Air handlers are the heart of an HVAC system, moving the conditioned air through a building. Like a heart, they can generate a lot of noise while operating. Manufacturers, however, are taking steps to reduce that noise.

This is a great industry. We need to keep spreading the word. Features (like this) with such wide readership are a huge help. I think that mentorship and participation in national organizations also provide a camaraderie that many women don’t find in the day-to-day.

Uncover why change is vital in the HVAC sector and how embracing growth can significantly spark new momentum for your home improvement business.

Supermarkets and grocery stores are facing challenging times as the $1.2 trillion annual sector strives to maintain its relevancy in a sea of change.

Refrigerant regulations are another reason why change is coming, as HCFCs will be phased out by 2020, and given their high global warming potential (GWP), HFCs will likely be phased down in the near future as well. At some point, supermarkets will need to start considering low GWP alternatives such as HFO blends, as well as so-called “future-proof” refrigerants such as ammonia, CO2, or propane.

Chillers are being used as heat pumps, outfitted with heat-recovery systems, used in building electrification projects, and installed in arrays to cool data centers.

While “smart” tools and tablets are becoming more and more common in an HVAC tech’s toolbox, there are still plenty of things an app just can’t do.

The 8 CFM Vacuum Pump from Fieldpiece Instruments earned its place atop the Electronic and Hand Tools category.

Technicians have the choice of using either a digital or mechanical manifold gauge. Each one has its benefits and disadvantages, which is why it may pay to own one of each kind.

Programmable thermostats that can be accessed through an internet device are old hat. Here are just a few of the residential HVAC controls products featured at the Georgia World Congress Center, the host venue for this year’s Expo.

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.

Soap bubbles have long been thought of as the standard method for leak detection, but times, and technology, are changing.

When changing the refrigerant within your pumping application, it is worth discussing the application with a process specialist.

Posted by Xen . org security team on Nov 12

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.

Corporate America is making pledges to take action against climate change, which is opening up opportunities for HVAC contractors.

SD900 and SD910 three-channel DC current and DC voltage dataloggers are optimized for extended monitoring of milliamp (SD900) and millivolt (SD910) signals throughout a commercial, industrial, or residential facility.

Summer cooling season is in full gear, which means that both technicians and their tools are being kept extremely busy.

Learn how HVAC companies can increase retention by giving their employees a stake in the company’s success through phantom stock plans.

With stronger global temperature fluctuations and demand for HVAC systems growing, heat exchangers are rapidly becoming essential to an ever-expanding market.

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.

HiberSense Inc. appointed Chris Lawson as channel sales manager for the U.S. market.

Zoning technology has experienced success in both residential and commercial applications of hot water and hydronic systems.

This e-book includes a summary of sustainable HVAC developments, in particular of heat pumps and refrigerant changes to address climate change.

Industry experts are telling contractors to stay informed and get involved with the new regulations that are likely to impact everyone this coming year

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

This week, Arno and Markus take a look at error handling at the architectural level. They discuss the different kinds of errors, the groups of people who need to know about them and proven high-level approaches. Later episodes will investigate more technical aspects of error handling, such as idioms for using exceptions or a discussion of checked vs. unchecked exceptions.

This episode provides a hands-on guided tour through a simple model-driven software project. It is based on an actual code sample (see link below) and takes a look at the typical steps of real-life code generation: prototypical implementation, defining the metamodel, reading a model into a metamodel instance, writing templates and validating the model. The example for the episode uses openArchitectureWare as a generator environment, but the overall approach is tool independent. This episode is the first in a new category "code/technology" that discusses technical concepts based on actual code. Please give feedback whether you find this format useful or not.

In this Episode, Arno and Michael take a closer look at Exceptions and Error conditions, how to categorize them and how to deal with them. We look at the different levels of guarantee that a piece of code can provide with regard to exceptional condition and finish with a discussion of a number of best practices and their respective trade-offs.

