Hvac tonnage chart

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 ...

Hvac tonnage chart. 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 …

Mar 26, 2024 · Air Conditioning Sizing Chart by Total Square Footage. Central Air Conditioner Sizing Chart for Homes by Total Square Footage. Air Conditioner Sizing Chart for Houses by No. of Bedroom. Air Conditioner Sizing Chart for Apartments by No. of Bedroom. Room Air Conditioner Sizing Chart for Garages by No. of Car.

Dec 13, 2023 · The Chiller Tonnage Calculator is a vital tool used in the HVAC (Heating, Ventilation, and Air Conditioning) industry to determine the cooling capacity required for a particular system. It calculates the necessary tonnage of refrigeration needed to effectively cool a space or system based on specific inputs. Size of the HVAC system (1.5 to 5.0 tons) Rating of the blower in CFM (Most are 350-400 CFM per ton) Square foot of the space served by the HVAC system; The equation is: Tonnage x CFM of the blower / Number of square feet. Example: 4-ton AC x 400 CFM blower / 2,000 square feet = 0.8 CFM per square foot. A room that is 200 …A ton of refrigeration or refrigeration ton (symbol: TR or TOR) is another unit of power. One ton of refrigeration is equal to heat transfer which resulted in the consumption of one ton (or 2000 lb) of pure ice at 0 °C (32 °F) per day.. In the USA, the thermal capacity of air conditioning and refrigeration equipment is often specified in …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.Air Conditioning Sizing Chart by Total Square Footage. Central Air Conditioner Sizing Chart for Homes by Total Square Footage. Air Conditioner Sizing …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 TonsEdited by M.J. Davis Lin , Brendan Klinkenberg and Lisa Chow. Original music by Diane Wong , Marion Lozano and Dan Powell. Engineered by Alyssa Moxley. Donald …

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 …Copeland's Refrigerant Charge Calculator in a few points: Tool to support the calculation of the maximum possible refrigerant charge of A2L refrigerants, according to safety standard EN 378-1. For any type of refrigeration system and refrigerant type, the system designer has a general requirement to carry out a risk assessment.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.Region 1 Region 2 Region 3 Region 4 Region 5 Condenser Size ... 2810-3375 2645-3175 2500-3000 2045-2455 2045-2455 4.0 TON 3375-3935 3175-3705 3000-3500 2455-2860 2455-2860 5.0 TON Residential Sizing: The table and charts are intended to be used as a guideline for Residential applications only. ... AC Sizing Guide.xlsIn 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:Apr 10, 2024 · We can use tonnage to describe the sizing of an HVAC system or how much a ship weighs. Basically, tonnage is the weight in tonnes (or tons for short) of massive volume objects, such as the contents of a cargo ship or earthworks like rocks and gravels. This calculator focuses on the latter, particularly the different aggregates used in ...

The HVAC systems analyzed in this calculator include (1) split systems/packaged A/C, (2) air cooled chilled water systems and (3) water cooled chilled water systems. This will help you to select equipment, space plan for any mechanical rooms and …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.The size (cooling capacity) of your air conditioner is measured in BTU (British thermal unit) and tons (12,000 BTU = 1 ton). How much cooling capacity should your air conditioner …Whether you have an established HVAC business or you're just getting started, our HVAC s list will help ensure you have everything you need. Selecting the right tools for HVAC is e...

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In search of the right Air Conditioner room size calculator? Remember, when it comes to AC room size calculators, tonnage is the most crucial factor to consider. A ‘ton’ refers to the heat capacity of a ton of melting ice over one day. This means that a 1.5 ton air conditioner can remove enough heat that can melt 1.5 tons of ice in a day.up to 2.5 ton. 2.5 to 3 ton. 2500 to 3500 sq ft. 80,000 to 90,000 BTU/hr. 90,000 to 100,000 BTU/hr. 3 to 3.5 ton. 3.5 to 4 ton. * The above square footages do not include the area of the basement. Furnace and Air Conditioner HVAC size for a semi-detached 2-storey home.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 ...Next. Enter Room Size (in feet) Back. Next. Enter Area of Windows (in square feet) Back. Next. Is your floor Basement or Ground Floor First or Higher Floor.Here’s the calculation: Mini-Split Heat Pump Size (1,500 sq ft) = 1,500 sq ft * 30 BTU per sq ft = 45,000 BTU. For a 1,500 sq ft home, you would need about 45,000 BTU heat pump. Let’s convert that to tons and kWs; that’s 3.75 tons (about 4 tons) and about 13 kW.

