HVAC

Welcome to the HVAC section of BuildMEP.com – your go-to resource for practical knowledge, tools, and guidelines related to Heating, Ventilation, and Air Conditioning systems in the MEP industry.

This category is designed to support MEP engineers, HVAC technicians, consultants, and project managers with a wide range of technical content and field-ready solutions. Whether you’re involved in design, installation, commissioning, or maintenance, you’ll find helpful resources to streamline your work and stay updated with the latest standards.

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Count Blocks AutoCAD LISP illustrated workflow: select a block and place its count in the drawing.

Mohamed Suhail-

October 10, 2026

Count Blocks AutoCAD LISP: Free Download & Usage Guide

Free AutoCAD LISP to count blocks by clicking one instance — no typing names. Unlike BCOUNT, the result stays permanently...

AutoCAD block count LISP (MEPCOUNT) – table counting MEP blocks by name and layer, with Excel CSV export

Mohamed Suhail-

October 7, 2026

AutoCAD Block Count LISP: Free MEP Block Counter with Excel Export

Free AutoCAD LISP that counts every block in a selection, groups them by name or layer, handles dynamic blocks and...

BuildMEP VRF vs chilled water guide cover showing VRF outdoor units and a chilled-water chiller beside a high-rise building.

Mohamed Suhail-

October 4, 2026

VRF vs Chilled Water for High-Rise Buildings: How Engineers Choose

BuildMEP HVAC design guide VRF or chilled water is one of the first big decisions on a commercial or high-rise...

BuildMEP cover for “Combustible Gas Detectors: Why They Fail,” showing a fixed gas detector connected to a test gas cylinder.

Mohamed Suhail-

September 23, 2026

Combustible Gas Detectors: Why They Fail in the Field and How to Keep Them Reliable

BuildMEP fixed gas-detection field guide Use this guide to diagnose unreliable combustible-gas detectors and to verify the complete path from...

Generic linear actuator mounted on a cutaway PICV with indicators for checking stroke, force, signal and mounting compatibility.

Mohamed Suhail-

September 20, 2026

Commercial Kitchen Ecology Unit: Selection, Sizing, Installation and CAD Drawing

Siemens SAX61.03 and SAX81.00 share some electrical characteristics with Frese 53-1296 and 53-1297 actuators, but current manufacturer documents do not...

FCU condensate drain pan and overflow protection above a critical electrical room

Mohamed Suhail-

August 24, 2026

FCU Drain Tray Maintenance: The PPM Checklist Gap That Actually Causes Failures

BuildMEP critical-facility maintenance guide This guide shows how to inspect and functionally test an FCU condensate system, how to add...

A2L refrigerant safety guide showing an indoor HVAC unit, leak detector, airflow and refrigerant pipe riser

Mohamed Suhail-

August 21, 2026

Pre-Insulated Ductwork for Renovation: Selection, Site Fabrication and QA Guide

A practical engineering guide to selecting and fabricating pre-insulated HVAC ductwork for renovation projects. Covers system approval, PID vs insulated...

Rectangular duct elbow, transition and offset geometry being checked before fabrication

Mohamed Suhail-

August 21, 2026

Duct Fitting Geometry: Elbow Radius, Transition Angle and Offset Checks

Check rectangular-duct elbows, transitions and offsets before fabrication. Define the radius correctly, calculate the required transition length, lay out the...