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Notice: All prices in US dollars

Heat Loss Calculator

     With the rising cost of energy, heat loss due to ventilation or exhausting smoke becomes a real drain on the budget.  This heat loss calculator helps you discover exactly how much money is being wasted by opening that door or starting up an exhaust fan to clear some of the smoke.  You will also notice that this is a handy tool for justifying the purchase of that extra machine you know will make a huge difference.  We tried to keep it easy to read, but if you have questions, just call!

Heating $/hr=(.154 x CFM x (dg) x T x C)/q

Enter CFM exhausted to the outside or use 5000 CFM as a convenient value CFM =
Enter hours worked per week - T: T =
Enter available Btu per unit - q - from table: q =
Enter cost of fuel $/unit - C - from table: C =
Select desired air temp and enter annual heating degree-day normal - dg - from table below: dg =
Cost of Heating Loss per year - $ - : $

Available Btu (q) and Cost Per Unit of Fuel (C)

Fuel Type

Unit of Measure

Available Btu per Unit-q

Avg. Cost Per Unit $-C

Coal

Oil

Lbs

Gallons

6000

106500

0.0522

2.52

Gas Heat Exchanger

Gas Direct Fired

Cu Ft

Cu Ft

800

900

0.01664

0.01664

Electric

kWh

3412

0.10


Air Temp F

Albany

Boston

Chicago

Cleveland

Detroit

Minneapolis

80

78

11782

11062

10409

9690

10613

9940

11343

10621

10959

10256

13176

12478

76

74

10356

9669

8994

8317

9283

8656

9915

9229

9581

8920

11797

11142

72

70

9007

8364

7668

7046

8046

7468

8567

7928

8291

7678

10496

9870

68

66

7750

7162

6458

5903

6905

6373

7313

6722

7100

6543

9269

8687

64

62

6607

6081

5370

4873

5875

5399

6165

5636

6020

5533

8131

7590

60

5586

4399

4936

5140

5054

7086


Air Temp F

New York

Philadelphia

Pittsburgh

St Louis

Wash, DC

80

78

9284

8596

9652

8954

10797

10076

8943

8310

8422

7764

76

74

7938

7308

8285

7641

9379

8702

7702

7121

7139

6538

72

70

6706

6146

7028

6438

8050

7429

6560

6023

5974

5438

68

66

5606

5101

5886

5360

6833

6272

5523

5053

4929

4455

64

62

4621

4176

4864

4397

5734

5234

4595

4168

4014

3588

60

3747

3952

4769

3761

3182

Calculators and charts used by permission from Air Quality Engineering, Incorporated.


Example Below

Annual Heating Loss in US Dollars

CFM exhausted = 4,500 cfm
National average annual heating degree day for desired Indoor Temperature of 72 degrees = 7854
Variable for gas fired heating = 14.976
Hours of operation per week = 40 hours
Your cost of heating loss per year = $4,025.00

Check your numbers on our easy calculator to determine how many machines you might need.