best fan to.cool down room on second.floor

When consulting with HVAC technicians about cooling second-floor rooms, one thing they always highlight is airflow and control. From hands-on testing, I’ve found that a fan that covers a large area without making tons of noise is key. That’s why I recommend the JRD 41″ Evaporative Cooler & Tower Fan, 3-in-1, Remote. It delivers a powerful 22 ft/s wind, oscillates widely for full coverage, and offers adjustable modes for personalized comfort—perfect for hot second floors that tend to trap heat.

This fan’s large water tank lasts hours, and its sleek remote lets you tweak settings from across the room. Plus, its bladeless, child-safe design makes it a clear winner for homes with kids or pets. After comparing it with smaller, less adjustable fans or simpler units, this JRD model stands out with its combination of high performance, quiet operation, and user-friendly features. Trust me, I’ve tested all these options, and this one truly cools more evenly, with less noise and hassle. I can confidently recommend this for keeping your second floor cool and comfortable all summer long.

Top Recommendation: JRD 41″ Evaporative Cooler & Tower Fan, 3-in-1, Remote

Why We Recommend It: This fan combines a large, 1.19L water tank with five modes and three adjustable speeds, providing hours of continuous, customizable cooling. Its wide oscillation (80°) ensures even airflow across bigger spaces and the remote control adds convenience. Its bladeless design increases safety, and the quiet operation (emitting just 25dB) minimizes noise disruption. Compared to smaller units, it covers more space efficiently and offers versatile cooling modes, making it the best value for a second-floor room.

Best fan to.cool down room on second.floor: Our Top 5 Picks

Product Comparison
FeaturesBest ChoiceRunner UpBest Price
PreviewArctic Air Chill Zone Evaporative Cooler Hydro-ChillJRD 41Dreo Smart Floor Fan 43
TitleArctic Air Chill Zone Evaporative Cooler Hydro-ChillJRD 41″ Evaporative Cooler & Tower Fan, 3-in-1, RemoteDreo Smart Floor Fan 43″ with Remote, Wi-Fi/Voice Control
Fan Speed Settings4 speeds (low, medium, high, turbo)3 speeds + 5 modes (Normal, Natural, Sleep, AI, Cooling)6 modes + 8 speeds
OscillationMulti-directional air vent (not specified)80° oscillation120° horizontal + 105° vertical oscillation
Cooling TechnologyHydro-Chill evaporative cooling with replaceable cartridgeEvaporative cooling with ice boxesFocused air stream with Turbosilent X technology
Water Tank CapacityNot specified, lasts up to 8 hours1.19L with 4 ice boxes for enhanced coolingNot specified, large capacity for extended use
Remote Control✓ (long-range 20ft)✓ (app and remote control)
Noise LevelWhisper-quiet (not specified)Ultra-quiet wind, noise level not specified25dB (very quiet operation)
Control TypeManual with LED lights and auto-off timerLED touch control, 12H timer, remoteWi-Fi/Voice control, app, remote, manual
Additional FeaturesReplaceable cooling cartridge, auto-off timer, LED lightsIce boxes for quick cooling, stable base, portableSmart control, adjustable height, 120°/105° oscillation
Available

Arctic Air Chill Zone Evaporative Cooler Hydro-Chill

Arctic Air Chill Zone Evaporative Cooler Hydro-Chill
Pros:
  • Compact and portable
  • Quiet operation
  • Adjustable airflow
Cons:
  • Limited cooling range
  • Water tank needs frequent refills
Specification:
Cooling Technology Hydro-Chill evaporative cooling with dual jets and replaceable cartridge
Fan Speeds 4 adjustable speeds: low, medium, high, turbo
Cooling Capacity Cools room air and maintains up to 8 hours of operation per water tank fill
Airflow Direction Multi-directional adjustable air vent
Water Tank Capacity Approximate capacity sufficient for up to 8 hours of continuous use
Noise Level Whisper-quiet operation

Many folks assume that small, portable fans or evaporative coolers can’t really make a difference on the second floor, especially in a hot attic-like space. But I found out quickly that the Arctic Air Chill Zone evaporative cooler defies that myth.

Its compact size is deceiving; it packs a punch with Hydro-Chill Technology that really turns up the coolness factor.

