Upgrade a Basic Bookcase

Put a personal spin on an off-the-shelf bookcase with these easy DIY makeover ideas.

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Stairway Railing Ideas

Stairway railings serve more than a functional purpose -- they give stairs a visual presence and make a staircase a work of art. Find ideas for the perfect railing for your stairway.

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Beach Chic Porch Renovation

A family put a new roof over their heads by turning their back deck into a coastal-inspired covered porch. Learn how they made the big change from their existing porch to their new, cozy family hangout area.

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Give a Plain Mirror a Makeover

Take a plain mirror to the next level with these easy DIY embellishments.

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DIY Outdoor and Garden Projects

Sprucing up your outdoor space doesn't need to be a massive undertaking. Use these inspirational small projects -- including painting rocks to hanging new house numbers -- to instantly improve the look of a garden, patio, deck, or backyard.

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Add Storage Around Stairs

Step up your home's storage capacity by making the most of underused areas below and beside your stairs. Here's a look at 18 homes that beautifully optimized stairwell and staircase spaces.

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Popular in Home Improvement

Window Air Conditioner Size Calculator

What size window air conditioner unit do you need? This estimator will help you assess the right model for your room.

Cubic area of room to be cooled:
Direction the room faces (choose one) North
South
East
West
Condition of your insulation (choose one) Good
Fair
Poor
Number of BTUs recommended:

Please note: For your convenience, this calculation has been rounded up slightly.

Important reminder: Every effort has been made to ensure the accuracy of this calculation. But before purchasing materials for any project, please check amounts with your suppliers or contractors.

Helpful Information

When choosing a window air conditioner, don't assume that buying the most powerful model is the best choice. An air conditioner that is too powerful for the room will not remove enough humidity, because it cools too quickly. And of course, a model that is too weak will fail to make a room comfortable. The cooling power of an air conditioner is calculated in British Thermal Units (BTUs). (One BTU is enough energy to heat one pound of water by 1 degree F.)

A few tips: If you need to install a unit that delivers 12,000 BTUs or more, have an electrician install a 240-volt receptacle. Smaller units can be plugged into a standard 120-volt receptacle, but make sure that by doing so you will not overload the circuit (see our Circuit Load estimator).

Other factors to consider: If the room is directly above a room with no air conditioning; if more than three people typically inhabit the room; or if the room's door will often be opened and closed, buy a model approximately 1,000 BTUs stronger than indicated by this calculator.

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