I live in Southern California.. For example, a 2,200 sq.ft. house. Here are unit prices for different tonnage (prices do not include installation): 2 ton AC unit costs $1,700 – $2,200 Whereas modern cenral air units have an average rating of 16 SEER (seasonal energy efficiency rating), a typical ductless mini split has a SEER rating of 22, while high – end models are rated at 33-40 SEER, in single zone installations. One ton is 12,000 BTU. (600 sq.ft./1 ton). Shop MRCOOL 24000-BTU 230-Volt 9.5 SEER 2-Ton 1000-sq ft Smart Ductless Mini Split Air Conditioner with Heater in the Ductless Mini Splits department at Lowe's.com. So you would want to install a 3.5 ton unit. It is recommended to use this method if you are planning to replace the ductwork in addition to the AC unit. This means that your house requires a central air conditioning unit of 5 to 5.5 tons. This means that if your house requires a 24,000 BTU unit (2 tons), you should not install one that is larger than 30,000 BTU’s (3 tons) to maintain energy efficiency. In the example above, you would estimate a 4 ton unit for a poorly insulated 2,200 sq.ft. That’s it! A 1,600-square-foot home will generally require a 3-ton air conditioning unit. A four-ton heat pump is rated at 48,000 BTU per hour. When buying an AC in India the most important question that many consumers have in mind is how much ton AC should they buy and whether the AC will be sufficiently enough keep the room cool.If you ask this question to the salesman most probably they will try to sell you the maximum ton AC, which in fact will be more than required to cool the room. A newer 2 ton air conditioner effectively cools the upstairs. In older homes, many factors will skew this estimate, and you may require a larger ac unit size to cool your house, depending on the factors we will discuss. I am questioning whether the total tonage is enough for this spread out square footage. Besides flexibility, mini split systems offer a far superior energy efficiency compared to central AC systems. Consequently, AC sizing involves determining the home’s cooling load: the exact capacity in BTUs per hour and cubic feet per minute of airflow required to maintain a 78 degree temperature in the house. This estimate is most accurate in new construction or newer homes that have proper insulation. 18,000 BTUs – 1.5 tons Why? Two installers went into the attic and suggested 4 Ton units like I already had. Easy To Use A/C Size Selection Tool: Check the color coded map above and confirm the zone your home is in. – number of heat generating appliances Pro Tip: In general, you should have approximately 1 ton of ac capacity to cool 600 sq.ft. The cooling capability of a central air conditioning units is measured in tonnage. What do you mean by 1.5-ton air conditioner? Instead of subtracting 0.5, you will need to ADD it. When we remodeled 28 yr’s ago we added a den, bed room and bath. I need to replace an old 3 ton air conditioning unit that cools first floor. The importance of a quality install cannot be overstated enough. Total number of square feet is just one of these factors. Also keep in mind, that it’s much more “efficient” to fix air leaks, insulate, etc., than to oversize your HVAC system. The smallest unit is 18,000 BTUs (1.5 tons), while the largest is 60,000 BTUs (5 tons). According to this common but somewhat inaccurate method, you need 1 ton of air cooling capacity for every so many square feet of living space. An air conditioner or furnace unit that’s too small won’t cool or warm your house properly, and a unit that’s too big will cost more than necessary. Use the following equation: ((House sq.ft. This is a huge mistake, as the current unit that is being replaced may not be the right efficiency for your house. Amount of sunshine your home gets: you may have very bright, hot rooms that get a lot of sun, as well as darker, naturally coolers rooms where the sun does not come in a lot. Manufacturers use a code in the model number of outdoor units instead of listing unit capacity on the air conditioner. For example, model GSX140241K is a 2 ton unit. Don’t settle for a ball park estimate based on a quick visual assessment, as it will not be accurate. You will be able to determine the tonnage and size needed of a central air system to cool off the entire house. I don’t remember the R-Rating but it was quite a bit higher then required. If the house does not have a ductwork system, the cost of installing central air will skyrocket to as much as $8,000-10,000+. If you need an AC that small, you are much better off going with a ductless mini-split system. AC Size Calculator | Estimate Size Of AC Unit For Your Home, get free estimates from licensed HVAC installers, mini split AC system can be installed DIY, Number of people living in the house: (each person gives off around 250 BTUs per hour), Number, age and orientation of windows (south or north facing) and how well they are insulated. It does not take into consideration any of the specific factors that can really impact AC size needed for a particular house. x 25) / 12,000) – 0.5) = required tons, For example: your house is 2,350 sq.ft. feet or better say total 400 , one bedroom , bath ,8 feet long kitchen, small living room and small dining room , and i have a 10, 000 b t u in the wall a/c and it is more than enough , at night i turn up my a/c to 70 degrees and the speed fan to # 2 , this is after being on 60 % of the day at 64 degrees, so you are going to need … AC Size Calculator accurately estimates the cost to install central air in different climate zones (regions), based on your house size and AC SEER rating. Even if you get the most efficient ac unit, these savings will be nullified if you have a poorly functioning duct system. 1.91 Ton is for 23000 Btu. On the other hand, installing a central AC that is too small will not keep your house cool! 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