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Best Ac Units Energy Efficiency (2024 Update)

If you’re looking for the best AC units with energy efficiency, there are important factors to consider before making a purchase. The first is the size of the unit, as it should be the right size for the space you intend to cool. A unit that is too small will not cool the space efficiently, while one that is too large will consume excess energy. The second is the SEER rating, which stands for Seasonal Energy Efficiency Ratio, and is a measure of how efficiently the unit uses power over time. Units with higher SEER ratings consume less energy and are more energy-efficient. Other factors such as noise level, filter type, and warranty should also be considered.

Are you tired of paying hefty electricity bills during summer months when your AC unit is constantly running? Do you want to make sure that your next AC unit purchase is one of the most energy-efficient ones in the market? Are you looking for an AC unit that can maintain a comfortable temperature in your home without breaking the bank? Look no further, as this article explores the best AC units with energy efficiency.

Did you know that the size of your AC unit plays a significant role in its energy consumption? Additionally, AC units with higher SEER ratings use less energy and work more efficiently. But with so many options in the market, finding the one that matches your needs can be a daunting task. This article provides some insights to help you make an informed decision on what to look for before buying your next AC unit.

10 Best Ac Units Energy Efficiency

# Product Image Product Name Product Notes Check Price
1
This product is ideal for cooling small spaces up to 350 square feet with energy-saving features and remote control accessibility.
2
Ideal for cooling medium-sized rooms with features like Wi-Fi connectivity, energy-efficient cooling, and remote/smartphone control.
3
This product is ideal for cooling small areas of up to 250 square feet efficiently using a remote control.
4
This product is ideal for cooling small rooms up to 150 square feet with mechanical controls and energy-saving features.
5
Ideal for cooling, dehumidifying, and air circulation in single-room spaces with remote control convenience and energy efficiency.
6
Ideal for cooling medium-sized rooms efficiently, with WiFi connectivity and an easy-to-install full window view design.
7
This product is ideal for cooling, circulating, and dehumidifying small spaces up to 250 square feet.
8
The product is ideal for home air conditioning that is easy to install, energy-efficient, quiet, and smart-home enabled.
9
This product is ideal for cooling small rooms, with easy installation and energy-efficient features, perfect for those looking to save money.
10
This product is ideal for cooling small to medium sized rooms up to 340 square feet with a washable filter and remote control.
This product is ideal for cooling small spaces up to 350 square feet with energy-saving features and remote control accessibility.
Ideal for cooling medium-sized rooms with features like Wi-Fi connectivity, energy-efficient cooling, and remote/smartphone control.
This product is ideal for cooling small areas of up to 250 square feet efficiently using a remote control.
This product is ideal for cooling small rooms up to 150 square feet with mechanical controls and energy-saving features.
Ideal for cooling, dehumidifying, and air circulation in single-room spaces with remote control convenience and energy efficiency.
Ideal for cooling medium-sized rooms efficiently, with WiFi connectivity and an easy-to-install full window view design.
This product is ideal for cooling, circulating, and dehumidifying small spaces up to 250 square feet.
The product is ideal for home air conditioning that is easy to install, energy-efficient, quiet, and smart-home enabled.
This product is ideal for cooling small rooms, with easy installation and energy-efficient features, perfect for those looking to save money.
This product is ideal for cooling small to medium sized rooms up to 340 square feet with a washable filter and remote control.

1. Midea Smart Window Ac – Ultra Quiet & Efficient.

The Midea U Smart Inverter AC unit is a game-changer for those looking for an ultra-quiet air conditioning solution. Its unique U-shape design blocks out exterior noise, while the high-efficiency Inverter system ensures minimal noise and vibration. With a noise level as low as 42 dBA, it's almost as quiet as a library, giving you a peaceful night's sleep or uninterrupted binge-watching sessions.

One of the biggest advantages of this AC unit is its energy-saving capabilities. The advanced DC Inverter technology ensures over 35% energy savings compared to traditional units, making it an eco-friendly choice. It's also the first window AC to receive the ENERGY STAR Most Efficient 2022 Certification, which means you may be eligible for exclusive benefits from your local energy distributor.

The Midea U-shaped design is not only aesthetically pleasing but also allows your window to open, bringing fresh air into your home. You can also maintain your view even when the unit is installed. The Anti-Theft Mechanism ensures the closed window stays locked for added security.

