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System Design Load

System Design Load (SDL) is a program by Carrier that calculates design cooling and heating loads for commercial buildings to facilitate HVAC system design. It supports system-based design techniques considering specific HVAC system features for accurate load estimating and system sizing calculations.
Latest: 6.31
Last checked: Feb 5, 2026 10:52pm
Rank: 2257/15140
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Overview

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Winget: Available

Version & Lifecycle

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Current: 6.31 N-2: 6.3 Oldest supported: 6.20 Avg cadence: Every 105 days

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

Community Notes

Deployment tip • May 26, 2026
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SystemDesignLoad prerequisite note

For managed System Design Load deployments, pre-stage the Microsoft Visual C++ v14 Redistributable runtimes for both x86 and x64 before installing or updating the Carrier load-calculation software. Track the runtime pair as deployment dependencies so install failures are not misdiagnosed as a System Design Load package problem. Source: official SystemDesignLoad source.

For managed System Design Load updates, close the Carrier load-calculation application before launching setup. If it remains open, the update can fail with Exit Code 5; close the application first and verify the installed version afterward.

Source: System Design Load official source.

Release Notes & Updates

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SystemDesignLoad

Notes

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Version 6.20 includes enhancements such as an 'Import gbXML' option and an updated calculation engine based on EnergyPlus version 23.2, improving calculation accuracy and speed.