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PICKHVAC Terms of Use: Some of the products seen on our site are delivered through a relationship with outside suppliers like Networx.com, Google, and others. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. Math equations can be difficult to deal with, but with practice, they can become easier. Size of air conditioning condenser. Lets look at a similar calculator and chart for more energy-rich propane: Here you just insert the CFH of propane and the calculator will tell you how many BTU is that: Lets solve one example for propane as well: How many BTU is 175 CFH of propane? In order to estimate your generator size requirement, please enter the square footage of your home, then select which appliances you would like to run during a power outage. In order to estimate your generator size requirement, please enter the square footage of your home, then select which appliances you would like to run during a power outage. Given that the desired temperature of the residents is 75F, the desired temperature increase would be 75F - 30F = 45F. These applications will - due to browser restrictions - send data between your browser and our server. Natural gas contains 36,303 BTUs per cubic meter (35.3 cubic feet). Find where you live, and input the zone. The color of the roof. WebBTU (Natural Gas) = CFH Of Natural Gas 1037 BTU (Propane) = CFH Of Propane 2517 As we can see, to calculate BTU from the CFH of natural gas, we have to multiply CFHs by 1037. What size furnace do I need for a 1,000 square foot home? Only emails and answers are saved in our archive. And in cold climates multiply the square foot number by 30 - 40. Is the furnace youre considering listed by input or output? WebHow to use Kohler's Home Generator Sizing Calculator. Heres How SEER Is Calculated, How Much Propane Do Heaters Use? For instance, if you are converting a rate of 500,000 BTUs per hour: 500,000 100,000 = 5 Many other names are given to tools and methods that convert natural gas measurements between the substance's common units. Boilers: 100,000 - 200,000 BTUs/hr* Natural gas has roughly 1,050 BTUs per cubic foot (0.028 cubic meters). You also can convert 1 Cubic Foot Of Natural Gas to other energy units. So, consider furnaces of 90% and higher AFUE. For example, if youre trying to heat 1000 square feet in a cold climate, 30,000 - 40,000 BTUs will add significant warm air to your home. Measure the length x width of each. Free time to spend with your family and friends. Solve Now. Here are these two equations: As we can see, to calculate BTU from the CFH of natural gas, we have to multiply CFHs by 1037. Multiply that by 100,000 to get the price per hour youll pay to run the furnace: about 87 cents. Pressure are approximate for hose length up to 25 feet; increase for longer lengths about 3 PSIG per 25 feet and increase working pressures 2-3 PSIG for check valves. Generally, newer homes have better insulating ability than older homes due to technological advances as well as stricter building codes. Multiply each components percentage by its heating value to find the total heating value of the natural gas sample. Money Saving Tip:Adding attic insulation to an attic that is inadequately insulated is the #1 best way to lower your heating bills and get the best return on investment. To use the calculator, place your cursor in the desired unit field and write a number. We rely on readers like you to share your HVAC system cost or quote. For exact measurements, you have two options that will work well enough. Deal with math equations. Deal with math equations. If needed use the dot "." Generator Size (kW) Contact us at 877-847-0050 or email sales@TotalHomeSupply.com Total Home Supply WebNatural gas conversion calculator cubic feet Btu megajoules cubic meters 1 cubic foot = 1,039 Btu ( based on U.S. average for natural gas delivered to consumers in 2021, preliminary) Crude oil conversion calculator barrels Btu megajoules liters 1 barrel = 42 U.S. gallons = 5,691,000 Btu ( based on U.S. production in 2021, preliminary) Our natural gas converter is a unique tool that let you convert between different units of measuring natural gas. How many btu to heat 1000 sq ft? We assumed 102,000 Btu/CCF in our calculations. No Not for residential use. BTU as a unit of measurement is more useful than physical quantity because of fuel's intrinsic value as an energy source. Secondly, youll get an accurate result when sizing your furnace. WebFor 1 m 3 of natural gas, you would multiply by 1 m 3 by 0.0353, which would give you 0.0353 MMBtu. 