The Midea U Smart Inverter Air Conditioner is Wi-Fi enabled, allowing you to control it from anywhere using the MideaAir app on iOS or Android. You can also use voice commands through Alexa or Google Assistant. This smart control feature gives you the flexibility to operate the unit even when you're away from home.

Installing the Midea U AC unit is a breeze with the included quick-snap bracket. Simply set the unit on the bracket, secure the sidearms, and you're good to go. It's available for single-hung or double-hung windows with a size range of 22"-36" and a minimal height of 13.75".

2. Smartcool Window Ac – 10k Btu

The Haier Energy Star 10000 BTU Smart Window Air Conditioner is an efficient and easy-to-use cooling solution for rooms up to 450 sq ft. With a cooling capacity of 10000 BTUs, this unit is perfect for medium-sized areas like living rooms and family rooms. Plus, it is Energy Star-certified, which means it uses less energy and helps reduce your utility bills.

One of the standout features of this air conditioner is its smart operation. By integrating with the SmartHQ app, you can easily monitor, schedule, and control your unit from anywhere. You can also connect it with your favorite devices like Amazon Alexa and Google Assistant for added convenience. Of course, you can also use the included remote control for more traditional control options.

The Haier Energy Star 10000 BTU Smart Window Air Conditioner also comes equipped with an Eco Mode, which automatically turns off the fan and compressor when the room reaches its desired temperature. This helps save energy and money on your monthly bills. Additionally, the unit has three cooling modes and three fan speeds, so you can customize the temperature to your liking.

Installation and cleaning of this air conditioner is a breeze. It has a fixed chassis and installs easily in a double hung window (size: W 25 – 36.625" x H 14.563") with the included EZ Mount installation kit. The slide-out, washable filter makes cleaning simple and should be done every 30 days to keep your unit running optimally.

3. Efficient Window Ac: Cool 250 Sq. Ft.

Introducing the 6,000 BTU small window air conditioner, the perfect solution to keep your home cool and comfortable during the hottest summer months. This superior window unit AC offers four levels of cooling: auto, low, medium and high to ensure optimal indoor relief, regardless of the weather outside. With a full function remote control, digital display, and adjustable thermostat control, you can easily control your room's temperature in the range of 62˚F~86˚F.

This small window air conditioner is designed to provide consistent, quick, and highly effective cooling for rooms up to 250 square feet. It's perfect for bedrooms, offices, playrooms, cabins, living rooms, and apartments. This Energy Star air conditioner has a weight of 41.9 lbs and fits snugly into windows, making it easy to install with mounting hardware included. It can operate in the form of a dehumidifier when in dry mode and includes a fan-only function.

Not only does this window unit AC have auto modes and a remote control, but it also has Sleep, Dry, and Fan Modes, making it a breeze to use. The simple remote control and digital LED display panel with 24-hour timer programming allow you to precisely control the air temperature no matter where you are.

This small window air conditioner is easy to install and easy to clean. Simply attach the top rail using a screwdriver and follow the directions to ensure the AC unit window fits through your double hung window. Cleaning the window unit has never been easier with the removable, washable nylon filter. Just slide/lift out the filter when the automatic filter check light is active, rinse it thoroughly under running water, put it back, and enjoy clean, cool and fresh air. The 70.8” power cord length provides flexibility in placement.

As an Energy Star air conditioner, this window unit uses R32 refrigerant (.22 ounces), which has zero impact on the ozone layer and improves energy efficiency by up to 10% compared with R-410A. Because R32 is more efficient than R-410A, less refrigerant is needed, increasing the life of the 6k BTU window air conditioner. The energy saver feature comes complete with a timer/lock function and a 56-decibel sound rating, making it great for a cool day at home and great for the environment.

4. Rovsun Energy-Saving Window Ac For Small Rooms

The 5,000 BTU window-mounted air conditioner is an efficient cooling solution for compact rooms up to 150 square feet. With its fast cooling capabilities, this air conditioner can quickly cool down your home, office, or apartment to provide a comfortable environment even on the hottest days.

Operating this air conditioner is a breeze thanks to the easy-to-use operating knob. With four different modes and seven temperature options available, you can customize the cooling experience to your preferences. This makes it a convenient option for people of all ages, including the elderly and children.

