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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

Lbs

6000

0.0522

Oil

Gallons

106500

2.52

Gas Heat Exchanger

Cu Ft

800

0.01664

Gas Direct Fired

Cu Ft

900

0.01664

Electric

kWh

3412

0.10


Air Temp F

Albany

Boston

Chicago

Cleveland

Detroit

Minneapolis

80

11782

10409

10613

11343

10959

13176

78

11062

9690

9940

10621

10256

12478

76

10356

8994

9283

9915

9581

11797

74

9669

8317

8656

9229

8920

11142

72

9007

7668

8046

8567

8291

10496

70

8364

7046

7468

7928

7678

9870

68

7750

6458

6905

7313

7100

9269

66

7162

5903

6373

6722

6543

8687

64

6607

5370

5875

6165

6020

8131

62

6081

4873

5399

5636

5533

7590

60

5586

4399

4936

5140

5054

7086


Air Temp F

New York

Philadelphia

Pittsburgh

St Louis

Wash, DC

80

9284

9652

10797

8943

8422

78

8596

8954

10076

8310

7764

76

7938

8285

9379

7702

7139

74

7308

7641

8702

7121

6538

72

6706

7028

8050

6560

5974

70

6146

6438

7429

6023

5438

68

5606

5886

6833

5523

4929

66

5101

5360

6272

5053

4455

64

4621

4864

5734

4595

4014

62

4176

4397

5234

4168

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.