The HVAC systems analyzed in this calculator include (1) split systems/packaged A/C, (2) air cooled chilled water systems and (3) water cooled chilled water systems. This will help you to select equipment, space plan for any mechanical rooms and …Jun 17, 2023 · As a general rule, an air conditioner needs 20 Btu for each square foot of living space. But other considerations, such as the ceiling height and the size of your windows and doorways, might call ... Air Conditioning Sizing Chart by Total Square Footage. Central Air Conditioner Sizing Chart for Homes by Total Square Footage. Air Conditioner Sizing …HVAC units are identified by their multiple-character model number that identifies a particular type of unit. Below you will find a partial explanation of the alphanumeric identification code (aka Model Number Nomenclature). ... Tonnage, Air Flow, kW, etc. are located within the oval/round shaped buttons). Thank-You For Sharing. ACNF** Unit ...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: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:This calculator assists homeowners, HVAC professionals, and anyone in need of efficient temperature control. Formula: The tonnage of a heat pump is calculated based on the area of the space it needs to heat or cool. The formula for determining the required tonnage is as follows: Tonnage = (Area in square feet × Heating or Cooling Load factor ...For example, a filter labeled 10” X 12” X 1” is 10 inches long, 12 inches wide, and one inch thick.Here’s a look at some common filter dimensions. 10 X 20 X 1’’. 14 X 20 X 1’’. 16 X 24 X 1’’. 18 X 30 X 1”. A filter’s advertised size is slightly bigger than its exact measurements. If you know how these two sizes relate ...In case you know the power in watts but want to know how many BTUs it is equivalent to, you would only have to multiply the power in BTUs by 3.412. 1 Watt = 3.412 BTU/hour. You will often find that thermal power is expressed in kilowatts (kW). 1 kilowatt equals 1000 watts. Thus, an air conditioning system requiring 2322 W will be equivalent to ...BTU stands for British thermal unit, and there are 12,000 BTUs per one ton of AC capacity. Air conditioning units remove BTUs from the atmosphere. For example, if you see an air conditioning unit rated for two tons, it can remove 24,000 BTUs from the air. More tonnage equals a higher rating, which indicates a larger cooling capacity.An AC ton calculator is a tool used to determine the appropriate size or capacity of an air conditioning unit (AC) for a given space. It calculates the required tonnage based on factors such as the square footage of the area, insulation levels, number of windows and doors, and the climate of the region. The tonnage refers to the amount of heat ...

An AC ton calculator is a tool used to determine the appropriate size or capacity of an air conditioning unit (AC) for a given space. It calculates the required tonnage based on factors such as the square footage of the area, insulation levels, number of windows and doors, and the climate of the region. The tonnage refers to the amount of heat ...

HVAC Design Tools. 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.$4,070. Average. $4,920. High. $5,930. See costs in your area. HVAC Load Calculator provides an accurate real world heat load estimate for both heating & cooling.By dividing your square footage by 12,000, you can choose a 4 or 4.5-ton AC unit for a home over 2,500 square feet in size. Window air conditioning units typically have cooling capacities that ...AC Tonnage: It takes one ton of heat to remove 288,000 Btus from the air in a day. That’s the amount of Btus that must be removed to melt one ton of ice over 24 hours. Thus, a one-ton AC unit would be rated 12,000 Btus per hour. The total square feet in a home is the primary factor involved in calculating which AC is best.refrigerant system charge as well as extra copper cost. h) It is worth repeating that the connection on a compressor service valve, the size of the connection on a condenser, evaporator, accumulator or any other component found in the system does not determine the size of the refrigeration line connected to the component.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.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:The table on the right (or below if you’re viewing on a phone) shows the return duct size for HVAC unit from 1.5 tons to 5 tons. Based on 400 CFM per ton, the corresponding airflow is also provided. The next column is the diameter (in inch) for ROUND RIGID duct. The last column is the number of round rigid duct you need.Most homes need ACs that range from 18,000 to 60,000 BTUs. Sometimes you’ll see air conditioner size measured in tons instead of BTUs. Tonnage is just another way of expressing an air conditioner’s cooling performance. Below is an AC sizing chart to help you compare tonnage with BTU output: 1 ton = 12,000 BTUs.

