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I write about air handling and humidity-control equipment for commercial projects. My contributions compare air handling unit manufacturers and explain how desiccant dehumidifiers work. I focus on the application questions behind a shortlist, such as airflow, moisture target, configuration, and the conditions used to describe performance.
Desiccant Dehumidifiers: A Practical Guide to How They Work
Updated September 2026 Desiccant dehumidifiers are air-treatment systems that remove water vapor by transferring it to a moisture-attracting material, then regenerating that material so the cycle can continue. These systems are especially useful when air is cold, dew-point requirements are…
Dry Cooling Coils: Design, Control, Commissioning and Maintenance
Dry cooling coils are indoor, forced-circulation air-to-water coils selected to remove sensible heat without planned condensation. They operate only when the coldest active coil surface stays above the applicable air dew point for each operating case. Warmer water can help,…
Packaged Rooftop Units: From Design Brief to Replacement
Commercial HVAC owner guide Packaged rooftop units are factory-assembled HVAC cabinets. Door and roof interfaces, ventilation, control sequences, acceptance tests and service records must be aligned as well. This guide follows the process from the first design brief through the…
Scroll / Screw Chiller Guide: 7 Load-Profile Checks (2026)
Updated September 2026 · Informational guide for engineering, procurement and operations teams A Scroll / Screw Chiller is a package identified by a scroll or screw compressor. Comparing the two is a compressor-architecture decision, not a universal “good” or “bad”…
Modular Chiller Guide: Staging, Controls & Redundancy
In brief. A modular chiller is a smaller water-chilling package designed to work with other modules on a common chilled-water system. The modules create useful options, but the installed plant still depends on project-condition capacity, minimum flow, pumps, power, sensors,…
Centrifugal Chiller Guide: How It Works, What Ratings Miss, and What to Measure
A centrifugal chiller is a water-cooled vapor-compression machine that removes heat from chilled water by circulating refrigerant through an evaporator, a high-speed centrifugal compressor, a condenser, and an expansion or metering device. Operating conditions are also affected by pumps, cooling…
Hydronic Fan Coil Unit Guide for System Design and Operation
Updated August 2026 A Hydronic Fan Coil Unit is a room terminal that moves air across a hot- or chilled-water coil. That simple description hides the decisions that determine whether the installed system is quiet, dry, controllable, and able to…
Commercial Cassette Air Conditioner: The 2026 Guide to DX/VRF and Hydronic Cassette Systems
A commercial cassette air conditioner is a ceiling-recessed HVAC terminal that distributes conditioned air through a flush grille. The name covers two different systems: DX/VRF units connected by refrigerant piping and hydronic fan coil units connected to a central chilled-…
Concealed Fan Coil Unit Guide: 7 Design Checks Before Specification
Concealed Fan Coil Unit Guide: 7 Design Checks Before Specification Fan coil unit guide A concealed fan coil unit can keep the ceiling clean and the room quiet, but only when the ceiling void, duct path, drain route, controls, and…
Lithium Battery Dehumidifier: The Complete Guide to Dry-Room Moisture Control Equipment
Updated July 2026 Quick Specs Typical dew point range -40°C to -70°C, depending on process step Typical relative humidity Below 1% RH Room temperature (cell assembly) 22°C ± 2°C Core technology Desiccant (adsorption) dehumidification — rotary wheel or liquid desiccant…
