Why Condensation Forms on One Wall but Not Another: Dew Point and Surface Temperature
One wall can condense moisture while another stays dry because its surface temperature falls below the dew point of adjacent indoor air. Thermal.
Testo 558s Setup Guide: Superheat, Subcooling and Common Errors
The testo 558s measures refrigeration-system pressure and, with the required temperature sensors and correct refrigerant selection, supports superheat.
Infrared Thermometer Calibration Certificates: What to Check
A calibration certificate describes a comparison of an infrared thermometer against defined references under specified conditions. It is not a.
How to Measure Negative Pressure in HVAC Systems: Reference Points, Testing Steps and Limits
Negative pressure means one measured location is at a lower static pressure than the location used as the reference. Measure the difference with the.
How to Use a Carbon Monoxide Tester for Ambient Air Checks: Safe Steps and Reading Tips
Use a suitable ambient CO meter to measure carbon monoxide in room air, not the concentration inside a flue. Record instrument status and the.
HVAC Flow Hood Measurements: Setup, Errors and Best Practices : Check the hood seal before trusting
Use a flow hood to measure volumetric airflow at a supply or return outlet, then compare the reading with the system’s design and balancing data. A.