In addition to its ease of use, this air conditioner is also energy-saving and eco-friendly. It features a high-quality compressor that ensures efficient cooling while extending the life of the unit. This design helps you save money on your energy bill while reducing your carbon footprint.

Assembling this air conditioner is a simple process thanks to the included side panels and installation parts. The detailed instruction manual provides clear guidance to make assembly a quick and easy task. However, it is important to confirm your window size before making a purchase to ensure that this air conditioner will fit properly.

For added peace of mind, this air conditioner comes with a one-year warranty. If you have any questions or concerns about this product, the manufacturer provides excellent customer service to ensure your satisfaction.

5. Rosewill 3-In-1 Portable Ac: Cool, Fan, Dehumidify.

Introducing the 3-in-1 Portable Air Conditioner, perfect for cooling spaces up to 200 square feet with its effective cooling system. This unit offers 3 convenient modes, allowing it to function as an air conditioner, fan, and dehumidifier. The built-in continuous drain design ensures efficient use and eliminates the need to constantly empty water buckets.

The air conditioner also comes equipped with washable dust filters, which trap dirt and debris before they accumulate, improving the indoor air quality and extending the life span of the unit. Additionally, the unit boasts two fan speeds, a Sleep Mode for energy-saving, and an automatic on/off timer that can be programmed up to 24 hours.

The space-saving design of the unit makes it perfect for single-room cooling, whether it's a bedroom, college dorm room, or apartment. The four easy mobility caster wheels make it simple to move from one room to another.

The user-friendly design of the air conditioner features a big LED digital display touch control panel and a full-function remote control, making it easy to adjust settings from a distance.

The self-evaporating system is an added bonus, as it draws moisture out of the room and evaporates it into the outside air, reducing the need to empty a water bucket (except in areas with high humidity).

6. Clearview Wifi Ac: Ultra Quiet & Energy-Efficient Cooling.

Introducing the Energy Star certified GE Profile window air conditioner, designed to provide a full window view without any obstruction. This sleek unit allows the window to open and close freely, while also letting in more natural light into the room.

Boasting an ultra quiet operation, this air conditioner produces sounds as low as 41 dB, which is the lowest in the market, making it the Quietest Window AC Brand in the US. Its ClearView feature ensures that the air flows without any disturbance, ensuring maximum comfort.

The industry exclusive flex-depth design of this unit is an adjustable chase-way that can accommodate wall thickness between 4.5" and 13.75", making it compatible with the majority of window sills in the US.

This GE Profile window air conditioner is also built-in with Wi-Fi, which enables you to control and monitor the device from anywhere using the SmartHQ app. This provides you with peace of mind, while compatibility with your favorite devices such as Amazon Alexa and Google Assistant makes everyday use easier and more versatile than ever. The included remote control also allows for easy operation of the unit.

With three fan speeds and four cooling modes, this unit provides total flexibility with optimal home comfort and air conditioner efficiency. Alternatively, set the Eco Mode, which automatically turns off the fan and compressor, saving you money on utilities. This air conditioner is perfect for medium-sized rooms, providing maximum comfort and convenience.

7. Midea Easycool 6k Ac: Cool & Dehumidify Effortlessly.

The Midea EasyCool Window Air Conditioner is the perfect solution for keeping your personal space comfortable. This versatile unit offers three modes of operation to ensure that your home, office, or apartment is always at the right temperature. It can quickly cool a space of up to 250 sq. ft., circulate air using its 3-speed fan, or reduce humidity with its dehumidifier mode. The unit is controlled via remote control, which makes adjusting the temperature, mode, and timer from across the room a breeze.

This Energy Star certified window air conditioner is highly energy-efficient, which can help you save money on your energy bills throughout the year. The unit comes with multiple custom settings to help you be even more energy-efficient, such as Eco mode and an EasyTimer feature that allows you to program a schedule that fits your needs.

The Midea EasyCool Window Air Conditioner is known for being quiet and easy to use. It is quieter than a household refrigerator, and the intuitive LED display and remote control make setting the time, temperature, and mode a breeze. The unit also comes with a removable and reusable air filter that protects your family and living space from dust and pet hairs.

Installation of this window AC unit is a breeze. You can easily install it in your home or apartment's existing window frame (23"-36"x14"), and all mounting accessories are included. Installation instructions are straightforward, and setting it up is easy. For some window frames, pilot holes are recommended before installing screws. A screwdriver is required, but not included, for installation.