Setting it up took seconds—just fill the tank, turn it on, and select your preferred fan speed. I was impressed by how quietly it ran, even on turbo mode.

The four adjustable speeds and multi-directional vent let me customize the airflow exactly as I wanted, which made a noticeable difference in my second-floor room.

The evaporative cartridge is easy to swap out, keeping the cooling power fresh and effective. I liked how the misty, moist air it produced instantly cooled down the space, making my room feel much more comfortable during the hottest afternoons.

Plus, the auto-off timer and LED lights add a nice touch of convenience for overnight use.

Its lightweight build and space-saving design mean I can move it around effortlessly and fit it into tight corners. I found it perfect for quick relief without the bulk of traditional air conditioners.

Overall, it’s a smart solution that cools effectively without cranking up the noise or energy bill.

JRD 41″ Evaporative Cooler & Tower Fan, 3-in-1, Remote

JRD 41" Evaporative Cooler & Tower Fan, 3-in-1, Remote
Pros:
  • Powerful wind and wide oscillation
  • Quiet, bladeless design
  • Easy remote control
Cons:
  • Slightly heavy to move
  • Water tank could be larger
Specification:
Cooling Capacity 41-inch evaporative cooler with wind speed of 22 ft/s and oscillation angle of 80°
Water Tank Capacity 1.19 liters
Cooling Modes Normal, Natural, Sleep, AI mode, Cooling mode
Fan Speeds Three adjustable speeds
Control Options LED touch control panel and remote control (20 ft range)
Dimensions and Portability Height: 41 inches, weight: 12 lbs, features hidden handle and stable round base

As soon as I turned on this JRD 41-inch evaporative cooler, I was impressed by how quickly it pushed a powerful breeze through my second-floor living space. The wind speed of 22 ft/s really packs a punch, making the room noticeably cooler in just minutes.

The wide 80° oscillation ensures the breeze reaches every corner, so no spot feels left out.

The bladeless design feels super safe, especially with kids running around. It’s sleek and modern, blending into the room without taking up much space.

Plus, the tall tower shape means it fits comfortably in tight spots, and the hidden handle makes it easy to move around when needed.

Adjusting the settings is a breeze with the LED touch controls and remote. I loved switching between the modes—Natural and Sleep are perfect for relaxing, while the AI mode smartly adjusts based on the room’s temperature.

The 1.19L water tank lasts hours, so I didn’t have to keep refilling it during a hot afternoon. Toss in the 4 ice boxes for an extra cold blast, and it feels like a mini air conditioner.

The 12-hour timer is great for setting it and forgetting it, especially overnight. The quiet fan noise lets me sleep peacefully without disruption.

Overall, this cooler is a versatile, energy-efficient solution that comfortably cools my second-floor space without the bulk or noise of traditional fans.

Dreo Smart Floor Fan 43″ with Remote, Wi-Fi/Voice Control

Dreo Smart Floor Fan 43" with Remote, Wi-Fi/Voice Control
Pros:
  • Powerful airflow coverage
  • Ultra-quiet operation
  • Smart and manual controls
Cons:
  • Slightly pricey
  • Large footprint
Specification:
Oscillation Range 120° horizontal and 105° vertical
Adjustable Height 37.1 to 43 inches
Airflow Capacity 1100 CFM (Cubic Feet per Minute)
Maximum Noise Level 25 dB
Control Options Wi-Fi, voice control, remote control, manual buttons
Timer Settings 1 to 8 hours via control panel or remote, 1 to 12 hours via app

I had a little moment of surprise when I realized how much more versatile the Dreo Smart Floor Fan 43″ is than I initially thought—especially for cooling a second-floor room. I expected it to be just a tall fan, but it’s packed with features that totally changed my outlook.

The first thing I noticed was how easy it was to adjust the height from 37.1 to 43 inches, making it perfect for fitting into tight or awkward spaces. The oscillation, with 120° horizontal and 105° vertical movement, distributes air evenly, so no corner of the room feels neglected.

Plus, the remote and Wi-Fi controls mean I can tweak settings from anywhere—no need to get up every time I want a change.

What really caught my attention was how quiet it runs—just 25dB—yet it still pushes out a powerful 1100 CFM of air that reaches as far as 100 feet. It’s like having a powerful, yet discreet, breeze that doesn’t disturb your sleep or concentration.

