MasterFormat Division 23 – Heating, Ventilating, and Air Conditioning (HVAC) in the Programming & Planning Phase

Start with [CSI MasterFormat Division 23: Heating, Ventilating, and Air Conditioning (HVAC)](/MasterFormat-division-23-heating-ventilating-and-air-conditioning-hvac) for the broad scope and coordination boundaries. This page addresses the narrower programming & planning phase intent.

Division 23 Activities During Programming & Planning

The programming and planning phase sets the foundation for every subsequent project decision. Capturing Owner Project Requirements (OPR), Basis of Design, and early scope definitions in UniFormat elements ensures design intent is structured data that estimators, specifiers, and builders can use—not just prose that requires interpretation. For Division 23 specifically, the programming & planning phase involves focused work on heating, ventilating, and air conditioning (hvac) scope, products, and execution requirements. Use relationships between UniFormat and MasterFormat to surface likely specification sections as systems firm up. Generate first-pass Tables of Contents and assign section owners early.

Key activities for Division 23 during programming & planning include:

• Surface likely MasterFormat sections as building systems are defined — as it relates to heating, ventilating, and air conditioning (hvac) sections and the products, methods, and quality standards they define
• Generate first-pass TOC and assign specification section owners — as it relates to heating, ventilating, and air conditioning (hvac) sections and the products, methods, and quality standards they define

Each of these activities requires current, accurate Division 23 section numbers. When teams reference outdated or incorrect section numbers during programming & planning, the errors propagate into every subsequent phase.

Division 23 Sections Referenced in Programming & Planning

The following Division 23 sections are commonly referenced during programming & planning work:

• 23 05 00 – Common Work Results for HVAC
• 23 09 00 – Instrumentation and Control for HVAC
• 23 20 00 – HVAC Piping and Pumps
• 23 30 00 – HVAC Air Distribution
• 23 50 00 – Central Heating Equipment

These sections define the scope boundaries, product requirements, and execution standards for heating, ventilating, and air conditioning (hvac) work. During programming & planning, these section references appear in first-pass specification toc and must be consistent with the project manual.

Programming & Planning Deliverables That Reference Division 23

Project teams produce or consume these deliverables during the programming & planning phase, many of which directly reference Division 23 sections:

• First-pass specification TOC

Every deliverable that references Division 23 must use current section numbers and titles. A single incorrect section reference in a programming & planning deliverable can trigger RFIs, scope disputes, or change orders during construction.

Common Issues with Division 23 During Programming & Planning

• Scope definitions in prose that can't be traced forward — When this occurs with Division 23 references during programming & planning, the result is rework, coordination failures, or documentation that contradicts the project manual.
• No elemental structure for early cost modeling — When this occurs with Division 23 references during programming & planning, the result is rework, coordination failures, or documentation that contradicts the project manual.
• Design intent lost between programming and schematic design — When this occurs with Division 23 references during programming & planning, the result is rework, coordination failures, or documentation that contradicts the project manual.

These issues are compounded when Division 23 sections must coordinate with other divisions. This division includes HVAC piping and pumps, HVAC air distribution, central heating equipment, central cooling equipment, decentralized HVAC equipment, HVAC instrumentation and controls, and testing/adjusting/balancing. The more trades and disciplines that touch Division 23 scope during programming & planning, the higher the cost of classification errors.

Cross-Standard Connections for Division 23 in Programming & Planning

UniFormat: Division 23 maps to UniFormat D30 (HVAC)—the mechanical services that heat, cool, and ventilate building spaces.

OmniClass: OmniClass Table 23 (Products) classifies HVAC equipment, ductwork, and controls; Table 22 (Work Results) covers mechanical installation.

During the programming & planning phase, these cross-references ensure that Division 23 specifications align with element-level classifications and lifecycle tags. Teams who rely on mechanical engineers designing hvac systems and hvac contractors and sheet metal workers to maintain these connections manually risk inconsistencies that surface as coordination issues downstream.

How CSI Dynamic Standards Helps with Division 23 in Programming & Planning

CSI Dynamic Standards includes Division 23 as part of a connected, edition-aware classification system—licensed through The Construction Standard. Built for real project work from concept to closeout and beyond, it provides always-current Division 23 section numbers and titles, governed cross-references to UniFormat and OmniClass, and edition tracking that prevents programming & planning deliverables from referencing obsolete classification data. For teams working through the programming & planning phase, this means Division 23 references in every deliverable stay accurate and consistent with the rest of the project manual.