Service Overview
HVAC Design Services for High-Performance Buildings
HVAC design is more than selecting equipment and routing ductwork. It requires an integrated understanding of building loads, occupancy, climate, space constraints, energy performance, controls, maintainability and interaction with other building systems.
Desapex delivers Heating, Ventilation and Air Conditioning (HVAC) design services that combine mechanical engineering expertise with advanced load analysis, simulation and BIM-led coordination. Our engineers develop HVAC systems designed to provide thermal comfort, indoor environmental quality, energy efficiency and dependable performance across the building lifecycle.
Our scope includes cooling and heating load calculations using HAP, HVAC system selection, equipment sizing, chilled water system design, pressurisation systems, duct sizing and routing, and Computational Fluid Dynamics (CFD) analysis. MEP Brochure Landscape
Rather than treating HVAC engineering and BIM as separate activities, we bring them together in one digital workflow. Designs are evaluated for performance, spatial requirements and multidisciplinary coordination before they move toward construction, helping project teams make better-informed decisions earlier.
Our Digital-First Approach
Data-Driven Load Analysis
We begin with building geometry, envelope characteristics, occupancy, climate and operational requirements to establish accurate cooling and heating loads. HAP-based analysis creates a reliable foundation for HVAC system design and equipment sizing.
Performance-Based System Selection
We evaluate HVAC system requirements against capacity, energy performance, space availability, maintainability and lifecycle objectives. Equipment is sized around actual design demand rather than isolated assumptions.
BIM-First HVAC Engineering
HVAC systems are developed within a coordinated digital environment using BIM. Equipment, ducts, piping, shafts, plant spaces and service routes are designed with spatial constraints and access requirements visible from the beginning.
Simulation & Design Validation
We use tools such as HAP, CFD and energy modelling to validate design decisions before construction. Airflow behaviour, thermal conditions and system performance can be evaluated digitally to identify opportunities for optimisation. Desapex's documented technology stack includes Revit, HAP, CFD, EnergyPlus and Navisworks.
Multidisciplinary Digital Coordination
HVAC models are coordinated with architectural, structural, electrical, plumbing and fire protection systems to identify spatial conflicts early. The result is a more coordinated design package with stronger continuity between engineering intent and project delivery.
Core Deliverables
Cooling & Heating Load Calculations
Detailed HVAC load calculations using HAP to determine building cooling and heating requirements and support accurate system sizing.
HVAC System Selection & Equipment Sizing
Evaluation and sizing of HVAC equipment based on building loads, occupancy, operating requirements, energy performance and project objectives.
Chilled Water System Design
Engineering of chilled water distribution systems, equipment requirements, system configuration and coordinated routing for efficient cooling delivery.
Duct Design, Sizing & Routing
Air distribution design including duct sizing, routing, layout development and spatial coordination for efficient and constructible HVAC systems.
Ventilation & Pressurisation Design
Design of ventilation and pressurisation systems to support indoor air quality, controlled airflow and project-specific building requirements.
Computational Fluid Dynamics - CFD Analysis
CFD simulations for evaluating airflow distribution, temperature behaviour and environmental performance in spaces where detailed analysis is required.
HVAC BIM Modelling & Coordination
Information-rich HVAC BIM models developed for multidisciplinary coordination, clash detection, design reviews and coordinated project delivery.
Energy Performance Integration
HVAC design decisions can be evaluated alongside whole-building energy performance to support equipment selection, energy conservation strategies and sustainability objectives. Desapex's energy modelling workflow uses simulation as a design tool rather than only as a compliance exercise.
Why Choose Desapex
Engineering and BIM in One Workflow
We connect HVAC engineering calculations directly with BIM-based design and coordination rather than treating modelling as a downstream drafting activity.
Design Validated Before Construction
HVAC systems are digitally evaluated for performance and coordination before reaching the construction stage, helping teams identify design and spatial issues earlier. This is one of the strongest claims in your existing HVAC material. MEP Brochure Landscape
Simulation-Led Decision Making
HAP load analysis, CFD and energy modelling allow engineering decisions to be supported by measurable building-performance data instead of relying only on conventional rules of thumb.
Integrated MEPF Coordination
As a multidisciplinary MEPF and digital engineering organization, Desapex can coordinate HVAC alongside electrical, public health, fire protection, ELV and smart building systems within a common design environment. MEP Brochure Landscape
Lifecycle-Focused Engineering
We consider not only initial system capacity but also energy efficiency, maintainability, operational performance, occupant comfort and long-term building value.
Structured Digital Delivery
Desapex's BIM and information-management capabilities are aligned with ISO 19650 processes, supporting structured collaboration and digital project delivery.
Unique Selling Proposition
HVAC Engineering That Is Designed, Simulated and BIM-Coordinated Before Construction
Desapex combines mechanical engineering, HVAC performance analysis and BIM coordination within a single digital-first workflow.
Instead of designing systems in isolation and resolving coordination issues later, we connect load calculations, system selection, equipment sizing, duct and piping design, CFD analysis and multidisciplinary BIM coordination from the beginning.
The result is HVAC design built around performance, constructability, energy efficiency and lifecycle value not simply drawings and calculations.
Need an HVAC System Designed for Performance not Just Compliance?
Whether you are developing a commercial building, workplace, data center, industrial facility or complex infrastructure asset, Desapex can support your project with BIM-led HVAC design, engineering analysis and multidisciplinary coordination.
Frequently Asked Questions
What is included in HVAC design services?
HVAC design services typically include heating and cooling load calculations, system selection, equipment sizing, ventilation design, duct and piping design, chilled water system design, pressurisation calculations, controls coordination, HVAC BIM modelling and design documentation. Desapex integrates these activities within a digital engineering workflow.
How is HVAC load calculated for a building?
Why is BIM important in HVAC design?
What is CFD analysis in HVAC design?
What is the difference between HVAC design and HVAC BIM modelling?
Does Desapex provide HVAC design from concept to detailed design?