10 British Thermal Units to Cubic Feet Of Natural Gas = 0.01. 95% furnace:95% of heat is transferred, and 5% is lost. Carbon dioxide emissions per therm are determined by converting million British thermal units (mmbtu) to therms, then multiplying the carbon coefficient times the fraction oxidized times the ratio of the Pro Tip:For smaller rooms/zones/apartments, aductless mini split heat pump is another really good option. Not only will placing it in a shadier area result in greater efficiency, but it will extend the life of the equipment. A BTU describes the energy content or heat value of fuels. %. Energy required to raise the temperature of 1lb of water by 1F. It can be difficult to tell. The amount of energy that is needed to either cool or heat one pound of liquid water one degree Fahrenheit at Thermostats placed in dead spots can inaccurately manage the temperatures of homes. For example: 85% x 1,031 = 876 + 10% x 1,075 = 108 + 3% x 1 ,265 = 38 + 2% x 2 , 488 = 100 4. Sun Exposure: Climate and the trees around your home factor into this box. WebWith our smart calculator you can easily convert between the two weight units thmand BTU. 1 ft3 = 1,039 BTU The steps to convert from ft 3 to BTU are: Note down the quantity in ft 3; Multiply it by 1,039; and The result is the quantity in BTU. This is straightforward. 1 BTU = 0.293 watt hours; 100,000 BTU = 1 therm; 3,413 BTU = 1 kilowatt hour; Common BTU ratings. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2014-2023, PICKHVAC All Rights Reserved. as the decimal separator. WebGas calculator - equation Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm Conversion table 1 BTU = 0.293 watt hours 100,000 BTU = 1 therm 3,413 BTU = 1 kilowatt hour Common BTU ratings Boilers: 100,000 - 200,000 BTUs/hr* Many air heating applications use steam or hot water coils to heat the air. Furnace Input/Output:This is a confusing topic that weve alluded to in the content above. With these two equations, we can convert CFH to BTU via a simple calculator you will find here (1st calculator for natural gas and 2nd calculator for propane). It is a unit to measure the heat energy produced by fuels, in The smallest gas furnaces start at about 30,000 BTU per hour, or BTU/h. A 3-year-old home inside a newly developed community most likely deserves a good rating. Make sure only one gas appliance is on and keep an eye on the gas meter to see how long it takes to utilize one cubic foot of gas. It will vary due to the material, sill of the operator in the working conditions. Our natural gas converter is a unique but swiftly straightforward tool. Using our rounded safe number of 1000 BTU per cubic foot on natural gas the required flow rate for this new unit heater would be 1000 CFH (100,000 1000) Heating Air with Natural Gas . WebBTU (Natural Gas) = CFH Of Natural Gas 1037 BTU (Propane) = CFH Of Propane 2517 As we can see, to calculate BTU from the CFH of natural gas, we have to multiply CFHs by 1037. For example, a home owner in Atlanta might want to determine their BTU usage during winter. >Use this Furnace Sizing Tableto check your results compared with the most common results. The Greenhouse Gas Equivalencies Calculator uses the eGRID U.S. national annual average CO 2 Therms and Mcf of natural gas. These brief instructions give details for providing accurate inputs into the sizing calculator. Propane BTU Calculator: How Much Propane Does a Heater Use? WebPlease note that this table is intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed. Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. The largest gas furnaces create about 140,000 BTU/h. If it is unheated, then dont. Use the calculator, or for a quick answer, see the examples below that answer common questions like: We take the size, climate and insulation value, and give you the most accurate furnace btu calculation results youll find online. You also can convert 1 Cubic Foot Of Natural Gas to other energy units. Thirdly, if you have a furnace salesperson in to give you a quote, youll be able to knowledgeably discuss furnace sizing with them, so you will feel in charge of the process rather than wondering what they are talking about! For example, if the cost for natural gas is $17.50 per 1,000 cubic feet, then divide by 10 and enter 1.75 as the price per therm. For natural gas the nominal BTU/cf varies from about 900 to 1100 BTU/cf. The natural gasoline equipment calculator is an estimate fee of home equipment. If youre living in Seattle, a 90,000 BTU furnace would only heat a 2,000 sq ft home. In terms of being sealed, is your homes exterior covered in house wrap like Tyvek? 