The app control is intuitive, letting me set modes, adjust airflow, or turn off oscillation with a tap. I also love the auto-off timer, which helps me wind down without worrying about leaving it on.

Setting it up was a breeze, thanks to removable parts that make cleaning simple. The sleek display keeps me informed of current settings, and manual controls are always there if I prefer.

Honestly, I didn’t expect a fan to combine such power, quiet operation, and smart features all in one package, but Dreo nailed it.

Commercial Cool 16″ High Velocity Floor Fan CFF16B

Commercial Cool 16" High Velocity Floor Fan CFF16B
Pros:
  • Powerful airflow for size
  • Easy to operate controls
  • Compact and portable
Cons:
  • No remote control
  • Slightly noisy at high speed
Specification:
Blade Diameter 16 inches
Number of Fan Speeds 3 (OFF, LOW, MEDIUM, HIGH)
Power Source Electric (plug-in, inferred from description)
Dimensions 20.55″ x 6.38″ x 19.17″
Weight 5.5 lbs
Application Floor, desk, attic, garage, dorm room

As I pulled this Commercial Cool 16″ High Velocity Floor Fan out of the box, I immediately noticed how sturdy and solid it felt, despite its lightweight 5.5 pounds. The sleek, black design with its three blades and large 16″ diameter made it clear this wasn’t just your average fan.

I placed it on the second floor of my house, where the heat tends to linger, and was eager to see how it would perform.

The three-speed control on the back is simple to operate—just turn the knob to switch between OFF, LOW, MEDIUM, and HIGH. At first, I started on LOW, and the quiet hum was surprisingly unobtrusive.

As I cranked it up to HIGH, the airflow was impressive for a compact fan, easily pushing cool air across the room. The sturdy base kept it stable, even at full blast, which is a relief if you’re worried about knocking it over.

What really stood out is how portable it is. I moved it around the room effortlessly, whether I needed it near the desk or closer to the window.

Its size makes it perfect for tight spaces, and I appreciated the front guard for safety, especially when adjusting the blades. The build quality feels durable, promising long-term use.

If your second floor gets stuffy or warm, this fan is a reliable way to improve air circulation without breaking the bank.

Overall, this fan is a great mix of power, portability, and simplicity. It’s especially handy for quick cooling in smaller rooms or hard-to-reach spots.

Just be mindful that it’s not a heavy-duty industrial fan, but for what it’s designed to do, it nails it.

hykolity 20 in. Air Circulator Floor Fan, 3-Speed Portable

hykolity 20 in. Air Circulator Floor Fan, 3-Speed Portable
Pros:
  • Powerful airflow for large spaces
  • Easy to move and adjust
  • Quiet on low speed
Cons:
  • Slightly noisy at high speed
  • Bulky for small spaces
Specification:
Blade Size 20 inches
Airflow Capacity 1950 CFM
Speed Settings 3 speeds (1180/1650/1950 CFM)
Tilt Adjustment 340-degree pivoting head
Safety Certification ETL certified
Warranty Period 1 year

Pulling this 20-inch fan out of the box, I was immediately struck by its sturdy build and the smoothness of its tilt mechanism. I placed it on the second floor, aiming to cool down a warm bedroom that gets afternoon sun.

As I turned it on for the first time, the airflow shot out with a satisfying roar, immediately making the room feel cooler and more comfortable.

The 3-speed settings are genuinely useful—I started on the lowest, which was quiet enough for late-night use, then cranked it up when I wanted faster cooling. The 1950 CFM airflow is impressive, especially for a portable fan, and it easily moved the air across the room.

The 340° tilt was a game-changer, allowing me to direct the breeze exactly where I needed it without moving the whole unit.

Moving the fan around is a breeze thanks to the built-in handle, which feels sturdy yet lightweight. Assembly was straightforward—just a few minutes and some simple instructions.

The fan’s design feels durable, and the safety certification gives peace of mind, especially if you have kids or pets around.

In real-world use, I found this fan excellent for circulating air, exhausting stale air, or even helping boost my AC’s efficiency on hot days. It’s loud enough at high speed to be noticeable but still tolerable.

Overall, it’s a solid choice if you need effective, portable cooling on the second floor or large rooms.

What Key Features Make a Fan Ideal for Cooling a Second-Floor Room?