Midea is a worldwide leader in air treatment products. Their motto is to help customers feel at home with each of their products. To demonstrate their commitment to quality and customer satisfaction, they offer a one-year parts and labor warranty on this product.

8. Smart Ac Unit: Easy Install, Energy Efficient

Introducing Windmill's newest 6000 BTU air conditioner, the perfect addition to any modern home. With its sleek curved edges, clean lines, and auto-dimming LED display, this AC unit blends seamlessly into your living space, providing a more comfortable environment for you and your loved ones. Designed to cool small spaces of up to 250 square feet, it's ideal for use in tiny houses, apartments, or any room that needs a bit of extra cooling.

One of the standout features of this room air conditioner is its easy installation process. Windmill has pre-assembled the installation kit, so you can set it up straight out of the box. If you need any help, their simple-to-follow installation guide will walk you through the process. And if you need an extra hand, their customer support team is always available to assist you.

Efficient cooling is key when it comes to air conditioning, and Windmill's AC unit is designed to deliver just that. Unlike other window air conditioners that blow air directly into your face, this wall AC unit is designed to provide the perfect angle for better airflow. It also uses a refrigerant that's less detrimental to the environment than what's commonly used, so you can feel good about your purchase.

With Windmill's AC unit, you can control your cooling system anytime and anywhere. It can be integrated into any smart home and controlled with your smartphone, making it easy to turn on 10 minutes before you get home on a hot day or shut it off remotely if you forget. If you prefer voice control, you can also use any voice assistant device to adjust the temperature.

Windmill is a company with 60 years of AC expertise, and they believe in beautiful, simple technology, better urban living, and good quality air. That's why they've designed this AC unit with today's needs in mind, combining a fresh, modern perspective with their extensive knowledge in the industry. With Windmill's AC unit, you can experience efficient, effective cooling in a stylish, user-friendly package.

9. Ge Profile Wifi Enabled Window Ac Unit.

The GE Profile Energy Star 6200 BTU Smart Window Air Conditioner is a smart and efficient cooling solution for small rooms up to 250 sq ft. With an ultra-quiet operation that reaches sounds as low as 40 dB, this air conditioner is the quietest window AC brand in the US. It keeps the air flowing with minimal disruption, making it perfect for your home or office.

The SmartHQ app integration allows you to monitor, schedule, and control your smart AC unit from anywhere, while compatibility with your favorite devices like Amazon Alexa and Google Assistant makes everyday use easier and more versatile than ever. The controller type is voice control, which means you can easily adjust the temperature and settings using your voice.

This 3-in-1 unit includes a dehumidify mode, which is a built-in air conditioner humidity setting that balances humidity levels in the room to maintain your comfort and make it easy to breathe. Three fan speeds and four cooling modes provide total flexibility with optimal home comfort and air conditioner efficiency. You can also set it to Eco Mode, which automatically turns off the fan and compressor, saving you money on utilities.

The GE Profile Energy Star 6200 BTU Smart Window Air Conditioner is designed for maximum comfort for small rooms. The easy installation kit and remote control are included so you can start cooling right away. With a wattage of 520.0 watts and a voltage of 115.0 volts, this air conditioner is energy efficient and cost-effective. The noise level is 63.0 decibels, ensuring that it won't disturb your peace and quiet.

10. Lg Wifi Ac: Ultra-Quiet, Easy Install & Cool

Looking for a reliable and efficient air conditioning unit to cool your small to medium-sized room? Look no further than this 8,000 BTU window air conditioner from LG.

With a cooling coverage of up to 350 square ft., this air conditioner is perfect for those hot summer days. But what sets it apart from other AC units is its LG ThinQ technology. With this feature, you can control your air conditioner from anywhere using the LG ThinQ app on your mobile device. You can even use voice commands with Google Assistant or Amazon Alexa.

Installation and cleaning are a breeze with this unit. It has a fixed chassis and comes with an EZ Mount installation kit for double hung windows. The slide-out filter makes cleaning quick and easy, and it should be done every 30 days to keep your unit running at its best.

To ensure that your air conditioner is working efficiently, it has an easy-to-clean washable dust filter that captures dust from the air. And if you forget to clean it, there's a check filter alert to remind you. Plus, the unit uses eco-friendly R32 refrigerant.

