Hvac tonnage chart

Let’s use the CFM calculation formula to see if we get the same number (this is the very formula used in the calculator): CFM = (Area x Height x ACH) / 60. If we input the figures from our example, we get: CFM = (1,000 sq ft * 8 ft * 4) / 60 min = 533 ft3/min = 533 CFM. In short, we get the same number.

Tonnage: In reference to air conditioning, a ton measures how much heat removed by the system would be needed to melt 2,000 pounds, or one ton, of ice in a 24-hour period. The result is then expressed in BTUs per hour. According to the standard calculation, it takes 288,000 BTUs to melt a ton of ice in 24 hours, or 12,000 BTUs per hour.Since most air conditioning units are provided in increments of ½ a ton (6,000 BTU/hour) sizes, this system should be quite close to the actual units that will be used. Note: This HVAC calculator is provided strictly as a quick method of computing general size and value conditions. Square foot methods are considered rule of thumb for use in ...The British Thermal Unit, or BTU, is an energy unit. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. 1 watt is approximately 3.412 BTU per hour. BTU is often used as a point of reference for comparing ...Calculate the square footage of each room by multiplying the width by the height. Add up the square footage of each room to get the total square footage served by the HVAC system. Multiply that figure by 20 to get the base BTU load requirement. Divide the BTU load requirement by 12 to get the tonnage. Given the above example, let's imagine you ...1. Calculate the CFM for Each Room. Most HVAC units are designed to have a 400 CFM of airflow for every 12000 BTU or 1 ton of cooling capacity and 12000 BTU divided by 400 CFM is 30. So, identify the BTU needed for each room and divide it by 30 to get the required CFM for the respective room.

Air Conditioner BTU Chart. The chart below is a great starting point for sizing your AC. These BTU calculations are based on a standard room with 8-foot ceilings, two windows and one door. If the room has more windows, doors or higher ceilings, adjust the BTUs upward. Other factors in determining the BTU size would be the room’s purpose.HVAC design tools include such popular items as the Trane Ductulator™, psychrometric charts, and load estimating forms. Learn more about the order process here . Ductulator - Hand held rotating calculator used for sizing supply and return duct systems using the equal friction design method.Calculation: 4 x 12,000 = 48,000 BTU. The case when you have BTUs and want to convert them to tons: Number of BTUs / 12,000 = Tons. Example: You have a 12,000 BTU portable air conditioner. Calculation: 12,000 / 12,000 = 1 ton. You have to convert BTU to tons in a number of situations regarding cooling and heating.One ton represents 12000 BTU mini split, one and a half tons equals 18000, two tons equals 24000, and so on. This makes sizing and consumer expectations easily understood. Much is made of the problems encountered by homeowners if mistakes are made by either over-sizing or under-sizing AC and heating systems-particularly mini split systems, as ...If you follow these steps, you should have the ideal chiller size for your needs. Here’s an example of the formula in action: Scenario: What size chiller is required to cool 40GPM from 70°F to 58°F??T°F = 70°F – 58°F = 12°F; BTU/hr. = 40gpm x 60 x 8.33 x 12°F = 239,904 BTU/hr. Ton Capacity = 239,904 BTU/hr. ÷ 12,000 = 19.992 Tons

Here is how we can calculate how many kW you would need for this flat: Air Conditioner kW Capacity = 100 m 2 × 0.065 kW per m 2 × 1.12 (ceiling height correction) × 1 (average climate) × 1.1 (very sunny correction) + 1.2 kW (kitchen included) = 9.2 kW. For this 100 m 2 flat, you would need about 9.2 kW of cooling output.The British Thermal Unit, or BTU, is an energy unit. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. 1 BTU = 1,055 joules, 252 calories, …36 = 36,000 BTU = 3.0 tons; 42 = 42,000 BTU = 3.5 tons; 48 = 48,000 BTU = 4.0 tons; 60 = 60,000 BTU = 5.0 tons; All characters and what they represent: Character 1: This is the refrigerant type, and 4 stands for R410A refrigerant. If your unit is older, it might start with 2, which represents R22 refrigerant, which is no longer used in new ACs.Learn how to calculate the amount of AC tonnage required for a room with our Tonnage Calculator. Try it now and make a smart decision.This air conditioner size calculator, also known as an AC tonnage calculator, helps you choose the right size air conditioner for your room. It takes into account factors such as room size, city of use, number of people, and number of appliances in the room to recommend the appropriate AC size in tons. Use a tape measure to determine the …

