Home Thermal Load Calculator

Project Settings

Enter baseline project and climate assumptions before defining assemblies or rooms.

Project Basics

Project Name Folder ZIP Code

Solar Gain Model Winter Solar Reduction Factor

Climate Design

Winter Design Temp (°F) Summer Design Temp (°F) Winter Design RH (%) Summer Design RH (%) Heating Degree Days (HDD) Cooling Degree Days (CDD) Frost Depth (ft)

Equipment & Costs

Electricity Price ($/kWh) Winter Heat Pump COP Summer Cooling COP

Ventilation & Moisture

Indoor RH Target (%) Sensible Heat Recovery (%) ERV Latent Effectiveness (%) Dehumidifier Safety Factor Infiltration (ACH50)

Quality Checks

Outlier Threshold (BTU/h·sq ft)

Progress checklist

Project Settings → Assemblies → Plan Sheets → Rooms → Summary

Project Settings
Assemblies
Plan Sheets
Rooms
Summary

Assemblies Library

Create reusable assemblies, then assign them to rooms and surfaces later.

Wall Assemblies

Foundation Walls

Window Assemblies

Door Assemblies

Floor Assemblies

Ceiling/Roof Assemblies

Plan Sheets

Upload floor plans, trace assemblies, and assign rooms.

Select a plan, upload an image, calibrate scale, then draw walls, windows, and doors.

Name Structure Group North Orientation (°) Show scale grid overlay Show north arrow + scale bar indicator Upload Floor Plan

Room Details

Select a room to review loads, then tune assemblies and setpoints.

Room Name Room Type Exterior Floor Assembly Exterior Ceiling Assembly Roof Pitch (rise/run) Winter Setpoint (°F) Summer Setpoint (°F) Ventilation CFM Occupant Moisture (pints/day)

Residential Thermal Load Calculator

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Project Dashboard

Project Workspace