EnerGuide Room Air Conditioner Directory 2006How to Size a Room Air Conditioner(Worksheet 1) To buy an energy-efficient room air conditioner, you must first determine what capacity, or size, you need. This is important for two reasons:
Use the simple calculation method described below to estimate the cooling capacity you'll need to maintain a temperature of 24°C with a humidity level of between 30 and 50 percent. You can find a more detailed calculation method in another NRCan publication entitled Air Conditioning Your Home (the “Useful Information Sources” explains how you can order this booklet or view it on-line). If you're cooling a large space, consult a qualified contractor who will consider such factors as the amount of space to be cooled, the number of occupants, the insulation levels and the size, orientation and R-value of windows and doors. Step 1 – Calculate the floor area of the space to be cooled.To calculate floor area, multiply the length of each room or open space by its width. Don't estimate – take a few minutes to measure accurately. Units are often bought to cool one or two rooms. Enter your numbers into the blanks provided. (The calculation for a typical open-concept living/dining room will guide you through the process.)
Remember to combine the total floor area of all the space you'd like to cool with a single air conditioner. Step 2 – Calculate the basic cooling capacity you'll need to meet the typical Canadian cooling load.Use this table to find the basic cooling capacity in Btu/h you'll need based on total floor area to be cooled.
*Based on rooms with two occupants and average windows, insulation and sun exposure.
Note: If cooling capacity is more than 12 000 Btu/h, consider installing two smaller units. Otherwise, a single unit might require a larger amperage circuit (20-30 amperes) or a dedicated 240-volt circuit; consult an electrician for more information. Step 3 – Answer the questions in Worksheet 1 (below)If a question doesn't apply to your situation, leave the space blank. Then add or subtract from the basic cooling capacity to arrive at the approximate size of room air conditioner you should buy. Worksheet 1
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