80% furnace:80% of the heat is transferred into ductwork while 20% is wasted out the exhaust vent. SG = particular gravity of herbal gasoline For herbal gasoline the nominal BTU/cf varies from approximately 900 to 1100 BTU/cf. You can choose between 20 different popular kitchen ingredients or directly type in the product density. NG Default Clear Form. Web1 Cubic Foot of Natural Gas: 1000 BTU IT: 1 British Thermal Unit (International Table): Most common use of term BTU in everyday language. This type of heating equipment is growing in popularity, especially where free or cheap wood is readily available. WebFUEL QUALITY CALCULATOR. You might also want to consider this question: How much sun does your climate get? WebThis page features online conversion from standard cubic foot of natural gas to British Thermal Unit.These units belong to different measurement systems. If you dont know it, the information might be found on a blueprint or house drawing, in closing 1 m 10,55 kWh 0,01055 MWh. Multiply that by 100,000 to get the price per hour youll pay to run the furnace: about 87 cents. Our results are the easiest to understandbecause we list them by the furnace AFUE you choose and the number of BTUs required for your home. The image below shows how much attic insulation your home should have. %. The main issue is shade some/little/none. ** Enter the price of electricity in dollars. Consider a six-sided home. Make sure only one gas appliance is on and keep an eye on the gas meter to see how long it takes to utilize one cubic foot of gas. Download PDF of Natural Gas Fuel Consumption Chart. The correct rating is BTU/hour, or BTU/h, meaning how much heat does the equipment create in one hour of constant operation. You should choose Average Sun Exposure and Zone 5 based on the Climate Zone Map and Sun Exposure Map. Contact us at 877-847-0050 or email sales@TotalHomeSupply.com Total Home Supply So, use the calculator and input different efficiency ratings based on the furnaces you might be considering. Using our rounded safe number of 1000 BTU per cubic foot on natural gas the required flow rate for this new unit heater would be 1000 CFH (100,000 1000) Heating Air with Natural Gas . That is because 1 CFH of natural gas contains 1037 BTU of energy, according to the US Energy Information Administration. Natural gas has roughly 1,050 BTUs per cubic foot (0.028 cubic meters). 10 British Thermal Units to Cubic Feet Of Natural Gas = 0.01. Q: What size furnace do I need for a 1000 sq ft home? The amount of energy that is needed to either cool or heat one pound of liquid water one degree Fahrenheit at WebHow to use Kohler's Home Generator Sizing Calculator. WebThe British Thermal Unit, or BTU, is an energy unit. It will vary due to the material, sill of the operator in the working conditions. The first one is from Natural Gas Energy Equivalent.The second one is from British And American. WebBTU Calculator A BTU or British thermal unit is a unit of energy. Atlanta winters tend to hover around 45F and temperatures may fall as low as 30F occasionally. Use our calculator for the most accurate results the kind of results youd get by spending $300+ for a Manual J Load Test administered in your home by a licensed HVAC technician. As an Amazon Associate we earn from qualifying purchases. 80% = 80,000 BTU transferred to heat your home. Youre here for the bottom line what size furnace (gas, propane or oil) do I need. 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hours, or the energy released by burning one match. The 95% furnacemight be a little big, but it will definitely heat your home. Deal with math equations. It is a unit to measure the heat energy produced by fuels, in this case, natural gas. The Greenhouse Gas Equivalencies Calculator uses the eGRID U.S. national annual average CO 2 Therms and Mcf of natural gas. = 4.5 x CFM x h (std. To get this number in units of BTU, you would multiply it by 1000000, which would give you a total of 35300 BTU in an m 3 of gas. Lignite coal which is lowest grade of coal may only have 14 million BTU's per ton, the highest quality anthracite can exceed 28 million. How many BTU are you piping into the house? In Minnesota, a home with no shade would still only be Average for sun exposure, for example. Its a wide range. air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. Most top brands Carrier, Trane, Lennox, Rheemand all the others, make furnaces with heating capacities of 40,000 or 50,000 BTUs on the low end to 120,000 to 140,000 BTUs on the upper end. It is approximately the energy needed to heat one pound of water by 1 degree Fahrenheit. BTUs/hr; Gas Fireplace (trendy) 25,000 35,000 BTUs/hr; Generator (standby). 