Other features of this air conditioner include a remote control, an easy window installation kit, and a sturdy and reliable build. Whether you're looking to cool your bedroom, office, or living room, this window AC unit is a great choice.

Best Ac Units Energy Efficiency FAQs

Are there any tax credits or rebates available for purchasing an energy-efficient AC unit?

Yes, there are tax credits and rebates available for purchasing an energy-efficient AC unit. The federal government offers a tax credit of up to 10% of the cost of the unit, up to a maximum of $500. However, this tax credit is only available for units that meet certain energy-efficiency requirements, such as having a SEER rating of 16 or higher. Additionally, some states and local governments offer their own tax credits or rebates for purchasing energy-efficient appliances, including AC units. It's important to check with your state and local government to see if any programs are available in your area. Finally, some utility companies offer rebates for purchasing energy-efficient appliances, including AC units. Again, it's important to check with your utility company to see if they offer any rebates for purchasing an energy-efficient AC unit. Overall, purchasing an energy-efficient AC unit can not only help reduce your energy bills but also provide potential tax credits and rebates to offset the cost.

Can an energy-efficient AC unit be used in conjunction with solar panels?

Yes, an energy-efficient AC unit can definitely be used in conjunction with solar panels. In fact, combining solar panels with an energy-efficient AC unit can be a great way to reduce your electricity bills and lower your carbon footprint.

Solar panels generate electricity by converting sunlight into usable energy, which can then be used to power your home’s appliances and devices. An energy-efficient AC unit, on the other hand, is designed to use less electricity than a traditional AC unit, which means it requires less energy to cool your home. When you combine the two, you can reduce your reliance on the grid and decrease your energy costs.

When installing solar panels and an energy-efficient AC unit, it’s important to work with a professional installer who can ensure that both systems are properly integrated and optimized for efficiency. This will help to ensure that you get the most out of your investment and enjoy the benefits of a more sustainable, energy-efficient home.

Do high-efficiency AC units cost more upfront?

Yes, high-efficiency AC units typically cost more upfront than standard AC units. This is because high-efficiency units use advanced technology and materials to provide greater energy efficiency and performance. However, while the initial cost may be higher, high-efficiency units can save homeowners money in the long run by reducing energy bills. They can also help to reduce the environmental impact of air conditioning by using less energy to cool a home. Additionally, high-efficiency units may qualify for rebates or tax credits from local or federal government programs. It is important to weigh the upfront cost against the long-term savings and environmental benefits when considering purchasing a high-efficiency AC unit. It is also recommended to consult with a professional HVAC technician to determine the best type of AC unit for your specific needs and budget.

How do I determine the energy efficiency of an AC unit?

To determine the energy efficiency of an AC unit, you need to look at its SEER rating. SEER stands for Seasonal Energy Efficiency Ratio, and it measures the cooling output of the unit in relation to the energy it consumes over a typical cooling season. The higher the SEER rating, the more efficient the unit is.

To find the SEER rating of an AC unit, you can check the manufacturer's specifications or look for the yellow EnergyGuide label that is required to be displayed on all new units. The EnergyGuide label will show the SEER rating as well as an estimated annual energy cost based on the unit's efficiency.

It's important to note that a higher SEER rating typically means a higher upfront cost for the unit, but it can also result in significant energy savings over time. So, when choosing an AC unit, it's important to consider both the upfront cost and the long-term energy savings to determine the best option for your needs and budget.

How do I properly maintain my energy-efficient AC unit to ensure maximum efficiency?

To properly maintain your energy-efficient AC unit, there are several steps you can take to ensure maximum efficiency. First, it's important to clean or replace the air filter regularly, as a dirty filter can cause your AC to work harder and use more energy. You should also clean the coils and fins on the outside unit, as dirt and debris can reduce airflow and efficiency. Additionally, make sure the thermostat is set to an appropriate temperature and consider using a programmable thermostat to adjust the temperature based on your schedule. It's also a good idea to have a professional technician perform a yearly maintenance checkup to inspect for any issues and ensure everything is running smoothly. Finally, consider shading the outside unit or using a fan to circulate air in your home, as this can help reduce the workload on your AC. By following these steps, you can help ensure your energy-efficient AC unit is running at maximum efficiency and saving you money on energy costs.

