Yes. You can install the AC unit yourself. However, you will need a specific set of tools and some experience with hardware. Depending on the type of AC unit each installation will be different. Overall, self-installation is possible with a ladder, drill, nails, and the right safety equipment. It has the perks of developing new abilities, saving initial installation costs, and the freedom to explore your AC’s hardware but also has the disadvantage of manual labor, violation of warranty, and long hours of effort. If you choose to replace an old AC with a new one, you may also need a special certification to do so.

To figure out how big an air conditioner you'll need for a room, multiply the room's length by its width. Then multiply that by 25 BTU to achieve a sufficient amount of cooling for the room in all weather conditions.AC size is determined in terms of weight. i.e., tons. The larger the area, the heavier will be the AC’s compressor. For example, a 600-1000 square feet area needs a 1.5-tons air conditioner, 100-1500 square feet, a 2-tons AC, 1500-2000 square feet, a 3-tons AC, and 2000-2500 square feet, a 4-tons AC respectively.