2. Pressure are approximate for hose length up to 25 feet; increase for longer lengths about 3 PSIG per 25 feet and increase working pressures 2-3 PSIG for check valves. Decide mathematic question. This will NEVER affect our opinion of a product or service! If you like it toasty inside, use the warmer zone (lower number). Following that, we do the math for readers that prefer a quick, accurate answer to what size furnace do I need?. Conversion table. WebThe calculator provides indicative conversion of gas consumption in cubic metres to kilowatt-hours and other units. WebHeating BTU Calculator Room Dimensions (in feet) Length: Width: Ceiling Height: Insulation: Lowest Outside Temperature: Btu/Hr Required: Vent Free Heaters Vented Heaters Gas Unit Heaters Not sure which unit is right for you? BTUH = BTUs per hour . Webenergy content in natural gas 1000 Btu/ft 3 (37.26 MJ/m 3) steel pipes schedule 40; For natural gas the nominal BTU/ft 3 varies from about 900 to 1100 BTU/ft 3. Lignite coal which is lowest grade of coal may only have 14 million BTU's per ton, the highest quality anthracite can exceed 28 million. Cost to operate = usage (hours or load) x (BTUs/100,000) x price per therm OR Cost to Operate = usage (hours or load) x therms x price per therm. WebSelect Gas Type: Calculate. 1 Cubic Foot (CF) = approx 1000 BTUs; 1 CFH = 1 MBH; The specific gravity of natural gas varies from 0.55 to 1.0. WebSG = specific gravity of natural gas. The natural gasoline equipment calculator is an estimate fee of home equipment. 3. There are factors other than climate, and they are used in our heating BTU calculator below to give you the most accurate information. 1. These are quick answers. WebGAS PIPE SIZING CHART. One cubic foot (0.028 cubic meters) of propane contains about 2,516 BTUs To find the desired change in temperature to input into the calculator, find the difference between the unaltered outdoor temperature and the desired temperature. In general it is common to set. Jan 2023 Heating Costs Update: Due to unprecedented recent increase in cost of all heating fuel types, average cost of Natural Gas has increased by as much as $0.50 per Therm, Heating Oil is around $5/gallon & Propane has gone up by $0.90/gallon. The units to measure natural gas in terms of heat and energy generation are: If you come from a "metric" country, you'd likely be familiar only with the Joule: visit our energy conversion calculator to orient yourself with these different and more specific measurement units. Multiply each components percentage by its heating value to find the total heating value of the natural gas sample. Rene has worked 10 years in the HVAC field and now is the Senior Comfort Specialist for PICKHVAC. Ethane,C 2 H 6. What About Wood Stove/Boilers and Combi Boilers? Turn on more accessible mode. The Greenhouse Gas Equivalencies calculator allows you to convert emissions or energy data to the equivalent amount of carbon dioxide (CO 2) emissions from using that How to use it? Try to place the air conditioner condenser on the shadiest side of the house (typically north or east). That is because 1 CFH of propane contains 2517 BTU, according to Inspectapedia. Cost of electricity has gone up by $0.02 $0.13 per kWh. WebThis page features online conversion from normal cubic meter of natural gas to British Thermal Unit.These units belong to different measurement systems. Use this calculator to estimate the cooling needs of a typical room or house, such as finding out the power of a window air conditioner needed for an apartment room or the central air conditioner for an entire house. SG = particular gravity of herbal gasoline For herbal gasoline the nominal BTU/cf varies from approximately 900 to 1100 BTU/cf. If you keep your thermostat low during the winter and wear an extra sweater for warmth, choose the cooler zone (higher number) for your location. This is a volumetric flow of gas that we use we can find on home energy meters (GFH on the gas meter). Convert emissions or energy data into concrete terms you can understand such as the annual CO 2 emissions of cars, households, and power plants.. Cost of electricity has gone up by $0.02 $0.13 per kWh. *The fuel content of the volume of natural gas can vary. And for heat pumps, it is the same as for air conditioners the amount of heat moved from outside to inside during heating. Sometimes there is no indication in the furnaces model name; other times the information is right there. 