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Oct 15, 2023 · An air conditioner tonnage calculator is a useful tool for homeowners and contractors to accurately determine the size of the air conditioning unit that is needed for any given space. This helps ensure that the correct unit size is purchased, which in turn can help save money on energy bills by avoiding over or under-sizing an AC unit. Split AC; Light Commercial Air Conditioner; Industrial HVAC; Upcoming; Mobile. Smart Phone; Feature Phone; Accessories; ... BTU Calculator ... Step 4; Step 5; Step 6; Step 7; Result; Room Size (রুমের সাইজ স্কয়ার ফিটে) 0-90 sf. 91-120 sf. 121-144 sf. 145-180 sf. 181-220 sf. 221-250 sf.29 Apr 2020 ... AC Tonnage. What is AC tonnage? AC tonnage ... AC BTU Calculator Chart. How many BTUs do you ... Heat Zone HVAC Calculator. Throughout the world ...22 Apr 2024 ... So for a 1,000-square-foot house needs 25,000 BTUs. But HVAC units are sold by the ton? One ton can remove 12,000 BTUs in an hour. So your 1,000 ...If you follow these steps, you should have the ideal chiller size for your needs. Here’s an example of the formula in action: Scenario: What size chiller is required to cool 40GPM from 70°F to 58°F??T°F = 70°F – 58°F = 12°F; BTU/hr. = 40gpm x 60 x 8.33 x 12°F = 239,904 BTU/hr. Ton Capacity = 239,904 BTU/hr. ÷ 12,000 = 19.992 Tons

This information supports our PickHVAC AC BTU calculator that gives you guidance on how many BTUs your air conditioner should be. There is a room size chart to assist in choosing the right size air conditioner. Window air conditioners range from 5,000 to 24,000 BTUs in most brands (a few are a little larger) Portable air conditioners are ...36 = 36,000 BTU = 3.0 tons; 42 = 42,000 BTU = 3.5 tons; 48 = 48,000 BTU = 4.0 tons; 60 = 60,000 BTU = 5.0 tons; All characters and what they represent: Character 1: This is the refrigerant type, and 4 stands for R410A refrigerant. If your unit is older, it might start with 2, which represents R22 refrigerant, which is no longer used in new ACs.Refrigerant (R-410A) Piping Guide for Freon™ 410A (ENG Units) Technical Information Suction Line Size—Evaporator to Compressor 50 °F through 30 °F (145 through 99 psig) 29 °F through 10 °F (97 through 64 psig) 9 °F through –10 °F (62 through 38 psig) Suggested Allowable Pressure Drop in psig = 2 °F 4.6 lb (2 °F) 3.5 lb (2 °F) 2.5 ...First, find the square footage of your room and then check its corresponding BTU requirements. This chart is only a starting point, though, and you should not base your purchase decision on this information alone. For a more precise estimate, you can use our HVAC sizing calculator. The most accurate method of sizing is with a professional …Explore the website of Mitsubishi Electric India Pvt. Ltd. an electrical & electronic equipment company offering a wide range of products and solutions for Air Conditioners, Factory Automation,CNC, Semiconductors & Railway productsAir Conditioner BTU Chart. The chart below is a great starting point for sizing your AC. These BTU calculations are based on a standard room with 8-foot ceilings, two windows and one door. If the room has more windows, doors or higher ceilings, adjust the BTUs upward. Other factors in determining the BTU size would be the room’s purpose.The size of air conditioner you need depends primarily on your home’s square footage. Measure the square footage of each room. Measure the length and width of each room in your home. Multiply those numbers together to determine the room’s square footage. Calculate your home’s total square footage.Jul 22, 2022 · 1,000 - 1,200 sq. ft. small home, 3-4 bdrm apartment. 24,000 BTU. 1,400 - 1,500 sq. ft. medium home, 4-bdrm apartment. 30,000 BTU. 1500 - 1700 sq. ft. medium home, 4-bdrm apartment. Now, let’s discuss how this table will help you choose the right size air conditioner for the room or zone you want it to serve.

