- Advanced Engineering Calculations (AECalc)
 - Heating and cooling load calculation software for the HVAC construction industry. - Alerton Technologies, Inc.
- Manufactures building automation controls for energy management and HVAC.
- AustinWare
- Specialises in fan selection programmes.
- Automated Logic Corporation
- Manufacturer of building automation systems, HVAC and DDC controls, graphical programming and gateway software.
- Better Buildings Interactive, LLC
- Developers of computer-based training software for achieving thermal comfort and energy efficiency in buildings.
- Bottom Line Software, Inc.
- Service management system designed for HVAC, plumbing, electrical and mechanical contractors.
- Carmel Software Corporation
- Provider of Windows-based HVAC software.
- Coastal Computer Corporation
- Offers service management software and training for the HVAC and plumbing contractor.
- Environmental Support Solutions, Inc.
- Software, training, and facility services to help plant engineeers, HVAC/R service technicians, and environmental officers comply with regulations.
- Freedman's Quick Quote Inc.
- HVAC Sales Proposal and Estimating Software designed to create an estimate in minutes with free download.
- Grand Canyon Software
- Provides office management software for the HVAC, plumbing, electrical, and other service industries.
- Heatproof, Inc.
- Developers of HVAC, estimating, and custom designed business software.
- Honeywell ManagementPRO
- Internet-based business management system for HVAC contractors.
- HVAC Computer Systems Ltd.
- Offers HVAC-Calc software.
- HVAC Webworks
- Practical technology for small HVAC companies, including HVAC business and customer management software, HVAC website templates, and HVAC customer portals.
- HVACDATA
- Offers a programme that provides facilities administrators an overview of system operation.
- Intac International, Inc.
- Publishers of Wintac Pro, an all-in-one service management, dispatch, and accounting software solution for HVAC and plumbing contractors.
- KRS Enterprises Inc.
- Software development for plumbing, HVAC, and other service industries.
- Mestek, Inc@
 Mistral Associates
- Software developer for refrigeration and air conditioning engineering.- Quote Software
- Estimating solutions for the HVAC contractor.
- Simutech Systems, Inc
- Offers simulators which teach troubleshooting in the areas of A/C, heat pumps, furnaces, and commercial refrigeration.
- Team Management Systems, Inc.
- Software for plumbing, HVAC, and mechanical contractors.
- Wendes Systems, Inc.
- Developer of estimating software for the pipe and sheetmetal industries.
- Wrightsoft Corporation
- Publishers of Right-Suite, Right-J, and other Right- programmes used for HVAC system design.
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