Appliance Name:

Used to enter unique name for appliance or group of similar appliances.

Electricity Usage kWh/year:

This value should represent the total annual electricity usage. This usage is assumed to be uniform throughout the year. TREAT assumes that appliance usage is distributed uniformly throughout the day.

Second Fuel:

Use this input to specify a second fuel (if any) used by the appliance from the list of fuels entered on the Fuels/Rates screen. Do not include the hot water fuel in this field. For example, a gas dryer has two fuels – electricity and natural gas. An electric dishwasher does not have a second fuel, even though it may use hot water from a gas water heater.

Annual Second Fuel Usage:

This value is the total annual usage of the second fuel. The value must be entered in Second Fuel Units per year displayed in the separate field. The units depend on the selected fuel and are the same as on the Fuels/Rates screen for this fuel. The usage is assumed to be uniform throughout the year.

Hot Water Usage gallons/year:

The annual hot water usage for a particular appliance. The usage is assumed to be uniform throughout the year. It is added to the hot water heater load and is accounted for in all calculations related to domestic hot water.


Marks the space in which appliance is located. The information is used for internal heat gain calculations.

Percent Heat Loss to Space:

The percentage of energy supplied to appliance that contributes to space internal gains. Most appliances lose all of their consumed energy to the surrounding space in the form of heat. For these appliances, Percent Heat Loss to Space should be set to 100%. However, some appliances eject part of the heat to the exterior. For example, a clothes dryer heats up air and then discharges it through the vent to outdoors. If you are not sure what to enter in this field look for a similar appliance in the Appliance Library. TREAT assumes that 10% of the heat from the domestic hot water consumed by the appliance contributes to space heat gain.

Note: Fans entered on the Appliances screen will only model the electric use of these fans and not the effect on heating or cooling that the fan has. The fans must also be entered on the Fans screen to model the heating and cooling effects of the mechanical ventilation.

Field Measurements: 

This button opens the Appliance Metered Usage window. This calculator allows you to easily convert field measurements of energy consumption into yearly figures and copy them into the TREAT Appliances screen. Using a wattmeter and similar tools, you can record the consumption of electricity, second fuel, and hot water during measured time intervals. After entering the measured usage and time interval, click the Done button and the yearly usage will be calculated and copied to the input line for the current appliance.

Adjust Usage Assumptions:

This option can be found in the Appliance Library; this button opens the Adjust Usage Assumptions window. This calculator allows estimating annual fuel usage by a washer, dryer, dishwasher or cooking appliance based on how frequently the appliance is used. The annual fuel usage given in the appliance library is based on assumptions that are listed in the library, such as a stove being used for two hours each day. To calculate the annual usage if the stove was only used for 15 minutes each day, select the appliance in the library, click the Adjust Usage Assumptions button, and select the correct assumption from the drop-down list. Click the Done button and the revised yearly usage will be copied to the input line for the current appliance.