CAC8000W | 8,000 | 350 | 10.7 | 4-way air direction, energy saver function | $329-$379 |
| Perfect Aire 3PASC10000 | 10,000 | 450 | 11.0 | Digital display, remote, 24-hour timer | $429-$479 |
| Haier ESAQ406T | 6,000 | 250 | 12.2 | Ultra-quiet operation, 4 operating modes | $299-$349 |
| LG LW1019IVSM | 9,500 | 400 | 14.7 | Dual inverter technology, Wi-Fi connectivity | $479-$529 |
Premium Features Worth Considering
When selecting a side to side window air conditioner, several premium features can enhance comfort and convenience:
- Inverter technology – Provides more precise temperature control and operates more quietly
- Smart connectivity – Allows control via smartphone apps and integration with home automation systems
- Dehumidification mode – Removes excess humidity without significant cooling
- Auto-restart function – Automatically resumes operation after power outages
- Programmable 24-hour timers – Enable customized cooling schedules
- Reusable antimicrobial filters – Reduce airborne contaminants and maintenance frequency
Installation Guide For Side To Side Window Air Conditioners
Installing a side to side window air conditioner requires careful preparation and attention to detail. The process differs significantly from standard window unit installation due to the vertical orientation and specialized mounting requirements.
Pre-Installation Preparation
Before beginning installation, gather these essential tools and materials:
- Measuring tape
- Screwdriver (Phillips and flathead)
- Level
- Drill with appropriate bits
- Weather stripping
- Foam insulation strips
- Support brackets (if not included with the unit)
- Assistant to help with lifting and positioning
Begin by measuring your window opening carefully. Ensure the unit you’ve purchased will fit properly, allowing for the necessary clearance on all sides. Most manufacturers recommend at least 1/2 inch clearance beyond the unit dimensions.
Step-by-Step Installation Process
Follow these steps for a successful installation:
- Remove the air conditioner from its packaging and check that all components are included
- Open the window fully and clean the window frame and sill thoroughly
- Attach any required mounting brackets to the window frame according to manufacturer instructions
- Apply weather stripping to the window frame to create a proper seal
- With assistance, carefully lift the unit and position it in the window opening
- Extend the side panels to fill any gaps between the unit and window frame
- Secure the unit to the mounting brackets using the provided hardware
- Close the window against the top of the air conditioner and secure it in place
- Seal any remaining gaps with foam insulation strips
- Ensure the unit is level and tilted slightly downward toward the exterior (approximately 1/4 inch) to allow proper condensation drainage
Maintenance Tips For Side To Side Units
Regular maintenance ensures optimal performance and extends the lifespan of your side to side window air conditioner. Establishing a consistent maintenance schedule helps prevent costly repairs and efficiency losses.
Routine Maintenance Tasks
Perform these maintenance tasks regularly:
- Clean or replace the air filter every 2-4 weeks during heavy use seasons
- Inspect and clean the evaporator and condenser coils at least twice per cooling season
- Check and straighten any bent cooling fins using a fin comb tool
- Clear the condensate drain to prevent water buildup and potential damage
- Clean the exterior housing with mild soap and water
- Inspect seals and weather stripping, replacing as needed
- Cover the exterior portion of the unit during off-seasons if it remains installed year-round
When cleaning the unit, always disconnect the power first. Use a vacuum with a soft brush attachment to remove dust and debris from accessible components without damaging the delicate parts.
Seasonal Maintenance Considerations
At the beginning of each cooling season:
- Remove any protective covering from the exterior portion
- Check all electrical connections for corrosion or damage
- Test all operating modes and settings
- Verify that the thermostat is functioning accurately
- Ensure proper drainage by pouring a small amount of water into the condensate pan
At the end of the cooling season, either remove and store the unit or cover the exterior portion with a weatherproof air conditioner cover designed for side to side models.
