AHRI launched an interactive US map showing state codes for A2L refrigerants, alongside a video series on low-GWP refrigerant transition.

“While the recent news is a formality, it makes the victory over these burdensome regulations official."

Not only has VRF technology been widely accepted by contractors and end users alike, virtually every major U.S. manufacturer is now offering these systems, as well.

Once only found in mild climates, the technology now stretches across the U.S., thanks to advances in inverter technology and zone controls. On the other hand, the level of sophistication in these systems sometimes makes them difficult to troubleshoot when something goes wrong.

The equipment in this month’s troubleshooting situation is a split system that has only been in service for two years, but there is a lot of history — several service calls since the equipment was installed, and an on-going complaint that the system just doesn’t keep the ranch-style home comfortable.

The equipment in this month’s troubleshooting situation is a split system that has only been in service for two years, but there is a lot of history.

Most of the rest of the world has relied on ductless mini-split systems for their heating and cooling needs for decades, but that has not been the case in the U.S. That may be changing with the advent of ducted mini-split systems.

We often humidify and dehumidify as part of our work, but let’s take a different look at what happens when we do that.

As HVAC providers, we have the ability to advise homeowners, builders, and property managers on ways to improve their indoor air quality.

Four core components work together to control when refrigerant is absorbing heat, and when it is releasing heat.

The proper application of modern HVAC technologies can help maximize indoor air quality while minimizing losses in operational efficiency.

Economizers used in rooftop units and air handlers are multipurpose devices that can improve both the energy efficiency and indoor environment in a wide range of commercial buildings.

Aircuity has been named a New York State Energy Research and Development Authority Qualified Vendor for the RTEM program.

Honeywell announced the launch of Honeywell Forge Energy Optimization, a cloud-based, closed-loop, machine learning solution.

When it comes to smart thermostats, USACD walks the walk and talks the talk.

BrainBox AI intends to integrate ABB’s MSR business and its installed base of 12,000-plus retail locations in its current operations.

Commercial building codes are mandating higher volumes of fresh-air intake than ever before. To help meet these ventilation requirements, more and more HVAC contractors and building owners are turning to dedicated outdoor air systems (DOAS). 

Nortek Global HVAC has introduced a new three-phase electric/electric packaged cooling solution. The company said the Model P8SE delivers 14 SEER cooling in capacity ranges from 3 to 5 tons in even tonnages, making it an energy-efficient choice for strip malls, restaurants, and retail stores.

HVAC contractors in different climates and regions all over the U.S. agree that irregular upkeep is the most problematic issue when it comes to rooftop unit failure.

This series of residential package equipment features energy-saving performance as well as cost-effective installation and maintenance.

The units feature an exact-fit replacement design that matches the units to footprints of other manufacturers’ units and eliminates the need for a curb adapter.

Posted by Jose Dominguez via Snort-sigs on Oct 22

Posted by Joel Esler via Snort-sigs on Oct 23

People are still pinching pennies and choosing repairs, but there are ways for contractors to sell new equipment, even when it’s more expensive.

NASRC has launched a workforce development program that focuses on recruitment, training, and retention, in order to combat the critical shortage of refrigeration technicians. 

If used correctly, AI can potentially enhance efficiency and accuracy across multiple industries, including HVACR.

Homeowners likely won’t choose to replace unless it’s cheaper than the repair.

Today’s commercial structures are full of sophisticated controls that have been changing building automation systems exponentially.

Daikin Applied’s recently introduced SiteLine Building Controls gives building owners and operators the tools and insights needed to optimize performance, improve IAQ, and trim energy use and carbon emissions.

CABA was founded in 1988. As ASHB, its mission — to empower connectivity among people, spaces, and technology to deliver a more livable, sustainable, and efficient connected world — remains unchanged.

The Copeland-Enersponse collaboration offers a chance for food retailers to improve energy conservation efforts through involvement in demand-response initiatives that assist in stabilizing the power grid during times of high electricity consumption.

Building automation systems can boost heating and cooling efficiency by more than 20%.

When it comes to this piece of critical infrastructure, operators need to be prepared to face new and sophisticated attacks.

For residential HVAC contractors, smart homes are a fast-growing market that offers opportunity for profit.

With cost reduction, sustainability enablement, increased comfort and performance benefits, VRF systems allow commercial buildings to gain a competitive advantage by reducing their carbon footprint and providing custom comfort to occupants.

Heat pump sales may look like they are slowing down, but research shows they are picking up speed.

To meet the ambitious environmental goals being proposed at all levels of government, residential air-to-water heat pumps are emerging as a transformative solution to lower carbon emissions, enhance energy efficiency, and reduce utility bills.

As more homeowners are ditching oil heaters and moving to heat pumps, the rest of the country can learn from the cold-climate success story.

All-electric options have come a long way since their inception, and there’s never been a better time to get on board.

This new private-public partnership wants to quadruple heat pump installation in California over the next 6 years.

Despite the arguments regarding the practicality of heat pumps in cold climates, residents of Maine have fully embraced them.

Any furnace with induced draft combustion may occasionally exhibit unburned gas odor near the furnace in the off cycle.

The ACHR NEWS visited Flame Furnace in Warren, Michigan to learn how to do maintenance and basic troubleshooting on a furnace.

Using water to transfer heat energy into the home can minimize or even eliminate the issues of dry air and loud operation.

Posted by Dave Aitel via Dailydave on Sep 30

In this episode we take a brief look at Jetbrains' Meta Programming System, a language workbench for creating external DSLs or for extending existing languages (such as Java). In a brief telephone discussion, Konstantin Solomatov explains what the system does and how it works. The system has recently been released into public beta and will be made available under then Apache 2.0 Open Source license.

This is another episode recorded at OOP 2009, thanks to SIGS Datacom and programme chair Frances Paulisch for making this possible. Here is the abstract from the conference program: Many software systems have fragile architectures that are based on brittle assumptions or rigid architectures that reduce options and make change difficult. On the one hand, an architecture needs to be fit for the present day, suitable for immediate use, and on the other it needs to accommodate the future, absorbing reasonable uncertainty. However, an approach that is overly focused on today's needs and nothing more can create an inflexible architecture. An approach that becomes obsessed with possible future changes creates an overly complex architecture that is unfit for both today's and tomorrow's needs. Both approaches encourage an early descent into legacy for a system. The considerations presented in this talk reflect an approach that is more about thinking in the continuous present tense than just the present or the future tense. This includes principles from lean thinking, practices common in agile processes and techniques for loosely coupled design.

In this episode, Markus talk with Martin Fowler and Rebecca Parsons about domain-specific languages.

Recording Venue: Phone Guest: Jeff Frey System z, or the Mainframe, holds most of us in awe — the ultimate computing platform, referenced in Hollywood as well as by those who thought they were dealing with “legacy” systems — but what does Mainframe really mean? What does its stack look like? This leading virtualized infrastructure […]

For Episode 200 of Software Engineering Radio, Diomidis Spinellis interviews Markus Völter, the podcast’s founder. Markus works as an independent researcher, consultant, and coach for itemis AG in Stuttgart, Germany. His focus is on software architecture, model-driven software development and domain specific languages as well as on product line engineering. Markus also regularly publishes articles, […]