1. Web500 British Thermal Units to Cubic Feet Of Natural Gas = 0.5. Typical values are in the range 0.6 - 0.7. The converter would determine that 2,600joules=2.465BTU2,600 \text { joules } = 2.465 \text { BTU}2,600joules=2.465BTU. In a cubic meter or foot of natural gas, how many BTUs are there? 1 ft 0.028 m, 1 m 35.315 ft. If one MCF costs $9.00: Divide the price per MCF by 1,028,000 to get the price per BTU: $0.00000875486. Boilers: 100,000 - 200,000 BTUs/hr* PickHVAC is also a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. You can use it to answer the common questions like: At some point, depending on the climate, you have to begin to think about more than one heating device furnace, boiler, heat pump, etc., for your home. The desired temperature change is the necessary increase/decrease from outdoor temperature to reach the desired indoor temperature. WebNatural Gas Unit Conversion Calculator. WebLets say you have a furnace with a BTU rating of 100,000 and your gas bill is measured in MCFs. WebBTU (Natural Gas) = CFH Of Natural Gas 1037 BTU (Propane) = CFH Of Propane 2517 As we can see, to calculate BTU from the CFH of natural gas, we have to multiply CFHs by 1037. Make your choice and enter data for each box, and let the heating BTU calculator do the work. You may also want an aveargefurnace BTU per square foot rule of thumb to help you calculate the furnace size without an online calculator. The amount you calculate for an appliance's BTU capacity should be close to the nameplate "input" BTUH on the device. How to use it? 1 BTU = 0.293 watt hours; 100,000 BTU = 1 therm; 3,413 BTU = 1 kilowatt hour; Common BTU ratings. For example, in Hungary, the heat value of natural gas has an average of 34.12 MJ/M3. The full name is British thermal unit. Sample Name: All values should be entered as mole %, unless otherwise noted. A long narrow house has more walls than a square house with the same square footage, which means heat loss. The Pick HVAC Furnace Sizing Calculator gives results with BTU sizes over 200,000 BTUs. (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? Know your Numbers! Similarly, to calculate BTU from the CFH of propane, we have to multiply CFHs by 2517. 1 ft 1,037 Btu. Use the content above to get the most accurate gas furnace sizing calculator available anywhere. On average, this represents WebNatural gas conversion calculator cubic feet Btu megajoules cubic meters 1 cubic foot = 1,039 Btu ( based on U.S. average for natural gas delivered to consumers in 2021, preliminary) Crude oil conversion calculator barrels Btu megajoules liters 1 barrel = 42 U.S. gallons = 5,691,000 Btu ( based on U.S. production in 2021, preliminary) This furnace size calculator uses your house size, climate (see the map below) and other important information to tell you what size furnace your home needs to keep it warm without wasting energy. Our Furnace BTU Calculator tells you how much heat how many BTUs you need to keep your home warm in winter. Typically, BTU usage is measured based on the volume of the space. Thermal insulation is defined as the reduction of heat transfer between objects in thermal contact or in the range of radiative influence. For example: 85% x 1,031 = 876 + 10% x 1,075 = 108 + 3% x 1 ,265 = 38 + 2% x 2 , 488 = 100 4. If you need to convert normal cubic meter of natural gas to another compatible unit, please pick the NG Default Clear Form. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? Lets first look at the units we are converting: To convert CFH to BTU at 100% efficiency, we only need 1 equation for each gas (natural gas and propane). Natural gas is a significant industrial and domestic fuel. You probably dont need a more efficient furnace. 10 British Thermal Units to Cubic Feet Of Natural Gas = 0.01. Ceiling fan usage. Typical values are in the range 0.6 - 0.7. Both ft3 and m3 are units to measure the volume of the gas. It really helps other visitors to estimate the cost of a new HVAC unit. Many air heating applications use steam or hot water coils to heat the air. 2. Even though they're physical commodities and are quantified accordingly, such as by volume or barrels, they can be converted to BTUs depending on the energy or heat content inherent in each quantity. Natural gas is one of the most widely used fuels worldwide, and has many units of measurement based on what we're using it for. WebThe calculator provides indicative conversion of gas consumption in cubic metres to kilowatt-hours and other units. In general it is common to set. On average, this represents If one MCF costs $9.00: Divide the price per MCF by 1,028,000 to get the price per BTU: $0.00000875486. How much is this quantity in meters? Turn off more accessible mode. You can target the Engineering ToolBox by using AdWords Managed Placements. 