Air Conditioning Calculator Helps Determine Unit Size

Posted: Jul 15, 2007 | Comments: 5 | Views: 24,404 | Bookmark and Share

If you have even a passing interest in the topic of air conditioning calculator, then you should take a look at the following information. This enlightening article presents some of the latest news on the subject of air conditioning calculator.

Most of this information comes straight from the air conditioning calculator pros. Careful reading to the end virtually guarantees that you'll know what they know.

One of the biggest questions people have when deciding to buy an air conditioner is what size they need. There are different ways to figure this out based on room size and anticipated outside temperatures, but the easiest method involves using an air conditioning calculator, and many are available as free download with you computer or available for use online.

Air conditioners, like heaters are rated in BTU�s, or British Thermal Units indicating the amount of air, in cubic feet, which will have its temperature altered by one degree in one hour. For example, a 10,000 BTU air conditioner is supposed to be able to reduce the temperature of 10,000 cubic feet of air by one degree in one hour. An air conditioning calculator would show that a 10,000 BTU air conditioner would work in a room with between 350 to 400 square feet with good insulation, no afternoon sun exposure and no kitchen.

Figuring out the size of a needed air conditioning unit is more than just the size of the room, however as the amount and quality of the room�s insulation will play a major role in determining the need. Additionally, afternoon sun tends to be hotter than morning exposure and the presence of a kitchen will also increase potential need. With an air conditioning calculator available free online, you can include these variables and determine the correct size air conditioner for your specific use.

Larger Units Do Not Work As Hard

If using an air conditioning calculator advises that you buy a 13,000 BTU unit and they are available in 12,000 and 15,000 depending on the price difference between the two units, it is best to go with the larger of the two. The air conditioner will not have to work as hard and will be able to cool the room more efficiently. Chances are it will not run as often, saving money on the cost of electricity.

Using other calculators, available from most electric suppliers, you can also estimate the cost of operating each size unit based on monthly and annual cost. While larger units will cost more to operate, a slightly oversized air conditioner may be cheaper in the long run as it runs less. Using the air conditioning calculator can help choose the right size for your individual use. It can also be helpful to determine if one large unit or two or three smaller units would be more economical for your use.

Now might be a good time to write down the main points covered above. The act of putting it down on paper will help you remember what's important about an air conditioning calculator.

(ArticlesBase SC #181886)

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    Comments on this article

    7
    1. jack little June 26, 2008
    what tonnage do i need for 2900 sq foot house
    8 in block foam filled 10 foot ceilings 250 sq ft windows face west single story r 30 attic
    metal roof and radiant barrier in attic.
    thanks Jack
    1
    2. hvac tech July 26, 2008
    The statement that you should always go one step up on your air conditioner size selection is a poor statement and is wrong. Over sizing an air conditioner is detrimental to indoor air quality. An air conditioning system has 2 purposes, to cool and remove humidity. An over sized air conditioner will not run long enough to lower the humidity in the house doing two things, keeping humidity levels at an unhealthy level and also making it feel warmer than it actually is. Molds thrive at humidity levels over 50% and facts show that mold growth is drastically reduced at levels of 45% and lower. Also if the humidity level is above 50% the space will typically "feel" 3 to 4 degrees warmer than it actually is resulting in people turning the thermostat down even further.
    If your heat load calculation falls between to unit sizes, it is more often beneficial to select the smaller unit. There are many other reasons why an over sized system will not save you money. System efficiencies are rated in percentage. If you have 2 systems side by side and just for easy numbers 1 is twice the size of the other, both systems are 90% efficient, this means that 10% of the energy used is ``wasted``. So the bigger unit is ``wasting`` twice as much energy. Jack to answer your question, google Manual J and ask the contractor you choose for a copy of the heat load calculation they have used to select your system. Going on square footage alone (which a lot of contractors do) is not the proper way to size a system and more often than not results in improper size selection.
    2
    3. john July 26, 2008
    Also the explanation of btu`s is a little off. One BTU is the ammount of heat required to change the temperature of one pound of water one degree f. A properly sized air system will move aproximately 400 cubic feet per minute of air per ton of cooling. 12000 btu`s/hr will change the temperature of 400 cubic feet per minute of air aproximately 20 degrees. (if the air going into the air conditioning coil is 75 degrees, it will be supplying aproximatelt 55 degree air out of the registers)
    1
    4. Jean Jules DEFFO August 07, 2008
    I need the airconditiong desing toolkit
    1
    5. Rick July 21, 2009
    need tons in two units hs29-411-1p and hs6-411-1fw?
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