Cooling size is given in tons of cooling; 1 ton = 12,000 Btu/h. ... 'SEER' (Seasonal Energy Efficiency Ratio) indicates the efficiency of the air conditioning ...

AC Tonnage Calculator accurately estimates the proper Central AC size in TONs & BTUs, as well as the cost to install your Central Air system in different climate zones, based on your house size & AC …Oct 15, 2023 · An air conditioner tonnage calculator is a useful tool for homeowners and contractors to accurately determine the size of the air conditioning unit that is needed for any given space. This helps ensure that the correct unit size is purchased, which in turn can help save money on energy bills by avoiding over or under-sizing an AC unit. Within the string, you should see an even, two-digit number. Add three zeroes to the number and you have the BTU rating. Divide the two-digit number by 12, and you have the tonnage. Here are some examples: 12 = 12,000 BTU or 1 ton. 18 = 18,000 BTU or 1.5 tons. 24 = 24,000 BTU or 2 tons. 30 = 30,000 BTU or 2.5 tons.Visiting HVAC events and trade shows are one of the best way to equip yourself with the latest happenings in the air conditioning and refrigeration field. See the listing of events... 2301 - 2700 sf. 5 Tons. 2401 - 3000 sf. 2501 - 3100 sf. 2601 - 3200 sf. 2751 - 3300 sf. 2701 - 3300 sf. Did you know that you can get big discounts on Goodman and Ruud air conditioning systems? Shop online or by phone and get FREE shipping. If you need to know the proper ton rating, divide the BTUs by 12,000. Central Air Conditioner Sizing by Home Size. If you already know your home's square ...Residential air conditioners usually range from 1.5 to 5 tons (or, 18,000 – 60,000 BTUh). Anything with larger cooling capacity would be considered light commercial. Tonnage …hvac heat load calculation formula latent heat formula hvac hvac tonnage calculator chart furnace size calculator ac unit for house cooling capacity air ...Therefore P=650* 4² *3/4*8=975 (KN) = 99.5 (Ton) The result obtained using the bending force formula is very similar to the data in the bending force chart. Note that method #1 to calculate the press brake tonnage is based on mild steel material.Calculation: 4 x 12,000 = 48,000 BTU. The case when you have BTUs and want to convert them to tons: Number of BTUs / 12,000 = Tons. Example: You have a 12,000 BTU portable air conditioner. Calculation: 12,000 / 12,000 = 1 ton. You have to convert BTU to tons in a number of situations regarding cooling and heating.

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This air conditioner size calculator, also known as an AC Tonnage calculator, air conditioner size calculator helps you to choose what size of air conditioner, so By using the existing heating/cooling ducts that encompass the entire home. Of course, the choice of brand and air conditioner type still depends on you. A “ton” of cooling capacity equals 12000 BTUs per hour; thus 1-ton AC units have 12000 BTUs/hr and 2-Ton AC Units have 24000BTUs/hr. To determine how many tons you need for your HVAC system in total, you must multiply the square footage of your home by 25 (the approximate amount of heating/cooling required per square foot).Bard's Two Ton Air Conditioner is a self contained energy efficient heating and cooling system, which is designed to offer maximum indoor comfort at a ...(Tonnage Per Square Foot) Simple answer: You need 0.0016 tons of AC per square foot. In short, if you’re looking to cool down a 600 sq ft area, you would need: AC Capacity = 600 sq ft * 0.0016 tons/sq ft = 1 Ton. In general, for every 600 sq ft, you need 1 ton of AC. This is a general estimate.A BTU is what's required to heat or cool one pound of water by 1 degree Fahrenheit. For example, your home's square footage total, including all floors and ceilings, is what determines what size what size HVAC unit you need. For every 500 BTUs required for your home, you will need approximately one ton of air conditioning or heating capacity (1 ...Step 1: Measure the Room The first step is to measure the dimensions of your room. Use a measuring tape to accurately determine the length, width, and height of the room. Multiply the three measurements to obtain the total volume in cubic feet (ft³). Example: Let’s say your room measures 15 feet in length, 12 feet in width, and 10 feet in ...There are 12,000 Btu's per ton. The number 24 in the model number indicates the unit is 24,000 Btu's, divided by 12,000 Btu's per ton, equals 2 tons. 24,000 Btu's/ 12,000 Btu's per ton = 2 tons. Use the following