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Cherry
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.
RTU HVAC for Commercial Buildings: How to Select, Buy and Maintain a Rooftop Unit
An RTU HVAC system is a facility decision. A commercial rooftop unit must account for the load, airflow, outdoor-air requirement, roof curb, utilities, controls and service plan all at the same time. This resource provides a path for facilities teams…
Water-to-Water Heat Pumps: How They Work, Types and Costs
A Water-to-Water Heat Pump system moves heat between a source-water circuit and a building’s hot or chilled-water circuit. It’s appropriate for sites with accessible water or ground-loop heat sources and hydronic distribution. The practical test is whether that source, the…
Heat Pumps vs Boilers in Commercial Hydronic Heating: Supply Temperature, Break-Even COP, and Retrofit Sizing
Legacy commercial non-condensing boilers supply 70°C to 82°C (158°F to 180°F) hot water with return temperatures above 60°C (140°F), whereas standard commercial air-to-water heat pumps supply 35°C to 55°C (95°F to 131°F) hot water—or 55°C to 75°C in two-stage cascade…
Cold Climate Heat Pump Guide: How Winter Performance Works
By Cherry · Updated October 2026 A Cold Climate Heat Pump draws heat from the air to heat a building in cold weather. Its circuitry and controls let it operate in wintry conditions, as does its defrost system. The useful…
Ground-source Heat Pump Guide: How It Works, Types and Trade-offs
Ground-source Heat Pump: Is It Right for Your Site? A Ground-source Heat Pump uses the ground as a heat source in winter and a heat sink in summer. Ground temperature is more stable than outdoor air temperature. The commitment is…
Water-Source Heat Pump Commissioning, Controls & Troubleshooting Guide
Updated: October 13, 2026 A water-source heat pump is a reversible refrigeration unit that exchanges heat with a circulating water loop. That defines the unit. Loop operation requires a heat sink or source. There needs to be sufficient flow of…
Water-Cooled Chiller Maintenance: An Annual Evidence-Based Checklist
Updated: October 13, 2026 Water cooled chiller maintenance is the controlled process of recording condition, context, ownership, and closure for a water-cooled chiller; unlike maintenance procedures for air cooled chillers, the chiller’s water-side evidence must remain visible. A working program…
Air-to-Water Heat Pump: A Practical Hydronic Systems Guide
Updated: October 9, 2026 An Air-to-Water Heat Pump is a hydronic system that takes heat from outdoor air and delivers it to a water circuit. The technology is simple, but the project decisions are not. Useful results depend on the…
Industrial & Commercial Heat Pumps: A Practical Systems Guide
Industrial & Commercial Heat Pumps are systems that move useful heat from a lower-temperature source to a higher-temperature sink by adding mechanical work. That definition is simple. Dependable project design isn’t. Building schedules, process temperatures, source availability and distribution, controls,…
Top 20 AHU Manufacturers: Who Is Best for Which Project?
Last updated: September 2026 The best air handling unit manufacturers include Koven Air for flexible project-built configurations, Haakon for custom institutional units, Trane for broad commercial selection tiers, Swegon for ventilation with heat recovery, and Munters for industrial humidity control.…
