# Size Air Conditioning for a House and Figure the Size of an Air Conditioner

Heating, ventilation and air conditioning HVAC units provide year-round comfort when properly sized. Air conditioning AC units are sized based upon the British thermal unit BTU, which is the measurement of heat that the AC unit removes from the air. Determining the right size of AC unit to install in a house requires measuring the square footage of a room, comparing the measurement to established levels, and tweaking the measurements for specific rooms.

**How to Size Air Conditioning for a House**

The process applies to a single room or numerous rooms, depending on your needs. Measure the square footage of each room that will be linked to the AC unit individually, including hallways. Calculate the square footage, or area, by multiplying the length of the room by the width of the room.

Convert each rooms square footage into BTUs. Rooms from 100 to 150 square feet most bedrooms need 5,000 BTUs. Rooms from 150 to 250 square feet require 6,000 BTUs, and rooms from 250 to 350 square feet need 7,000 BTUs.

Add 4,000 BTUs to a kitchen and 1,000 to a bathroom. Add each rooms BTU needs together to determine the total BTUs needed for the house. Convert the total BTUs to tons, which is the standard measurement of AC units.

For example, 1. 5 tons equal 18,000 BTUs, 2 tons are 24,000 BTUs, 2. 5 tons are 30,000 BTUs, 3 tons are 36,000 BTUs, 3.

5 tons are 42,000 BTUs, 4 tons equal 48,000 BTUs and 5 tons equal 60,000 BTUs. The ton size is the size of AC unit needed to cool your house properly. .

**How to Figure the Size of an Air Conditioner**

Take the model number to any dealer and they can determine the units size from the code. You can also calculate the square footage of the area connected to the unit, convert the area to BTUs, and convert the BTUs to tons. Measure the square footage of each room that is attached or will be attached to the AC unit.

Multiply the length of the room by the width of the room. Remember to calculate all rooms including hallways. You do not need to measure closets or other rooms that are not connected and are sealed off from the AC unit.

Measure connected rooms, such as an open-floor plan kitchen and living room, separately. Convert the square footage into total BTUs. One hundred to 150-square-foot rooms most bedrooms are 5,000 BTUs.

Rooms from 150 to 250 square feet require 6,000 BTUs and rooms from 250 to 350 square feet need 7,000 BTUs. Add 4,000 BTUs for the kitchen, and 1,000 for bathrooms. Add each rooms BTUs together to determine the total house BTUs.

Convert the total BTUs to tons, which is the standard measurement of AC units. 1. 5 tons equals 18,000 BTUs, 2 tons is 24,000 BTUs, 2.

5 tons is 30,000 BTUs, 3 tons is 36,000 BTUs, 3. 5 tons is 42,000 BTUs, 4 tons equals 48,000 BTUs, and 5 tons equals 60,000 BTUs. The ton size is the size of AC unit needed to properly cool your house.

Sizing an AC Air Conditioner unit requires calculating square footage of a room or house. Replacing a damaged unit makes the job easier. The model number on the outside fan has a two digit code that corresponds with the size of the unit, measured in tons.

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