How much can I save on my energy bill with a high-efficiency AC unit?

The amount of money you can save on your energy bill with a high-efficiency AC unit depends on several factors such as the size of your home, the climate you live in, and the level of insulation in your home. However, on average, a high-efficiency AC unit can save you up to 20-40% on your energy bill compared to a standard AC unit. This is because high-efficiency AC units use advanced technology such as variable-speed compressors, which allow the unit to adjust its output based on the cooling needs of your home, and high SEER (Seasonal Energy Efficiency Ratio) ratings, which measure the efficiency of the unit. Additionally, high-efficiency AC units are designed to run on less energy, which reduces your energy consumption and ultimately your energy bill. Overall, investing in a high-efficiency AC unit can lead to significant long-term savings on your energy bills.

What are some common misconceptions about energy-efficient AC units?

One common misconception about energy-efficient AC units is that they are less effective in cooling a room than traditional units. However, this is not true. Energy-efficient AC units are designed to cool a room just as effectively as traditional units but with less energy consumption. Another misconception is that energy-efficient AC units are more expensive than traditional units. While the initial cost may be higher, the long-term savings on energy bills will offset the initial cost. It is also a common misconception that energy-efficient AC units require more maintenance than traditional units. In fact, energy-efficient units require the same amount of maintenance as traditional units. Lastly, there is a misconception that energy-efficient AC units are only suitable for warmer climates. Energy-efficient units are designed to work in a variety of climates and can be effective in both warm and cool environments.

What are the environmental benefits of using an energy-efficient AC unit?

There are several environmental benefits of using an energy-efficient AC unit. Firstly, an energy-efficient AC unit helps to reduce energy consumption and, therefore, lowers the amount of greenhouse gas emissions that are released into the atmosphere. This helps to mitigate climate change and reduce the carbon footprint of the building.

Secondly, an energy-efficient AC unit uses less energy, which can help to reduce the demand for electricity, thereby reducing the need for new power plants and transmission lines. This can help to reduce the environmental impact of electricity generation, which often involves the burning of fossil fuels.

Thirdly, an energy-efficient AC unit can help to reduce the amount of water used for cooling, which is particularly important in dry or drought-prone areas where water resources are scarce. By reducing water consumption, an energy-efficient AC unit can help to conserve water resources and protect ecosystems.

Overall, using an energy-efficient AC unit can help to reduce the environmental impact of cooling systems, lower greenhouse gas emissions, conserve energy and water resources, and mitigate climate change.

What are the most energy-efficient AC units on the market?

There are several energy-efficient AC units available on the market today. One of the most energy-efficient options is the mini-split system. This type of AC system uses a small outdoor unit that is connected to one or more indoor units. Mini-split systems are highly efficient because they can be customized to cool specific zones or rooms in your home, rather than cooling your entire home at once.

Another energy-efficient option is the variable refrigerant flow (VRF) system. This type of system uses advanced technology to regulate the flow of refrigerant to different parts of your home, which helps to reduce energy usage and save money on your energy bills.

Additionally, some of the top brands known for producing highly energy-efficient AC units include Carrier, Trane, and Lennox. When shopping for an AC unit, it's important to look for models with high SEER (Seasonal Energy Efficiency Ratio) ratings, which indicate how energy-efficient the unit is. It's also a good idea to consult with an HVAC professional to determine the best AC unit for your specific needs and budget.

What features should I look for in an energy-efficient AC unit?

When looking for an energy-efficient AC unit, there are several features that you should consider.

First, look for a unit with a high SEER rating. SEER stands for Seasonal Energy Efficiency Rating and measures the cooling output of the unit over a season divided by the energy it uses. A higher SEER rating means the unit is more energy-efficient.

Second, consider the type of compressor the unit has. A two-stage compressor can adjust its output to match the cooling needs, while a variable-speed compressor can adjust its output even more precisely, making it more energy-efficient.

Third, look for a unit with a programmable thermostat. This will allow you to set the temperature to automatically adjust when you are away or asleep, saving energy and money.

Fourth, consider the size of the unit. An oversized unit will waste energy by cycling on and off frequently, while an undersized unit will have to work harder to cool your home, also wasting energy.

Finally, look for a unit with a high-quality air filter. This will help keep the unit running efficiently and improve indoor air quality.