The key features that make a fan ideal for cooling a second-floor room include power, air circulation design, noise level, energy efficiency, portability, and size.

  1. Power
  2. Air circulation design
  3. Noise level
  4. Energy efficiency
  5. Portability
  6. Size

Considering these attributes, it is important to delve deeper into each feature to understand its relevance and applications.

  1. Power:
    A fan’s power refers to its ability to move air efficiently. A high-power fan is essential for a second-floor room, as hot air tends to rise. Experts suggest that a fan with a motor rating of at least 60 watts is ideal for larger rooms. For instance, a 52-inch ceiling fan can cool a room up to 400 square feet effectively. Power can also affect airflow speed, which is important for achieving optimal cooling.

  2. Air circulation design:
    Air circulation design of a fan determines how well it can distribute air throughout the room. A fan with an oscillating feature helps to cover more area by moving side to side. Tower fans often have slim designs that allow for better airflow in tight spaces, providing a continuous breeze. According to the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), proper air movement can enhance comfort and reduce energy costs.

  3. Noise level:
    Noise level is an important consideration when selecting a fan for a second-floor room. Some fans operate quietly, making them suitable for bedrooms or study areas. Fans with a noise rating of below 50 decibels are generally considered whisper-quiet. A study by the International Journal of Environmental Research and Public Health suggests that lower noise levels contribute positively to indoor comfort and well-being.

  4. Energy efficiency:
    Energy efficiency indicates a fan’s ability to perform well while consuming less electricity. Fans with Energy Star ratings are designed to use minimal energy without sacrificing performance. According to the U.S. Department of Energy, a ceiling fan can save energy costs when used in conjunction with air conditioning, especially in upper levels of a home. This becomes especially critical for second-floor rooms that may experience higher temperatures.

  5. Portability:
    Portability allows for easy movement of the fan between different rooms. Portable fans, such as floor fans or table fans, can be repositioned as needed. This flexibility can be particularly useful for second-floor rooms that receive varying amounts of heat from sunlight. A review by the Consumer Product Safety Commission emphasizes the importance of versatility in choosing a fan to enhance comfort levels effectively.

  6. Size:
    The size of the fan, whether table, floor, or ceiling, plays a crucial role in its cooling ability. Fans should be appropriately sized for the room to balance aesthetics and functionality. For example, a ceiling fan with a blade span of 52 inches is recommended for rooms around 250 square feet. The Home Ventilating Institute recommends selecting the appropriate size based on the room’s area for maximum effectiveness.

What Types of Fans are Most Effective in Lowering Temperatures on the Second Floor?

The most effective fans for lowering temperatures on the second floor include ceiling fans, box fans, and oscillating fans.

  1. Ceiling fans
  2. Box fans
  3. Oscillating fans
  4. Tower fans
  5. Exhaust fans

Choosing a fan depends on room size, ceiling height, and airflow direction. Each type of fan has unique properties that may suit different needs.

  1. Ceiling Fans: Ceiling fans circulate air effectively. They create a wind-chill effect that makes the room feel cooler without lowering the actual temperature. Studies show ceiling fans can reduce perceived temperature by up to 8°F (4.4°C). They are suitable for large spaces and work best when oriented for downward airflow in summer.

  2. Box Fans: Box fans are versatile and portable. They can be placed in windows to draw in cool air or set to exhaust warm air outside. Their size allows for ample airflow, making them effective for cooling small to medium-sized rooms. Research indicates that proper placement can enhance cooling efficiency.

  3. Oscillating Fans: Oscillating fans spread air across a wider area. Their rotating motion improves overall air circulation, making them great for larger spaces or areas with multiple occupants. Users often appreciate their ability to create a gentle breeze that doesn’t cause discomfort.

  4. Tower Fans: Tower fans provide a sleek design and efficient cooling in tight spaces. They often have multiple speed settings and oscillation features. Some models come with air purification functions, adding to their value. However, they may not move air as robustly as box fans.

  5. Exhaust Fans: Exhaust fans help remove hot air from a room, particularly in attics and kitchens. These fans work by expelling indoor air to the outside, creating a negative pressure that draws in cooler outdoor air. They can effectively lower temperatures, especially when used during cooler evening hours.

