TTT Free Downloads

A Guide to Combustion Analyzers 2025 Edition by TruTech Tools

This free guide written by Eric Kaiser explains how to properly perform combustion testing in homes etc.

Total External Static Pressure Testing Guide

This free guide details how to perform TESP (Total External Static Pressure) testing on different systems and the best tools to use.

Enthalpy Chart in BTU per Pound of Dry Air

This free enthalpy reference chart goes down to the tenths of a degree fahrenheit based on ASHRAE data.

Quick Chart for Rectangular Duct Traverse

This free chart details the size requirements for traversing different types of rectangular ducts.

A/C Commissioning Test Worksheet

Fill out this A/C performance worksheet and use the equations to calculate the expected system performance.

A/C Heat Pump System Troubleshooting Guide

A general guide to troubleshooting A/C heat pump systems.

Charge and Airlflow Check Sheet

Fill out this airflow verification sheet and use the equations to calculate the expected airflow in CFM.

A Guide to Combustion Analyzers 2007/2010 Edition by TruTech Tools

This free guide written by Jim Bergmann explains how to properly perform combustion testing in homes etc.

Copper Tube Bending Diameter Chart

Learn the process of measuring for inside (I) or outside (O) dimensions and finding the die-center of copper tubing.

The Building "Science" Timeline

An illustrative look back through the history of building science and how we arrived at todays standards.