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Close blinds or curtains on sun-facing windows, then use a portable fan to move air across the people in the room. If it is cooler and the air is clean outside, open windows to exchange hot indoor air for cooler air. These steps can improve comfort, but a fan alone will not lower the room’s air temperature.
Block sunlight and reduce heat entering the room
Start with the windows that receive direct sun. Close blinds or curtains before sunlight warms the room, paying particular attention to south- and west-facing windows during strong summer sun. Room-darkening curtains can help limit incoming sunlight.
Also check for obvious gaps that let hot outdoor air enter. Use caulk for stationary cracks and weather-stripping around movable joints such as doors and windows. Avoid sealing a room indiscriminately: the U.S. Department of Energy cautions that over-sealing can affect indoor air quality.
Use a fan for personal comfort
A portable fan can make people feel cooler by moving air across their skin and helping moisture evaporate. It does not create cool air or remove heat from the room. Aim it to circulate air through the occupied area, and turn it off when nobody is there.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
The DOE’s guidance that a ceiling fan can let a thermostat be raised about 4°F without loss of comfort is a ceiling-fan comfort claim—not a promise that a portable fan will lower room temperature by 4°F.
Ventilate when outdoor conditions are favorable
If the outdoor air is cooler than the room’s air, clean, and safe to let in, open windows to bring in cooler air and let warmer indoor air escape. This is most useful during cooler hours, often at night. Night flushing can cool a home’s thermal mass, and works best when nights are cool and there are regular breezes.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Do not rely on open-window ventilation for cooling when outdoor air quality is poor. In hot, humid climates, ventilation is not an effective cooling strategy; bringing in humid outdoor air may make the room less comfortable. Close windows again when outside conditions no longer help.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Consider evaporative cooling only in hot, dry conditions
An evaporative cooler may help in a hot, low-humidity climate. It cools through evaporation, adds moisture to the air, and needs warmer indoor air to leave the space. That means it is not a universal substitute for air conditioning in a sealed room. If the room cannot exchange air—or the climate is humid—this approach is a poor fit.
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Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Choose the approach that matches the room
| Method | What it does | When it makes sense | Key limitation |
|---|---|---|---|
| Blinds or curtains | Reduces solar heat entering through windows | When direct sunlight reaches the room | Blocks heat gain; does not remove heat already in the room |
| Portable fan | Moves existing air to improve comfort | When people are in the room and can feel the airflow | Does not lower room air temperature |
| Window ventilation | Exchanges indoor air for outdoor air | When outdoors is cooler and air quality is acceptable | Depends on outdoor temperature, humidity, air quality, and safe access to open windows |
| Evaporative cooler | Uses evaporation to cool while adding moisture and pushing warmer air out | In hot, dry conditions with a way for air to leave | Less suitable in humid conditions or a sealed room |
| Caulk or weather-stripping | Reduces hot-air leaks through gaps | Where obvious cracks or movable-joint gaps admit outdoor air | Over-sealing can affect indoor air quality |
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