For an inexpensive way to cool one room, a window air conditioner is the strongest category to start with: Consumer Reports describes window units as one of the least expensive room-cooling options. But the available evidence does not establish a reliable list of the cheapest 2025 models or their prices. The better way to shop is to match capacity to your room, check efficiency and window fit, and compare current local prices. This guide uses buying guidance current through October 2026; it does not present current models or prices as 2025 bargains.
Why window air conditioners are the budget starting point
A window unit is often a practical choice when you need to cool a single room rather than a whole home. Consumer Reports identifies window air conditioners as one of the least expensive ways to cool a room. That supports choosing the category as a starting point, not declaring a particular model the cheapest or best: no model-specific test results or dated 2025 prices are established here.
Portable air conditioners may make sense when a window cannot accommodate a unit, but the available evidence does not identify a low-cost portable winner. The U.S. Department of Energy’s Federal Energy Management Program room-air-conditioner efficiency guidance also excludes portable units, so its comparison should not be applied to them.
Choose capacity for the room, not the biggest number
Cooling capacity is measured in Btu per hour (Btu/h). Use the room’s floor area as the starting point, then account for sun, shade, occupants, and cooking. Consumer Reports’ February 10, 2026 buying guide gives a general range of 5,000–6,500 Btu/h for a 100–250-square-foot small room. ENERGY STAR’s current room-air-conditioner chart breaks that range into more specific bands:
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- PERFECT FOR SMALLER ROOMS - Midea's Affordable Window AC unit is perfect to help your room be as comfortable as possible. It can cool 150 sq. ft. with 7 temperature settings, 2 cooling/2 fan-only speeds, and 2-way air direction to give you the perfect amount of cooling every time.
- ENERGY EFFICIENT- Midea's 5,000 BTU window air conditioner has a Combined Energy Efficiency Rate (CEER) of 11.0 which helps reduce the energy costs to save you money throughout the year.
- QUIET & EASY TO USE - This window AC unit is quieter than a household refrigerator. It also features easy-to-use mechanical controls to quickly set the time, temperature, and mode and has a removable & reusable air filter.
- EASY INSTALLATION - Easily install in your home or apartment's existing window frame. Suitable for windows 23''-36'' wide and minimum 13'' high. All mounting accessories are included. A screwdriver is required (but not included) for installation. For some window frames, pilot holes are recommended before installing screws. Please see included instruction manual for further detail.
- WARRANTY: 1 Year Parts & Labor Warranty comes with each Midea product to ensure the quality of our brand to our customers. Our team is happy to help if any questions or issues arise and make sure to register your product on our website for even faster support in the future.
| Room area | Starting capacity |
|---|---|
| 100–150 square feet | 5,000 Btu/h |
| 150–250 square feet | 6,000 Btu/h |
ENERGY STAR also recommends adjusting the chart’s result for conditions: reduce capacity by 10% for a heavily shaded room, increase it by 10% for a very sunny room, add 600 Btu/h for each regular occupant beyond two, and add 4,000 Btu/h for a kitchen. These adjustments are guidance for sizing, not a substitute for checking a specific unit’s capacity and installation requirements.
Buying an oversized unit is not a safe shortcut. ENERGY STAR warns that it can cost more and waste energy; because it may cool the room before removing enough humidity, the room can feel clammy. Start with the room’s area and conditions rather than choosing the largest unit your budget allows. See ENERGY STAR room air conditioner buying guidance.
Compare efficiency as well as the sticker price
A low purchase price does not show what a unit will cost to run. ENERGY STAR says its certified room air conditioners are at least 19–36% more efficient than federal minimum standards. The percentage is a comparison with those standards, not a guaranteed reduction in an individual household’s bill; actual energy use depends on the unit, how it is used, and local electricity rates. Check the model’s ENERGY STAR status and its Combined Energy Efficiency Ratio (CEER), then consider expected use and your local rate alongside the upfront price. Check ENERGY STAR room air conditioner criteria.