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The direct to consumer AC company in Florida. Miami 8350 NW 52nd Terrace, Suite 301-1018 Miami, FL 33166 Phone: 305-363-6303 Orlando 2212 S Chickasaw Trl, Orlando, FL 32825Size of the HVAC system (1.5 to 5.0 tons) Rating of the blower in CFM (Most are 350-400 CFM per ton) Square foot of the space served by the HVAC system; The equation is: Tonnage x CFM of the blower / Number of square feet. Example: 4-ton AC x 400 CFM blower / 2,000 square feet = 0.8 CFM per square foot. A room that is 200 …Less than 300 tons the full load efficiency value is 0.634 kW/ton, 300-600 tons – 0.576 kW/ton and >600 – 0.570 kW/ton. Since all the compressor types can have a cooling load less than 300 tons, the worst case full load efficiency is used. Absorption chillers are not included in this calculator.Choosing the right sized air conditioner can be as easy as using a tape measure and a little mathematics. Simply measure the length and width of a room and figure the square footage. Let's say it is a 10 foot by 15-foot room. Multiply the two together to get 150 square foot room. Using the sizing chart to calculate the appropriate BTU …For example, a 1.5 Ton inverter split AC is usually fit for up to 250 square feet of area. So, you can calculate the tonnage fit for your space too. Sunlight Exposure. Another factor that affects the AC size is the amount of sun that enters the room. If your room has high sun exposure, you will need a bigger-sized Daikin air conditioner. 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. September 26, 2023 by GEGCalculators. Refrigeration pipe sizing depends on factors like system capacity, refrigerant type, and distance. For a typical residential 2-ton AC, a 3/4-inch suction line and 3/8-inch liquid line are common. …1 3/8. 1 5/8. 1 5/8. 1 5/8. Refer to DuPont Refrigerant Expert, Version 2.0 for actual velocities and pressure drops. Equivalent length is actual length plus friction losses caused by fittings and accessories. Line sizes are expressed in outside diameter of type “L” copper tubing. Line sizes are calculated at rated full load system capacity. ….