conversion information to determine your existing system size (use the system model number NOT the serial number) AC Direct Pricing.During the heating season, a BTU denotes how much warmth it can add to the room in that same hour. So, when we talk about an AC unit rated at 1, 2, or 3 tons, it just means the required amount of BTU needed. For example, a 3 ton air conditioning unit has 36,000 BTU/hr, and a 5-ton air conditioning unit has 60,000 BTU/hr.The CFM Per Ton Calculator provides a convenient way to compute this value by entering the total CFM and total tonnage of cooling. It helps HVAC professionals and technicians ensure proper airflow in cooling systems, which is essential for maintaining optimal temperature and comfort levels in various spaces such as homes, offices, and ... The British Thermal Unit, or BTU, is an energy unit. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. 1 watt is approximately 3.412 BTU per hour. BTU is often used as a point of reference for comparing ... Tonnage = 60,000 BTUs / 12,000 = 5 tons. So, you would need an air conditioning unit with a capacity of 5 tons to adequately cool this room. FAQs. Q1. What is the relationship between BTUs and tonnage? A1. One ton of cooling capacity is equivalent to 12,000 BTUs per hour. To find the required tonnage, divide the total BTUs by 12,000. Q2. An air conditioner tonnage calculator is a useful tool for homeowners and contractors to accurately determine the size of the air conditioning unit that is needed for any given space. This helps ensure that the correct unit size is purchased, which in turn can help save money on energy bills by avoiding over or under-sizing an AC unit. ….

In the AC tonnage chart method, first of all, you need to calculate the area of your room by multiplying the length and width of the room in feet. After that, check the below AC tonnage chart for its corresponding base AC capacity in BTU and Tons. Room Area (sq. ft) AC capacity in BTU: AC Tonnage: 100-150: 5000: 0.50 Tons: 150-250: 6000:A 1.5 ton AC covers how many square feet? Again, using the chart above, locate 1.5 Ton in the left column to find the answer. A 1.5 ton central AC, mini split or even a large window unit will effectively cool and dehumidify up to 825 square feet. AC Sizing Tip: It is crucial that you get the right size/capacity air conditioning system for your ...Apr 20, 2023 · An air conditioner generally needs about 20 BTU per square foot of living space. Once you've calculated the square footage of the room or home, multiply the result by 20 to find the air conditioner size for the home. For example, if the square footage of the home is 2,000 square feet, you can find the right air conditioner size by multiplying ... (Tonnage Per Square Foot) Simple answer: You need 0.0016 tons of AC per square foot. In short, if you’re looking to cool down a 600 sq ft area, you would need: AC Capacity = 600 sq ft * 0.0016 tons/sq ft = 1 Ton. In general, for every 600 sq ft, you need 1 ton of AC. This is a general estimate.AN HVAC LOAD CALCULATOR THAT’S ACTUALLY FUN TO USE. For ages 8 to 80. How to perform an HVAC load calculation. Watch video. ... For example, a load calculation may call for a three-ton unit at 95-degree outdoor temperature, however, 97% of the time it is less than 95 degrees outdoors. A practical solution is to slightly undersize the unit but ...Since most air conditioning units are provided in increments of ½ a ton (6,000 BTU/hour) sizes, this system should be quite close to the actual units that will be used. Note: This HVAC calculator is provided strictly as a quick method of computing general size and value conditions. Square foot methods are considered rule of thumb for use in ...A 1.5 Ton system is the smallest central air conditioning size you’ll come across. Air conditioner sizes are as follows: 18,000 BTUs – 1.5 Tons; 24,000 BTUs – 2 Tons; 30,000 BTUs – 2.5 Tons; ... This Florida AC sizing chart can help you better understand the size of the air conditioner that’s right for your home. It’s not anywhere ...How To Use Our AC Tonnage Calculator. Simply input the estimated square footage of your home into the calculator and click “Calculate.”