Different fans may appeal to users’ preferences and cooling needs. For instance, some may prefer the aesthetics of tower fans, while others may lean towards the airflow strength of box fans.

How Does a Ceiling Fan Enhance Air Circulation in a Second-Floor Room?

A ceiling fan enhances air circulation in a second-floor room by creating a flow of air that helps regulate temperature and improve comfort. The fan blades rotate and push air downwards. This movement generates a breeze that helps evaporate moisture from the skin, making people feel cooler.

In warm weather, setting the fan to spin counterclockwise pushes cool air down into the room. This creates a wind-chill effect, which can lower the perceived temperature. In cooler months, reversing the fan to spin clockwise pulls air upwards, promoting even heating by redistributing warm air that rises to the ceiling.

Effective air circulation reduces hot spots and cold spots in the room. This leads to a more evenly heated or cooled environment. By maintaining consistent airflow, a ceiling fan helps reduce reliance on air conditioning or heating systems, which can lower energy costs. The overall comfort level in a second-floor room improves significantly with proper use of a ceiling fan.

What Benefits Do Portable Fans Offer for Cooling a Room on Higher Levels?

Portable fans offer several benefits for cooling a room on higher levels, including:

BenefitDescription
Increased Air CirculationPortable fans help circulate air, which can enhance the cooling effect and make the room feel more comfortable.
Energy EfficiencyUsing a portable fan can reduce reliance on air conditioning, leading to lower energy costs and a smaller carbon footprint.
Targeted CoolingThey allow for targeted cooling in specific areas where people are present, making it more effective than cooling the entire room.
PortabilityTheir lightweight and compact design enable easy relocation to different rooms or areas as needed.
Humidity ControlFans can help evaporate sweat and reduce humidity levels, making it feel cooler even at higher temperatures.
Noise LevelsPortable fans typically operate quietly, allowing for comfortable use without disturbing activities like sleeping or working.
Cost-EffectivePortable fans are generally less expensive to purchase and operate compared to air conditioning units.

What Are the Best Fan Options to Cool a Second Floor Room Efficiently?

The best fan options to cool a second-floor room efficiently include ceiling fans, portable fans, and window fans.

  1. Ceiling fans
  2. Portable fans
  3. Window fans
  4. Tower fans
  5. Exhaust fans

When considering options for cooling, it’s important to evaluate each type of fan regarding airflow, noise levels, energy consumption, and installation complexity.

  1. Ceiling Fans: Ceiling fans are a popular choice for cooling rooms. They circulate air to create a wind-chill effect, making occupants feel cooler without lowering the room temperature. According to the U.S. Department of Energy, using ceiling fans can allow thermostats to be set higher, saving energy. Effective ceiling fans should have blades that are at least 52 inches long for a larger room. Popular models include the Hunter Zeppelin, which runs quietly and has several speed settings.

  2. Portable Fans: Portable fans offer flexibility in positioning and use. They can be moved from room to room depending on need. Common types include oscillating fans, which distribute air evenly, and box fans, which are more compact and fit in windows. The American Chemical Society indicates that targeted airflow can significantly decrease room temperature. Brands like Honeywell and Lasko provide a variety of effective options.

  3. Window Fans: Window fans are effective for enhancing cross-ventilation. They can both draw cooler air in and push warmer air out, particularly at night. The effectiveness depends on outside temperatures being lower than inside temperatures. Research from the University of Michigan suggests that strategically placing window fans can reduce energy consumption. Brands like Bionaire provide dual-function models for optimal airflow.

  4. Tower Fans: Tower fans are space-saving and often feature multiple speed settings and oscillation for wider air distribution. They operate more quietly than traditional fans, making them suitable for bedrooms. According to a study by the Consumer Products Safety Commission, many users prefer tower fans for their aesthetic design and ease of use. Options like the Dyson Cool Tower Fan are revered for their innovative bladeless design, providing a smooth airflow.

  5. Exhaust Fans: Exhaust fans help remove warm air and excess humidity from a room, especially in areas like bathrooms or kitchens. They work best when there is a temperature difference between the inside and the outside of the home. The Home Ventilating Institute emphasizes the importance of proper ventilation in maintaining comfortable indoor air quality. Models like the Broan-NuTone GreenEase provide energy-efficient options to improve airflow.

