Stay cool all summer long with our expert guide to installing a window air conditioner.

Choosing a Window Air Conditioner

Window air conditioners come invarious sizesand with a wide range of features.

To get started, measure your window and shop for units that fit within its dimensions.

Window air conditioning unit installed in window

Credit: bgwalker / Getty Images

The most important spec to note when shopping for window air conditioners is the square footage rating.

While purchasing a suitably sized air conditioning unit is a must, some features are worth splurging on.

Smart Units

Smart units can be controlled by your smartphone or tablet, making operation a breeze.

However, many cities mandate the use of support bases for safety reasons.

Look into your local laws and building codes to determine whether you need a support base.

Ready to get started?

Grab the tools and supplies below and follow our step-by-step installation guide.

Step 1: Open Window and Clean Sill.Open your window by sliding the bottom sash all the way upward.

Remove the screen if in place.

Inspect the sill at the bottom that the window slides into when closed and remove any dirt or debris.

Call in a helper at this point if needed.

To hold the unit in place, slide the window behind the top rail.

If properly secured, the weight of the unit will hold it in place.

Step 5: Install Window Locks.

Above the top of the window panel, install sliding window security locks.

This will ensure the window can’t be bumped out of position, causing the unit to fall.

Additionally, this will prevent outsiders from being able to slide the window open.

This will help keep the unit from moving from side to side.

Use the included hardware to secure the slides in place.

Maintaining a Window Air Conditioner