HEAT LOAD
CALCULATION
HVAC Design Desk
Online HVAC Consultancy
Practical HVAC engineering for better building design.
HVAC Design Desk combines three decades of engineering experience with calculation-based design tools built for real engineering applications
30yrs
Engineering experience
ISHRAE
Based design data
8+
Calculation Tools
DWG-HDD-001
NOT TO SCALE
About
Core Engineering
HVAC Design Desk was established to provide practical, calculation-driven HVAC engineering support to architects, contractors, building owners and users.
The consultation is backed by three decades of HVAC design and engineering experience — spanning residential, commercial, hospital, hotel, retail and industrial projects. Every recommendation is grounded in a calculation, not a rule of thumb.
30
Years of hands-on HVAC design and engineering, now offered as an online consultancy.
01
Calculation-based design — heat load, psychrometrics, duct and pipe sizing.
02
ISHRAE-referenced data used across load estimation and equipment selection.
03
Independent review of HVAC calculations and drawings already designed.
04
Designing HVAC system directly from architectural drawings.
View Our Services
HVAC design, distribution, and verification.
HVAC Design & Calculations
- Heat Load Calculation with ISHRAE database
- HVAC System Design
- Psychrometric Analysis
- AHU Capacity & Selection
- Equipment Selection
Air Distribution
- Duct Design
- Airflow & Velocity Calculations
- Pressure Drop
- Fan Static Pressure
Chilled Water Systems
- Chilled Water Pipe Sizing
- Pump Head Calculation
- Pump Selection
- Chilled Water System Analysis
Specialist HVAC Systems
- Cleanroom HVAC Design
- Staircase Pressurization
- Lift Lobby Pressurization
- Lift Well Pressurization
- Smoke Extraction
- Fresh Air & Ventilation
Design Verification & Consultancy
- Independent HVAC Design Review
- Heat Load Verification
- Equipment Selection Review
- HVAC Coordination Review
- Design from Architectural Drawings
For Architects
HVAC decisions shouldn't become a problem after the architectural design is finished.
We help architects evaluate the HVAC impact on a plan while it can still be changed cheaply.
- Plant room requirements
- AHU room requirements
- Shaft sizes
- Duct routing requirements
- Ceiling-space requirements
- Fresh-air requirements
- Smoke extraction provisions
- Staircase / lift pressurization
- Equipment space
- Service access
Before Design Freeze
The cost of fixing a wrong HVAC design rises sharply once the layouts are frozen. Bring us in early and we'll flag the impact on your plan in days, not weeks.
Discuss HVAC Requirements Before Design Freeze →HVAC Design Support for Architects
At every stage.
- HVAC zoning
- Plant room planning
- Shaft requirements
- Preliminary cooling load
- Equipment space
- Service access
- Duct routing
- Ceiling coordination
- AHU room planning
- Fresh-air requirements
- Pressurization
- Smoke extraction
- Heat load
- Equipment selection
- Duct design
- Pipe sizing
- Pressure drop
- System verification
Explore HVAC Tools
Free HVAC design tools.
Practical, calculation-driven engineering tools built for engineers and architects.
💧
Pipe Sizing Tool
Chilled-water pipe sizing and hydraulic calculations.
💨
Duct Sizing Tool
Duct sizing, velocity and pressure-drop calculations.
🌡
Psychrometric Tool
Psychrometric analysis for HVAC system design and air-conditioning processes.
🔥
Heat Load Tool
Building cooling-load calculation with ISHRAE-based design data.
Coming soon⚙
Pump Head Tool
System pressure-drop and pump head calculation.
Coming soon🌀
Fan Static Pressure Tool
System resistance and fan static pressure calculation.
Coming soon🏢
Lift Lobby Pressurization
Pressurization airflow and system calculations.
Coming soon🚪
Staircase Pressurization
Staircase pressurization design calculations.
Coming soonIndependent HVAC Design Review
Already have an HVAC design?
We independently review the engineering calculations and design assumptions behind an existing HVAC design starting from heat load to subsequent design phases — and report back on where it holds up and where it doesn't.
Request a Design ReviewDiscuss Your Project
Tell us about the project.
Share a few details and, if you have them, your drawings. We'll confirm receipt by email and revert with next steps.
Direct Contact
Prefer email?
Send drawings and a short brief directly — we'll confirm receipt with an enquiry number.