. Our tool will provide you with the recommended air conditioning unit size, taking into account energy efficiency and optimal cooling capacity. By following these personalized recommendations, you can ... Hvac tonnage chart, service technicians to demonstrate how to size refrigerant piping. Using This Guide This Guide covers R-22, R-407C, R-410A, and R-134a used in commercial air conditioning systems. It does not apply to industrial refrigeration and/or Variable RefrigerantVolume (VRV) systems. Illustrations and figures are not to scale., To estimate the air conditioner size you'd need to cool a specific room: Measure the square footage or area in square meters of the room. For that, multiply its …, 1. Calculate the CFM for Each Room. Most HVAC units are designed to have a 400 CFM of airflow for every 12000 BTU or 1 ton of cooling capacity and 12000 BTU divided by 400 CFM is 30. So, identify the BTU needed for each room and divide it by 30 to get the required CFM for the respective room., Typical Cost To Install Central AC Average: $4,070 - $5,930. See costs in your area. This HVAC Heat Load Calculator will help you estimate proper system size in BTUs/h, base on simplified Manual-J method, that accounts for your home size, heat loss, geographic/regional adjustments, etc., to give you a pretty accurate size of you …, Air Conditioner BTU Chart. We have also calculated air conditioner BTUs for 100 sq ft, 150 sq ft, 200 sq ft, and up to 3,000 sq ft rooms/homes, based on the AC BTU sizing rule of …, The steps HVAC professionals take to choose A/C size for mobile homes using the ENERGY STAR guide include: Determine the square footage of the mobile home where the air conditioning unit will be installed. Find the county where the home is located on the guide's map. This will give you a sizing group number. Find the sizing number on …, The main factor is the size of the room. Room Size. The size of the room is the main factor in choosing a window air conditioner size. A larger room will naturally require more energy to cool and more airflow in CFM than a smaller room. Window AC Size Chart. The chart below from Energy Star shows how many BTUs are needed for a given room size., HVAC design tools include such popular items as the Trane Ductulator™, psychrometric charts, and load estimating forms. Learn more about the order process here . Ductulator - Hand held rotating calculator used for sizing supply and return duct systems using the equal friction design method., What is the proper size HVAC system for my home? Sizing the equipment load requires the consideration of several factors. Ceiling height, construction, window size and placement and dozens of other variables all need to be considered to properly size a heating and/or cooling system. A professionally conducted load calculation is the foundation ..., The capacity in tons of a Trane outdoor unit can be determined by dividing the 7th and 8th digit of the model number by 12. So if the model number is #4TTX4036A1000AA, take 36 and divide by 12, equaling 3 tons. Lets decode the trane model number from the example above: First letter. The model number starts with 4., 13 Dec 2023 ... Under normal circumstances, the ideal room size for a 2 ton AC should be around 175 square feet to 250 square feet. But, again, a lot depends on ..., Choose an AC of 3 Tonnage. AC Tonnage Chart Method. In the AC tonnage chart method, first of all, you need to calculate the area of your room by multiplying the length and width of the room in feet. After that, check the below AC tonnage chart for its corresponding base AC capacity in BTU and Tons, To really size the HVAC properly you have to do a heat load calc. Using xyx ton/sq ft would only get you into the realm of what size you have, ..., This AC BTU calculator is the first step in getting the right size central air conditioning system to make your home comfortable – the right temperature and perfect humidity. Central AC Sizes. AC capacity is measured in BTUs – actually BTU/hour, or the number of BTUs the unit moves in one hour of running., The CFM Per Ton Calculator provides a convenient way to compute this value by entering the total CFM and total tonnage of cooling. It helps HVAC professionals and technicians ensure proper airflow in cooling systems, which is essential for maintaining optimal temperature and comfort levels in various spaces such as homes, offices, and ..., heat pump tonnage calculator; Choosing the Right Calculator. When selecting a heat pump size calculator, be sure to choose one that is reputable and reliable. Many manufacturers and HVAC professionals offer online calculators to help with sizing, but it’s important to use one that considers your specific climate conditions and other factors., The minimum SEER allowed for a new split system central air conditioner in the U.S. today is 14, which is at least 20 percent more efficient than minimum-efficiency models made even 10 years ago ..., Here is how we can calculate how many kW you would need for this flat: Air Conditioner kW Capacity = 100 m 2 × 0.065 kW per m 2 × 1.12 (ceiling height correction) × 1 (average climate) × 1.1 (very sunny correction) + 1.2 kW (kitchen included) = 9.2 kW. For this 100 m 2 flat, you would need about 9.2 kW of cooling output., By using this equation, we can determine the size of the return grille we need for 400 CFM airflow like this: Grille Area (400 CFM) = 400 CFM ÷ 500 FPM ÷ 0.7 × 144 = 164 Sq In. That means we will need a grill with at least 164 square inches of area to accommodate for a 400 CFM airflow. 