Rank #2
- BEST FOR SMALL ROOMS: Cools up to 150 sq ft efficiently with 5,000 BTU cooling power. Ideal for bedrooms, home offices, dorm rooms, workshops, and studio apartments. Compact 16.4" W x 13.4" D x 12.6" H design fits tight spaces.
- QUIET OPERATION - Quieter than many older window AC units, with 2 cooling modes (low 52 dBA for nighttime, high 56 dBA for rapid cooling) and 2 fan speeds for personalized comfort. Simple mechanical controls mean no annoying digital beeps.
- SIMPLE, RELIABLE MECHANICAL CONTROLS: Easy-to-use dials for temperature and fan speed—no Wi-Fi, apps or complex setup required. 10 temperature settings let you dial in your perfect comfort level. Auto restart after power outages.
- LOW MAINTENANCE & ENERGY SMART: No manual draining under normal conditions. Washable, reusable filter for easy care. Low 440W power draw helps reduce energy costs compared to older, inefficient units.
- EASY DIY INSTALLATION: Fixed chassis installs easily and fits double-hung windows 27.125"–36" wide and 13.375" high minimum. EZ Mount kit with foam insulation included. Backed by 1-year GE limited warranty for peace of mind.
ENERGY STAR’s 2025 Most Efficient recognition applied during calendar year 2025 and required both ENERGY STAR certification and CEER thresholds specific to the product class. That recognition is a dated efficiency distinction, not proof that a product was the cheapest or best-value air conditioner of 2025. Review ENERGY STAR Most Efficient criteria.
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Check the window, installation style, and useful features
Before comparing prices, make sure the unit’s installation method suits your window. Standard window units require a compatible opening and secure installation. ENERGY STAR notes that some U-shaped designs can leave the window operable and place the compressor outside. If quiet operation and efficient output matter, look for a variable-speed compressor: it can adjust output rather than simply running at one fixed level, and ENERGY STAR identifies this as a way to support efficient, quieter cooling.
Rank #3
- Effortless Cooling: Achieve optimal comfort with customizable temperature settings and two fan speeds; Effortless Temperature Control helps to maintain your preset temperatures for consistent comfort
- Easy Maintenance: Keep your air conditioner running efficiently with the easy-to-clean washable filter, designed to capture dust from the air for long-lasting performance
- Undisturbed Comfort: Experience a peaceful home environment with a quiet performance at 52 dBA – ideal for bedrooms or small spaces up to 150 sq. ft.
- Effortless Convenience: Benefit from the Auto Restart feature, which automatically restores the unit's previous settings once power is restored to the window air conditioner
- Hassle-Free Operation: The extra-long three-prong power cord eliminates the need for extension cords, while the adjustable side panels easily extend to best fit your window, ensuring a secure installation with optimal efficiency and airflow
Installation quality affects comfort and energy loss. ENERGY STAR states, “An improperly installed room air conditioner leaks as much air as a 6-square-inch hole, increasing energy costs and making your home less comfortable.” Follow the unit’s instructions and use the supplied insulation materials to seal gaps. Also compare filter access, controls, warranty terms, and any included sealing materials; these affect day-to-day ownership but are not established as advantages of any specific model here.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.A practical checklist for finding a genuinely good cheap unit
- Measure the room. Use floor area and ENERGY STAR’s capacity chart as a starting point, then apply the listed adjustments for shade, sun, extra occupants, or a kitchen.
- Confirm the window fit. Check the model’s required window dimensions and installation style against your actual opening before buying.
- Compare efficiency. Verify ENERGY STAR certification and compare CEER for the models you are considering.
- Consider operating cost and comfort. Use your expected hours of use and local electricity rate; compare noise-related features such as variable-speed operation.
- Check the ownership details. Review warranty, filter access, controls, and supplied insulation materials, as well as the current price from a seller serving your area.
Consumer Reports says its predicted reliability and satisfaction ratings draw on member feedback for more than 4,000 window air conditioners bought new between 2014 and 2024. That is a substantial historical sample, but it does not establish a 2025 price or identify a current cheapest model. Its buying guide was updated February 10, 2026, so use its reliability context as historical evidence rather than a ranking of 2025 bargains. Read the Consumer Reports air conditioner buying guide.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
