How do I know what
size air conditioner to get?
exactly size an A/C unit for a specific area requires a heat load calculation
which is a bit complicated and is usually made by a licensed HVAC contractor
who is experienced and qualified to make these calculations.
A quick and easy rule of thumb to use for sizing an air conditioner for a room
or house is
the square foot method. This formula is used only for a quick approximate
and is based on certain guidelines regarding insulation R values, shading,
ceiling height, construction materials, windows, doors, purpose of use and
layman's terms 1 ton of cooling capacity is equal to 12,000BTU of cooling
capacity and 600 square feet of residential living space requires 1 ton of
cooling capacity based on adequate insulation, 8' ceiling height and tight
windows and doors.
calculate your requirement using this method get the total square footage of
living space and divide that number by 600. The answer is the number in tons of
air conditioning capacity required. To convert tonnage to BTU's simply
multiply by 12,000. This general rule of thumb method can be used for
approximate sizing of both central and room air conditioning equipment.
don't forget! Dirt is the biggest enemy of your air conditioner, and a
good air filter is the best friend! Giving your air conditioning
system an efficient, high MERV rating air filter is the best thing you can do
for your air conditioner. A good air filter will
extend the life of your air conditioner because the important parts, like the
blower assembly, the cooling coil, and other inner parts will stay
cleaner, operate more efficiently and last longer.
And, as a side benefit of having a good air filter, your family and you
will enjoy breathing much healthier indoor air. Air that will be free of
dustmites, mold, mildew, dust, pet dander, etc. etc.