Energy Efficiency Considerations
Energy efficiency is a crucial factor when selecting and operating a side to side window air conditioner. Understanding efficiency ratings and implementing energy-saving practices can significantly reduce operating costs while maintaining comfort.
Understanding Efficiency Ratings
The primary efficiency metric for window air conditioners is the Energy Efficiency Ratio (EER), which measures the ratio of cooling output to energy input. Modern side to side units typically have EER ratings between 10 and 15, with higher numbers indicating greater efficiency.
| EER Rating | Efficiency Level | Estimated Annual Energy Cost* |
|---|---|---|
| 9.0-10.9 | Good | $70-$90 |
| 11.0-12.9 | Very Good | $55-$70 |
| 13.0+ | Excellent | $40-$55 |
*Based on 1,000 hours of operation at average U.S. electricity rates for a 10,000 BTU unit
Energy-Saving Operation Tips
Maximize energy efficiency with these practical strategies:
- Set the thermostat to 78°F (26°C) or higher when at home and 85°F (29°C) when away
- Use the programmable timer to reduce cooling when the space is unoccupied
- Close blinds or curtains during peak sunlight hours to reduce solar heat gain
- Use ceiling fans in conjunction with the air conditioner to improve air circulation
- Enable energy-saving or eco modes when available on your unit
- Ensure proper insulation around the unit to prevent cool air leakage
- Position the unit away from heat-generating appliances and direct sunlight
Common Issues and Troubleshooting
Side to side window air conditioners may occasionally experience operational problems. Many common issues can be resolved without professional service by following these troubleshooting steps.
Unit Not Cooling Properly
If your air conditioner is running but not cooling effectively:
- Check for dirty or clogged air filters and clean or replace as needed
- Ensure the thermostat is set correctly and functioning properly
- Verify that the unit size is appropriate for the room dimensions
- Check for obstructions around the exterior portion of the unit
- Inspect the evaporator coils for ice buildup; if present, turn off the unit and allow it to defrost
Excessive Noise
Unusual or excessive noise may indicate:
- Loose parts or mounting hardware requiring tightening
- Debris in the fan or blower assembly
- Improperly leveled installation causing vibration
- Worn bearings or motor issues requiring professional service
Water Leakage
Water dripping from the interior portion of the unit may result from:
- Improper installation angle (unit should tilt slightly toward the exterior)
- Clogged condensate drain requiring cleaning
- Damaged or missing drain pan
- Excessive humidity in the room
Comparing Side To Side vs. Standard Window Air Conditioners
Understanding the key differences between side to side and standard window air conditioners helps consumers make informed purchasing decisions. Each type has distinct advantages depending on window configuration, room layout, and cooling needs.
| Feature | Side to Side Units | Standard Window Units |
|---|---|---|
| Compatible Window Types | Casement, sliding, crank-out | Double-hung, single-hung |
| Typical Dimensions | Taller, narrower profile (15″W x 22″H x 20″D) | Wider, shorter profile (24″W x 14″H x 20″D) |
| Installation Complexity | Moderate to complex, often requires brackets | Simpler, often requires minimal hardware |
| Average Cost | $350-$550 | $250-$450 |
| Market Availability | Fewer options, specialized retailers | Widely available, numerous options |
| Energy Efficiency | Comparable (10-15 EER) | Comparable (10-15 EER) |
| Noise Level | Generally similar | Generally similar |
Which Type Is Right For Your Home?
The decision between side to side and standard window air conditioners primarily depends on your window configuration:
- Choose a side to side unit if you have:
- Casement windows that open outward
- Horizontal sliding windows
- Narrow window openings that cannot accommodate standard units
- Choose a standard window unit if you have:
- Double-hung windows that slide vertically
- Budget constraints (standard units typically cost less)
- Need for greater variety in BTU options and features
In terms of cooling performance, both types offer similar efficiency when properly sized for the space. The primary consideration should be compatibility with your existing window configuration, followed by features, noise level, and energy efficiency ratings.