# Room Heating Calculator

Use our room heating calculator to determine the most efficient and economical way to heat a large enclosed area.

## Instructions

The Room Heating Calculator is designed to be an approximate sizing guide for determining heat loss from a room. The Wizard will determine a total heat loss value based on your specific room data. The resulting value can then be used for specifying the appropriate Chromalox comfort heater for your heating needs.

### 1. Room Size & Specs

 Length: ft. Width: ft. Height: ft. Total Sq. Footage: ft. Room Cu. Footage: ft.
Item Area R-Factor = BTU/Hr/Degrees F
Windows Sq. ft. x =
Doors Sq. ft. x =
Net Walls Sq. ft. x =
Roof Sq. ft. x =
Floor Perimeter* Sq. ft. x =
Transmission Losses Total =

*Use the R-Factor Reference to lookup common material R-Factor values. Important: R-Factor values are additive. For example, 2" of softwood results in an R-Factor of 2 x 1.25 = 2.5.

*For floor perimeter use U-factor of 1.2 for 1" insulation or 0.7 for 2" insulation.

### 2. Design Information

 Air Changes per hour: Outside Design Temp: Inside Design Temp: Temperature Difference:

### 3. Calculations

 Air Changes Loss: Cu. Ft / hr x0.019 BTU / Cu. Ft = Total Losses Transmission Losses + Air Change Loss =

#### Total Heating Requirement

Total Losses x Temperature Difference = Total BTU / Hr
BTU/Hr/Degrees F x Degrees F = BTU / Hr

#### Conversion to Watts

Total BTU / Hr / 3.412 BTU per watt = Total Watts per hour