How many BTUs should an air conditioner have to cool a large bedroom?
Answer:
8000-10,000make sure the EER is above 10 and make sure the air conditioner has 3 fan speeds and 3 cooling settings plus if possible use a ceiling fan in conjunction with it. Also check to see how many pints it de-humidifies per hour , the more the better especially if you live in an area of the country or world where the humidity is high during the summertime, hope this answers all you questions.It's not cost efficient to buy a used air conditioner either because you will have no warranty.
I am using a 5000 BTU in a room that is about 12x18 and it works really well on the low setting. You could probably get away with 5000-6000 BTU's for your room.
360sq ft so you would have to have atleast 10,000BTU to cool effeciantly. For high ceilings at 10% to that and if you have a room that has alot of light and sun all the time add an additional 10%-20% BTUs. Hope this helps
The space alone does not give you the precise calculation. HVAC requirements also have to factor other environmental factors such as air movement to and from other areas, insulation rating, outside temperature factors as well.
If this room was isolated from the rest of the home with insulated walls and on a North side of the home you may find a smaller unit adequate. Where the same room on the south side of a home with a low R rating and lots of air movement may require a higher rating.
I pasted this from a website that illustrates exactly WHY square footage alone cannot answer your question: (Pardon that it is HEAT not cool related, but SAME CONCEPT applies):
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A typical question: Help heat my square feet in unspecified location with unknown equipment. How much?
This is a very frequent question on web HVAC forums as hundreds of thousands of homes built since the 1960's using ducted air heat have this problem. It is a result of two HVAC contractor medical conditions:
The estimator hasn't had sufficient education in heat estimating and air flow, so:
his THUMB has become his most important means of guessing, instead of his brain.
he depends on his SQUARE FEET.
If your house is:
poorly insulated, 150 square foot would require about 12,000 btuh in northern USA or lower Canada, or about 6000 btuh in Florida.
insulated like many houses in the 1960's with 2-inches of fiberglass around, your room would need about 6000 btuh in northern USA or lower Canada, or about 3000 btuh in Florida.
insulated like houses built today according to code, your room would need about 3750 btuh in northern USA or lower Canada, or about 1800 btuh in Florida.
This estimate can change upon how tightly your house is joined at seams, whether Tyvek is applied, and how many square feet of windows of which type are in the room.
As you can see from this information, telling people that you have square feet isn't as much help as desired. There is a real world where insulation, location and construction matters, in spite of people telling you that square feet is a good place to start guessing about what equipment to buy. In other words, though do-it-yourselfers buy wall board, flooring, roofing, etc., by the square feet, it is NOT the way to size heating equipment which has different heating needs depending upon how much insulation you put BEHIND the sq ft where you can't see it - and the weather in a location the house is actually built upon.
With little understanding of heat loss, the guesstimator forgets that rooms over unheated garages have:
a large floor loss
often there are three walls exposed to the outdoors on an end room
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Now that you have an idea the calculations note the rough square footage appromixations based on different construction: (Again, this is heat related, but the concept is the same)
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Forty btuh per square foot was useful in the 1960's when 2 inches of insulation was applied to walls and 2 to 6 inches of fiberglass in the ceilings. An uninsulated house of the 1940's could be estimated at 80 btuh per square foot; but anyone who puts a warm air system in an uninsulated house is looking for lawsuits today. Today's homes since 1992 require about 25 btuh per square foot, so can be heated by radiant floors which can reliably provide that little heat requirement.
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Okay so what about AC? Here is a website with a few questions and an easy calculator to answer that for you: http://store.portableairshop.com/portabl... I ran the calculator and for a portable unit the range was (depending on number of persons using the room and environmental issues) 12000 to 18000 BTUs.
It would be a unit 12,600BTU's to cool that room
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