10×10 grille, for example, has a 100 sq in area; it ..., Locate the second set of numbers within the larger M/N number (the numbers after the first dash, characters 6-8). This number indicates the BTUs/ hour of the unit. For example, 024 equals 24,000 BTUs. Divide the BTUs by 12,000 (one ton). This number will equal the tonnage of the AC unit. In this example, the unit is a two-ton unit (24,000 ... , Anything with larger cooling capacity would be considered light commercial. Tonnage ratings are typically expressed in increments of .5 tons, so residential air conditioners are usually rated as 1.5, 2, 2.5, 3, 3.5, 4, 4.5 or 5 ton units. It should be noted that there is a distinct difference between BTU and BTUh., If you follow these steps, you should have the ideal chiller size for your needs. Here’s an example of the formula in action: Scenario: What size chiller is required to cool 40GPM from 70°F to 58°F??T°F = 70°F – 58°F = 12°F; BTU/hr. = 40gpm x 60 x 8.33 x 12°F = 239,904 BTU/hr. Ton Capacity = 239,904 BTU/hr. ÷ 12,000 = 19.992 Tons, Now that we have the adequate BTU per sq ft estimate, we can calculate BTU for this room size like this: Air Conditioner BTU (400 Sq Ft) = 400 Sq Ft × 26.5 BTU Per Sq Ft = 10,600 BTU. We can see that we would need about 10,600 BTU to adequately cool this 400 sq ft room. In practice, we would install an 11,000 BTU or 12,000 BTU portable or ..., 48,000 BTUs. 2,500 square feet. 5 tons. 60,000 BTUs. 3,000 square feet. 6 tons. 72,000 BTUs. Once you know the appropriate number of BTUs required for your home's heat pump, you can start shopping ..., An important step in shopping for your new heating and cooling system is properly sizing your HVAC equipment. For the right cost and energy efficiency, your air conditioner and heater need the right tonnage, SEER and BTU heating output. Too big of a system is inefficient while too small will put unnecessary strain on your system., 4 May 2023 ... Air Conditioning Sizing Chart ... As noted above, the size of your home is a major factor in making sure you get the right size AC unit. The most ..., 3.5 Ton - 5.0 Ton. AC/Gas Heat. 1.5 Ton - 2.0 Ton. 2.5 Ton - 3.0 Ton. 3.5 Ton - 5.0 Ton. Ultra Low NOx For California. Low NOx For California. AC/Heat Pump. 1.5 Ton - 2.0 …, AC Calculator. Size matters. And when it comes to choosing an AC there’s no such thing as one size fits all. Taqeef’s AC calculator gives you a quick guide to choosing the right AC for your space. Welcome to interactive presentation, created with Publuu. Enjoy the reading!, Our free, easy-to-use HVAC load calculator will help you determine the necessary thermal output capacity (in BTUs) of any residential building., service technicians to demonstrate how to size refrigerant piping. Using This Guide This Guide covers R-22, R-407C, R-410A, and R-134a used in commercial air conditioning systems. It does not apply to industrial refrigeration and/or Variable RefrigerantVolume (VRV) systems. Illustrations and figures are not to scale. , AC Tonnage Chart. If you know the height of your room ceiling, you can get an even more accurate idea of the AC tonnage that you need with online AC tonnage calculators. It doesn’t even matter whether you’re looking for a window or split AC ton calculator. You can use any but this AC capacity calculator from Carrier is particularly useful:, Free AC Sizing calculator. If you’re wondering “What size air conditioner do I need?” This BTU and AC tonnage calculator can help. *Super easy* to use based on your climate and insulation factors. , Though BTUs are important, most larger air conditioning units are rated in tons. Since 12,000 BTUs equal 1 ton, an air conditioning unit rated at 3 tons can produce 36,000 BTUs. Step 1: Calculate the square footage of the area to be cooled. Figure out if the office space will be divided into zones that cooled by separate air conditioning units.