Load Calculation For Commercial Heating

Outside Temp. F

Select nearest city

(Canada at bottom)

Select Fuel Type

Enter Fuel Cost

How well is the building insulated?

             Excellent Average Poor

Total Exposed Lineal Feet
(Do Not Use Comma's)

             Ft.

Wall Height

U Factor of Exposed Walls

Total Area of Windows

             Sq. Ft.

U Factor of Exterior Windows

Total Area of Doors
(Do Not Use Comma's)

             Sq. Ft.

U Factor of Exterior Doors

Total Area of the Roof
(Do Not Use Comma's)

             Sq. Ft.

U Factor of Roof

Total Lineal Feet of the Floor

             Ft.

U Factor of Floor

(As a "rule of thumb,"

double equipment size

for wood or dirt floors)

Total Weight of Materials
(Do Not Use Comma's)

             Pounds

Specific Gravity of Material

Time (Hours) to heat up cold mass

1 2 4 6 8 12 24

How many air changes occur in an hour?

Mechanical Exhaust

(heating season)
(Do Not Use Comma's)

Are you using outside air for combustion?

(This will be used for capacity sizing. As a general

rule, using outside air adds 3% to the total load.)

What is the mounting height of the heaters?

(As a rule for Infrared heating, for every foot over

15 feet, the total load is increased by 1%.)

Select a Model

(The efficiencies listed are "Cyclic" efficiencies.

This is defined as an average efficiency for

an average system run time (15 min.).)