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Latest Blogs
Gas Pipe Sizing Guide: How to Size Natural Gas and LPG Pipework
A practical gas pipe sizing guide using International Fuel Gas Code (IFGC) equations, with metric and imperial units for natural gas and LPG systems.
MEP Design and Estimating: Bridging the Gap
A look at how design and estimating function in MEP projects today, where the process breaks down, and what closing the gap could mean for contractors and engineers.
What Is Air Film Resistance and Why Does It Matter for Load Calculations?
A technical guide to surface air film resistance: what it is, how it forms, and how it affects the thermal performance of your building envelope.
Latest Charts
Ductulator Chart: Practical Guide for Mechanical Engineers (Free Download)
Duct size directly affects noise, energy, and layout, which is why you should use the Ductulator Chart to get it right.
A Guide To Air Duct Pressure Drop Calculation For Optimal HVAC Performance
Discover the science behind efficient HVAC systems! Explore h2x Engineering’s insightful blog on Air Duct Pressure Drop Calculation for optimal airflow design.
Selecting The Right Radiator Size (Chart Included)
Discover the perfect radiator size for your space with our comprehensive radiator size chart. Achieve optimal heating efficiency today.
Latest Formulas
Friction Factor: The Small Coefficient Driving Pressure Drop
If you want to size a pipe or duct accurately, you must calculate the friction factor: a technical, iterative process with multiple variables (Re, material, diameter, temperature). This guide explains the methods and shows you how to apply them, so your pressure drop calculations are always precise.
Ductulator Chart: Practical Guide for Mechanical Engineers (Free Download)
Duct size directly affects noise, energy, and layout, which is why you should use the Ductulator Chart to get it right.
How to Design Underfloor (Radiant Floor) Heating: Step-by-Step Guide
Read our underfloor heating design guide, offering a step-by-step approach to planning radiant systems, including tips, calculations, and more.
Latest Spreadsheets
FREE Pipe Volume Spreadsheet
Access h2x’s free pipe volume spreadsheet to streamline calculations, optimise design, and enhance efficiency in piping projects.
H2X vs Spreadsheets
Since its launch back in 1985, Microsoft’s spreadsheet application Excel has gone on to become recognised as the leading program for the organisation and calculation of data.
Hardy Cross Method – Sizing a Ring Main (FREE Spreadsheet)
Flow rate and friction loss in a pipe network system can be difficult to calculate. When the pipe network is in a ring main (also known as a closed-loop) formation, the calculations are extra difficult.
This difficult calculation is very common for fire hydrant ring main size designs and the ring main design calculations.
Latest Calculators
FREE Water Flow Rate Calculator From @h2xengineering:
Water Flow Rate Calculator Use this free Water Flow Rate Calculator to estimate flow rates from plumbing fixtures…
FREE Heat Loss Calculator From @h2xengineering:
Heat Loss Calculator Use the Heat Loss Calculator to calculate heat loss in any room or building by…
FREE Ductulator From @h2xengineering:
Ductulator Use our free online Ductulator to calculate velocity, pressure drop, Reynolds number, and friction factor based on…
Resources
Gas Pipe Sizing Guide: How to Size Natural Gas and LPG Pipework
A practical gas pipe sizing guide using International Fuel Gas Code (IFGC) equations, with metric and imperial units for natural gas and LPG systems.
MEP Design and Estimating: Bridging the Gap
A look at how design and estimating function in MEP projects today, where the process breaks down, and what closing the gap could mean for contractors and engineers.
Heat Load Calculation Software: Why Engineers Are Moving Beyond Trane TRACE and Carrier HAP
Legacy heat load calculation software like Trane TRACE and Carrier HAP no longer fits the modern engineering workflow. Here’s what a genuine alternative actually looks like.
Air-to-Water Heat Pump Retrofit: 4 Scenarios Where AWHPs Shine
Not every building is ready for a heat pump, but some are perfect for one. Here’s how to identify the retrofit scenarios where air-to-water heat pumps deliver their full potential.
Calculating Heating and Cooling Loads: What’s the Difference?
Calculating heating and cooling loads requires understanding two opposite problems: heat gain in summer and heat loss in winter. Both must be accounted for in every complete HVAC system design.
Why Revit Falls Short for Design Engineers
Revit handles modelling and documentation well, but design engineers still need better calculation tools.
What Is the Revit Tax? How Autodesk’s BIM Platform is Eating Your MEP Margins
The hidden MEP workflow cost that’s eating your profit, and how to get it back.
You Were Hired to Deliver BIM. Revit Alone Won’t Get You There.
Why the path to true MEP information modeling runs alongside Revit — not deeper into it.
h2x: The Smartest Hevacomp Replacement for Design Engineers
With Hevacomp reaching end of life on January 1st, 2026, building services and MEP engineers need a modern replacement. This in-depth comparison of h2x and OpenBuildings Designer covers speed, calculation accuracy, collaboration, onboarding, and support, so you can make the right call for your team.
Stop Over-Engineering: How Right‑Sizing Saves MEP Projects Money and Resources
Each time an architect changes the plans, engineers face a decision: spend days recalculating everything, or just make the systems bigger and get on with it. Most take the easier route, and it quietly costs the project more than it should.
How h2x Eliminates The Spreadsheet Burden
A wall shift, added bathroom, or layout tweak can invalidate an entire spreadsheet pack. Learn how h2x design software removes the manual recalculation cycle, keeps data consistent, and speeds up revisions without guesswork.
Why h2x Is the Natural Successor to Hevacomp — And Why Engineers Should Make the Switch Now
What is more dangerous to an engineering firm: a software that doesn’t work, or a tool that still does? On January 1, 2026, Hevacomp became a ‘ghost platform’: functional but dangerously outdated. Sticking with this legacy system isn’t playing it safe; it’s gambling your compliance, accuracy, and reputation.