LiDAR-Powered Load Calculations
Point your iPad at a room.
Get ACCA-compliant heating & cooling loads.
Capture room geometry with iPad Pro precision
ACCA-compliant load calculations
Professional documentation in seconds
Access projects from anywhere
Manual J is the ACCA standard for calculating heating and cooling loads. Every room gains and loses heat based on four primary factors.
Heat transfer through walls, windows, ceilings, and floors
Air leakage through the building shell
Heat from occupants, appliances, and lighting
Energy lost in unconditioned spaces
Results are measured in BTUH (British Thermal Units per hour).
Heat flows into the building, requiring cooling
ASHRAE publishes climate data for every US location. calc.blue applies these automatically using the 2021 dataset.
The outdoor temp your location hits 99% of winter hours.
The outdoor temp exceeded only 1% of summer hours.
Air density decreases with elevation, affecting heat transfer.
| City | Elevation | ACF |
|---|---|---|
| Miami | 6 ft | 1.00 |
| Denver | 5,280 ft | 0.84 |
| Santa Fe | 7,199 ft | 0.78 |
Source: ASHRAE 2021 Climatic Design Conditions via Climate.OneBuilding.org
calc.blue transforms LiDAR geometry into ACCA-compliant BTUH loads in three steps.
Point your iPad Pro. RoomPlan API captures walls, windows, doors, orientations, floor area, ceiling height, and volume.
Q = U × A × ΔT × ACFHeat flow calculated for every surface.
12 load categories per room: walls, windows, doors, ceilings, floors, infiltration, ventilation, ducts, occupants, appliances, blower heat, daily range credit.
Drag to rotate. Click surfaces to highlight.
Air leakage accounts for 15-30% of heating and cooling load. Tight construction reduces energy waste significantly.
CFM_natural = CFM50 / NN ≈ 20 for typical construction
Air changes per hour for tight construction
1.1 × ACF × CFM × ΔT0.68 × CFM × ΔWDuct location and sealing quality determine how much conditioned air reaches the living space.
| Class | Leakage Rate | Factor |
|---|---|---|
| Sealed | 12 CFM/100 sqft | 1.00× |
| Notably Sealed | 9 CFM/100 sqft | 0.50× |
| Partially Sealed | 24 CFM/100 sqft | 2.00× |
Click zones to view temperatures and losses. Rotate to explore.
Oversized AC short-cycles and never dehumidifies properly. The result: cold, clammy air and mold risk.
of calculated load
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Three steps from walking through a building to delivering a professional load calculation.
Walk through with iPad Pro
ACCA 8th Edition engine
Branded load calculation report
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