Total square footage of the conditioned space in the home. If you want us to attempt to pull SQFT Data from our real estate API simply leave this input as 0. If no data is found in our third party data set this will default to 1700.

If you wish to calculate load with Altitude Correction Factor, please select the home elevation value.

Enter square footage of load bearing ceiling minus the square footage of skylight openings. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Any load bearing exterior walls above grade minus the square footage of windows and glass doors. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Average R-Value of the load bearing exterior wall construction

Enter the house average R-value of the load bearing floor construction over unconditioned space

Enter the average R-value of the load bearing ceiling below attic or exposed to outside conditions

Enter the average R-value of the perimeter insulation installed during house construction.

Enter the average R-value of the load bearing floor construction over unconditioned space.

Specifies the generic or NFRC-rated solar heat gain characteristic of the glass

Enter the square footage of floor area that has an unconditioned basement space beneath it. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Enter the square footage of floor area that has an unconditioned crawl space, garage, outdoors (in the case of floor overhangs) beneath it.

The coldest winter ambient temperature of the unconditioned space below the conditioned living space.

If the floor of a room is not concrete slab on grade, you should leave the perimeter as zero.

If the residence has a conditioned basement, enter the percentage of the load bearing basement walls exposed to outside conditions below grade.

If the residence has a conditioned basement, enter the square footage of floor area for a conditioned basement.

If the residence has a conditioned basement, enter the average R-value of the load bearing basement walls exposed to outside conditions.

This input is based on duct system performance. Enter the percentage of BTUs lost from
thermal losses.

This input is based on duct system performance. Enter the percentage of BTUs gained from
thermal gains.

Set a rate of infiltration (estimated natural infiltration rate - ENIR) based on the construction tightness and floor area of the building (if you have an ACH50 number divide it by 20 for the ENIR and enter that value)

Specifies the amount of outside air that is mechanically introduced into the conditioned space by the HVAC equipment either through a duct with barometric or mechanical damper, Energy Recovery Ventilator (ERV), or Heat Recovery Ventilator (HRV).

Square Footage of glass on side of house that has the most glass. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Glass square footage 90 degrees counter-clockwise from side of house with most glass. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Glass square footage 90 degrees clockwise from side of house with most glass. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Glass square footage 180 degrees opposite from side of house with most glass. If you want us to auto-estimate this value based off of total home square foot simply leave the default value of 0.

Enter the percentage of glass shading you observe due to trees, awnings, porches, and overhangs.

What direction of the house has the most glass

If not set by local codes, this is the inside temperature that the client wishes to maintain during the cooling season.

This value represents the highest outdoor dry bulb ambient temperature that you expect the HVAC system to handle. If you want us to attempt to pull weather data automatically from our database leave this input as 0.

If not set by local codes, this is the inside temperature that the client wishes to maintain during the heating season.

This value represents the coldest outdoor dry bulb ambient temperature that you expect the HVAC system to handle. The winter design temperature is used to determine the worst case heating load. If you want us to attempt to pull weather data automatically from our database leave this input as 0.

Grains of moisture is the amount of moisture or water vapor per pound of dry air at standard atmospheric pressure at relative humidity ranging 10-90%.

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