14 Culprits To Check For Now, MMBTU To MMSCFD Calculator For Natural Gas + Chart, 8 Best Infrared Heaters For Indoors, Patios, Garages (With ECO Thermostats), AGM Battery Voltage Charts: 12V, 24V Deep Cycle Battery Voltage, Lead-Acid Battery Voltage Chart For 6V, 12V, 24V, 48V Batteries, Natural Gas MMSCFD To MMBTU/Day Calculator + Chart. The first one is from Natural Gas Energy Equivalent.The second one is from British And American. Decide mathematic question. Energy required to raise the temperature of 1lb of water by 1F. Cookies are only used in the browser to improve user experience. But if you live in very south, it can heat more than 1,000 sq ft. A BTU is a measurement of heat specifically, the heat needed to raise the temperature of one pound of water 1 degree Fahrenheit. WebFor 1 m 3 of natural gas, you would multiply by 1 m 3 by 0.0353, which would give you 0.0353 MMBtu. Here is the full CFM to BTU conversion chart for natural gas: As you can see, this chart illustrates well how many BTU you get from CFH of natural gas. Use the Pick HVAC Gas Furnace Sizing Calculator, and when you get estimates from furnace contractors in your area, youll have a very clear understanding of what to expect. For example, a room 24 feet long and 15 feet wide is 360 square feet. For example, 600 CFH of natural gas is equal to 622,200 BTU. Thats pretty straightforward. Decide mathematic question. For most consumers in Canada, theres a natural gas meter on the outside Make sure only one gas appliance is on and keep an eye on the gas meter to see how long it takes to utilize one cubic foot of gas. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. WebThis Natural Gas conversion calculator is a unit conversion tool dedicated to the units used in measuring natural gas. WebNatural gas conversion calculator cubic feet Btu megajoules cubic meters 1 cubic foot = 1,039 Btu ( based on U.S. average for natural gas delivered to consumers in 2021, preliminary) Crude oil conversion calculator barrels Btu megajoules liters 1 barrel = 42 U.S. gallons = 5,691,000 Btu ( based on U.S. production in 2021, preliminary) Please read AddThis Privacy for more information. Webnatural gas M3* natural gas MCF* steam pounds ton-hour gasoline gallons diesel gallons propane gallon kerosene gallons fuel oil #2 gallon fuel oil #6 gallon coal tons wood cord *The fuel content of the volume of natural gas can vary. Instead, it circulates through a pipe in your hot water tank to provide you with what is called domestic hot water. Home Size: Enter the square footage of your home. Divide the energy transfer rate in BTUs per hour by 100,000, which is the number of BTUs in a therm. %. The maximum allowable BTU/Hr will be visible where the two lines intersect. Like most appliances, the efficiency of a heater or air conditioner decreases with usage. How to use it? It is an exact measurement that can be applied to most heating equipment. Please enable scripts and reload this page. %. He holds an HVAC associate degree from Lone Star College and EPA & R-410A Certifications. For example, if the cost for natural gas is $17.50 per 1,000 cubic feet, then divide by 10 and enter 1.75 as the price per therm. To use the calculator, place your cursor in the desired unit field and write a number. If your home is surrounded by tall trees that shade the walls and the roof and few are then choose Heavily shaded. Break down the home into rectangles. WebBtu to cfh conversion natural gas calculator. The Greenhouse Gas Equivalencies calculator allows you to convert emissions or energy data to the equivalent amount of carbon dioxide (CO 2) emissions from using that WebPlease note that this table is intended to be used as an estimate of how much fuel a generator uses during operation and is not an exact representation due to various factors that can increase or decrease the amount of fuel consumed. Table of Furnace Sizing by Square Footage. Location of the air conditioner condenser. BTUH = BTUs per hour . The maximum allowable BTU/Hr will be visible where the two lines intersect.