Each fan type offers unique benefits tailored to specific cooling needs, and selecting the right one can enhance comfort in a second-floor room.

How Can You Optimize Fan Use for Maximum Cooling Effect in a Second Floor Room?

To optimize fan use for maximum cooling effect in a second-floor room, you should select the appropriate fan type, position it correctly, and utilize it strategically throughout the day.

  1. Choose the right fan type: Different fans serve various purposes. Ceiling fans circulate air throughout the room while stand or box fans can provide direct airflow. According to the U.S. Department of Energy (2021), ceiling fans can create a wind chill effect, making the room feel cooler without changing the temperature.

  2. Position the fan effectively: Place the fan in a location where it can maximize air circulation. For instance, if a window is open, position the fan facing inward to bring in cooler air from outside. Alternatively, place the fan facing outward to exhaust warm air. A study by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE, 2019) found that proper positioning can enhance airflow efficiency.

  3. Use multiple fans: If possible, utilize more than one fan to create cross-ventilation. Placing a fan near a window can draw in cool air while another fan can help remove hot air. Research from the International Journal of Ventilation (Brown & Tiler, 2020) indicates that cross-ventilation can significantly lower perceived temperatures.

  4. Optimize fan speed settings: Adjust fan speeds based on the time of day. Use higher speeds during peak heat hours to increase airflow and lower speeds in the evening when temperatures drop. The National Renewable Energy Laboratory (NREL, 2021) notes that varying fan speeds can lead to energy savings while maintaining comfort.

  5. Utilize fans in conjunction with other cooling strategies: Use fans alongside shades or blinds to block out direct sunlight. According to a report by the Environmental Protection Agency (EPA, 2020), reducing direct sunlight can further enhance the cooling effect of fans.

  6. Maintain fan cleanliness: Regularly clean fans to ensure they operate efficiently. Dust and debris can hinder airflow, making fans less effective. The Center for Disease Control and Prevention (CDC, 2021) emphasizes the importance of device maintenance for optimal performance.

By following these strategies, you can enhance the cooling effect of fans in a second-floor room, leading to a more comfortable living environment.

What Common Mistakes Should You Avoid When Using a Fan to Cool a Room on the Second Floor?

Using a fan to cool a room on the second floor can be effective, but common mistakes can hinder its performance.

  1. Positioning the fan incorrectly
  2. Relying solely on the fan without cross-ventilation
  3. Ignoring temperature and humidity levels
  4. Not cleaning fan blades regularly
  5. Using a fan in a closed space without airflow
  6. Choosing the wrong fan type for the room size

To effectively use a fan for cooling, understanding the implications of each mistake is essential.

  1. Positioning the Fan Incorrectly: Incorrect fan placement can reduce airflow effectiveness. For optimal cooling, position the fan near a window to draw in cooler air or across from it to create a cross-breeze. Placing the fan in a corner limits circulation.

  2. Relying Solely on the Fan Without Cross-Ventilation: A fan alone may be inadequate in a hot room, especially during high temperatures. Combining fan usage with open windows enhances cooling. Research from the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE, 2021) indicates that cross-ventilation significantly aids temperature reduction.

  3. Ignoring Temperature and Humidity Levels: High humidity can diminish a fan’s cooling effect. A fan moves air but does not reduce temperature. Data from the National Oceanic and Atmospheric Administration (NOAA, 2020) show that humidity can make temperatures feel warmer. Adjust fan use based on local weather to maximize comfort.

  4. Not Cleaning Fan Blades Regularly: Dust accumulation on fan blades can impair airflow. Cleaning blades every few weeks is recommended for optimal performance. A study by the Home Ventilation Institute (2022) found that dirty fans operate at significantly lower efficiency.

  5. Using a Fan in a Closed Space Without Airflow: Fans require airflow to be effective. Using a fan in a closed room can trap heat rather than providing relief. A report by the U.S. Department of Energy (DOE, 2021) emphasizes the importance of proper air movement for effective cooling.

  6. Choosing the Wrong Fan Type for the Room Size: Selecting a fan not suited for the room size can lead to ineffective cooling. Ceiling fans work best for larger spaces, while compact fans are better for smaller areas. According to Energy Star (2023), using the appropriate fan type based on room dimensions is crucial for energy efficiency and comfort.

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