baydee Door and window picture

horizontal window ac unit: A Guide to Choosing the Right One

With summer just around the corner, it’s time to start thinking about how to keep your home cool and comfortable during the hot months. One option for cooling your home is a horizontal window ac unit. These units are designed to fit easily into a horizontal window, making them a great choice for apartments, small homes, or any space where you need cooling but don’t want to deal with a bulky, cumbersome unit. In this article, we’ll take a look at horizontal window ac units and help you choose the right one for your home.

Size Matters

The first thing to consider when choosing a horizontal window ac unit is the size of your room. You want to make sure the unit you choose is appropriately sized for the space you intend to cool. If you choose a unit that is too small, it will struggle to keep up with the demand and won’t be effective at cooling the room. If you choose a unit that is too large, it will waste energy and money, and may even short cycle, which can lead to excess humidity.

To determine the appropriate size of your window AC unit, you need to measure the square footage of the room you want to cool. As a general rule, you need 20 BTUs of cooling power per square foot of space. So, if your room is 200 square feet, you need a unit with at least 4,000 BTUs of cooling power. If your room is 500 square feet, you need a unit with at least 10,000 BTUs of cooling power.

Energy Efficiency

Once you’ve determined the appropriate size for your horizontal window ac unit, you want to consider its energy efficiency. An energy-efficient unit can save you money on your electricity bill and reduce your carbon footprint. Look for units with an Energy Star rating, which indicates that they meet energy efficiency guidelines set by the U.S. Environmental Protection Agency.

Another factor to consider when it comes to energy efficiency is the unit’s EER rating. EER stands for Energy Efficiency Ratio, and it measures the unit’s cooling output per watt of electricity used. The higher the EER rating, the more energy-efficient the unit is. Look for units with an EER rating of 10 or higher.

Installation and Maintenance

Installing a horizontal window ac unit is relatively straightforward, but you want to make sure you have all the necessary tools and equipment before you begin. Most units come with an installation kit, which includes mounting brackets, foam insulation, and weatherstripping. Make sure you have the appropriate screwdrivers and pliers for the job.

Once your unit is installed, you want to make sure you maintain it regularly to keep it running smoothly and efficiently. Replace the air filter every one to three months, depending on the manufacturer’s instructions. Clean the exterior of the unit regularly to remove dirt and debris, which can decrease its efficiency.


Choosing a horizontal window ac unit requires some careful consideration, but with the right information, you can find the perfect unit for your home. Remember to measure your room, consider energy efficiency, and think about installation and maintenance before making your final decision. With a little bit of research, you can stay cool and comfortable all summer long.