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 ...Simple; use the calculator or/and chart below, look up ‘5 kW’ and you will see that a 5 kW AC unit is basically a 1.42 Tons unit. Here is the conversion formula for kW to tons: 1 kW = 0.28434514 Tons. In short, 1 kW is equal to 0.28334514 tons. Basically, 3.5 kW is equal to 1 ton. You can use a hand calculator to calculate that.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. 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 ... Larger air conditioning units are more expensive than smaller ones. Larger units can handle a much greater volume of air, which is a necessity for bigger homes. The capacity of an AC unit is measured in British Thermal Units (BTUs). A one-ton air conditioner (about 12,000 BTUs) can cool one ton of air each hour.Jun 17, 2023 · As a general rule, an air conditioner needs 20 Btu for each square foot of living space. But other considerations, such as the ceiling height and the size of your windows and doorways, might call ... 29 Jun 2018 ... In laymen term, AC Tonnage is simply the cooling capacity or the cooling output of the air-conditioner. The calculation is quite simple. The ...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, ...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. Hvac tonnage chart, 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 ... , 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 ..., HVAC systems for all sorts of buildings, you should be able to The calculator uses the building square footage, building usage type and building shape to automatically determine the maximum and minimum overall tonnage and electrical usage of the equipment for multiple HVAC systems. The HVAC systems analyzed in this calculator include, 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 ... , 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., Calculate tonnage of heating and cooling equipment needed based on square footage of homes, such as 1 ton for every 1,000 square feet. Know the general rule of thumb for newer home..., In case you know the power in watts but want to know how many BTUs it is equivalent to, you would only have to multiply the power in BTUs by 3.412. 1 Watt = 3.412 BTU/hour. You will often find that thermal power is expressed in kilowatts (kW). 1 kilowatt equals 1000 watts. Thus, an air conditioning system requiring 2322 W will be equivalent to ... , AC Tonnage: It takes one ton of heat to remove 288,000 Btus from the air in a day. That’s the amount of Btus that must be removed to melt one ton of ice over 24 hours. Thus, a one-ton AC unit would be rated 12,000 Btus per hour. The total square feet in a home is the primary factor involved in calculating which AC is best., 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 ..., This number is typically between 18 and 60. Divide this number by 12 (representing 12,000 BTU/hr, or one ton of cooling capacity) to get the overall tonnage of the unit. This chart may also be useful when converting the numbers: 18 = 1.5 tons. 24 = 2 tons. 30 = 2.5 tons. , A sanitizing UV light for HVAC systems is one of the best ways to keep the air inside your home safe to breathe. Read on to learn why. Expert Advice On Improving Your Home Videos L..., The Btu to Tonnage Calculator utilizes a simple formula: Tonnage=12000BTUs. Here’s what each variable represents: Tonnage: This represents the cooling capacity in tons. In the HVAC industry, one ton of cooling capacity is equivalent to the amount of heat required to melt one ton (2000 pounds) of ice in 24 hours., Although tonnage is often referred to as the AC's “size”, this really means its cooling capacity. More specifically, it tells how much heat the unit can remove ..., 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 length by its width. If using meters, multiply the result by 0.092903. Multiply this by 25 BTU to get your air conditioner size., A ton, as used in the HVAC field, is a term that describes how much heat the AC unit can remove from a home in one hour. The measurement for heat is the British thermal unit (BTU). One ton of air conditioning can remove 12,000 BTUs of air per hour. A four ton unit can move 48, 000 BTUs and so on. Therefore, the more tonnage an AC unit is rated ... , , Example of big metal round and rectangular ducts (3,000+ CFM airflow). To figure out exactly how big ducts you need for central air conditioning systems, we have prepared complete CFM duct charts for all different kinds of ducts:. Duct sizing chart for flex ducts (round ducts with 5-20 inch diameter).; Duct sizing chart for metal ducts (round ducts …, If you are buying an HVAC system such as a window air conditioning unit or a mini split, the heating or cooling capacity is usually in BTUs. While smaller units use BTUs, big Home air conditioning units will often be rated in Tons, which can be confusing. ... HVAC BTU to TON Conversion Table Chart . BTU TON; 9,000: 3/4 TON: 12,000: 1 TON ..., 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, …, In conclusion, the CFM to Tons Calculator is a valuable tool in the HVAC and refrigeration industry, facilitating the design and optimization of cooling systems. Its simplicity and accuracy make it indispensable for professionals involved in air conditioning, ventilation, and refrigeration projects. FAQs. 1., 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 length by its width. If using meters, multiply the result by 0.092903. Multiply this by 25 BTU to get your air conditioner size., Below is a room air conditioner sizing chart by room size. The air conditioner sizes (BTU & Ton) are rounded to the actual common air conditioner sizes rather than just the result of the calculated cooling capacity. Hence, you can conveniently match the exact air conditioner based on your room size. Room Size (ft) BTU., Therefore, if you want to convert BTU to tons simply multiply the number of BTU by \small 8.33333 × 10^ {-5} 8.33333× 10−5 and you will obtain a corresponding number of refrigeration tons. For example, if you have 50 Btu/h: If you are curious about how to convert between different power units, check out our power converter., Elements in the AC Tonnage Chart. An understanding of the components that make up the tonnage chart will help you efficiently install the correct central air system. You will also gain an insight into what size central AC unit you need for your home or business, generating cost efficiencies in the long run., Elements in the AC Tonnage Chart. An understanding of the components that make up the tonnage chart will help you efficiently install the correct central air system. You will also …, The direct to consumer AC company in Florida. Miami 8350 NW 52nd Terrace, Suite 301-1018 Miami, FL 33166 Phone: 305-363-6303 Orlando 2212 S Chickasaw Trl, Orlando, FL 32825, When we talk about air conditioning, a “ton” is the measurement of a unit’s ability to cool. If you have a one ton AC unit, it means it has the ability to cool 12,000 BTUs an hour. Residential central air conditioners come in a range of sizes from 1.5 ton to 5 ton models., Updated February 12, 2024. Highlights. AC tonnage refers to the amount of heat an HVAC unit can remove per hour. You can find the tonnage of your AC unit on your model number located on your outdoor condenser. …, 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., To determine the tonnage of your Carrier AC unit, check the model number. The first two or three digits represent the nominal capacity in BTUs per hour. Divide this number by 12,000 to find the tonnage. For example, a model number with 24 as the first digits indicates a 2-ton unit., Koppel stresses the importance of choosing the right air conditioning size for your area not only to maximize the cooling efficiency of your unit but also to get the most value ... We have provided a simplified aircon size calculator to guide you in selecting the right size capacity for your area. Please fill in the fields below. 1. Enter 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 cooling/heating ..., 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.