In this Episode we discuss fault tolerance based on the new book by Bob Hanmer. This is the actually the first part of the discussion, the remainder will be published in the next episode of SE Radio. We start by discussing some of the context for fault tolerant systems and the imperfect world assumption. We then discuss a number of terms we will need when discussing the fault tolerance patterns. We then discuss the fault tolerance mindset and connect fault tolerance to a number of related subject areas, such as software quality. We then discuss the shared context for the patterns that follow, among them the important observation that fault tolerance does not come for free! Finally we provide an overview over the different sections covered in the book and start the detailed discussion of the patterns by looking at the Architectural Patterns section. The next episode will discuss the remaining patterns in the book.

This is the second part of the discussion on fault tolerance with Bob Hanmer (if you didn't listen to Episode 77, which contains part one, please go back and listen now; this episode builds on that previous one!) We start by discussing a set of error detection patterns. Among are the well-known approaches such as checksums and voting. We then look at error recovery patterns, including restart, rollback or roll forward. The next section looks at error mitigation patterns, which include shedding load and doing fresh work before stale. The last patterns section then looks at fault treatment patterns. We conclude the episode with a small discussion about how to design systems using (these and other) patterns, and with some thoughts on why actually wrote the book.

This episode is once again with Linda Rising, this time on the book she coauthored with Mary Lynn Manns on introducing ideas into organizations. The talk is another one of the SE Radio Live sessions recorded at OOP 2009 - thanks to SIGS Datacom and programme chair Frances Paulisch for making this possible.

This episode is a discussion with Shane Clifford, who is a development manager at Intentional Software. We discuss the idea behind intentional programming, key concepts of the technology as well as example uses and a little bit of history.

Our guest Johan Bezem explains the idea behind and the benefits of MISRA. MISRA defines guidelines for C and C++ programming in order to ensure quality. While it got started for embedded automotive development, it is more generally applicable.

In this episode Johannes Link interviews Lasse Koskela - the author of "Test-Driven" - about test-driven development (TDD). We cover the basics, the rationale behind it and the challenges you face when doing it in more difficult environments.

Cassandra is a distributed, scalable non-relational data store influenced by the Google BigTable project and many of the distributed systems techniques pioneered by the Amazon Dynamo paper.

Martin Thompson, proprietor of the blog Mechanical Sympathy, founder of the LMAX disruptor open source project, and a consultant and frequent speaker on high performance computing talks with Robert about computer program performance. Martin explains the meaning of the term “mechanical sympathy,” derived from auto racing, and its relevance to program performance: the importance of […]

Guest Udi Dahan talks with host Robert Blumen about the CQRS (command query responsibility segregation) architectural pattern. The discussion begins with a review of the command pattern. Then a high-level overview of CQRS, which consists of a separation of a command processing subsystem that updates a write model from one or more distinct and separate, […]

Nathan Marz is the creator of Apache Storm, a real-time streaming application. Storm does for stream processing what Hadoop does for batch processing. The project began when Nathan was working on aggregating Twitter data using a queue-and-worker system he had designed. Many companies use Storm, including Spotify, Yelp, WebMD, and many others. Jeff and Nathan […]

David Heinemeier Hansson, creator of the Ruby on Rails framework and a partner at the software development company Basecamp, talks to Stefan Tilkov about the state of Ruby on Rails and its suitability for long-term development. He addresses some of its common criticisms, such as perceived usefulness for only simple problems, claimed lack of scalability, and increasing complexity. David also talks about the downsides of building JavaScript-centric, “sophisticated” web UIs, and why he prefers well-structured, “majestic” monoliths to microservices.

Nate Black talks with Jonathan Stark about platforms for mobile development, making decisions about how to develop mobile apps, how to deploy mobile apps, native apps vs. progressive web apps, React Native, and the future of mobile applications.

Bryan Reinero talks with Jason Hand about handling outages and responding to failures. The episode explores basic problem-solving strategies and diagnostic techniques, organizing teams to address incidents efficiently, communicating with stakeholders, learning from incidents, and managing stress.

Edaena Salinas talks with Stephen Ewen about streaming architecture. Stephen is one of the original creators of Apache Flink. Topics discussed: stream processing vs batch processing, architecture components of stream architectures, Apache Flink...

Travis Kimmel talks with Johnathan Nightingale about scaling engineering management. Their discuss when to hire additional engineering managers and how to set them up for success, how leaders can prepare for “growing pains” as an organization scales,

Jonathan Boccara, author of The Legacy Code Programmer’s Toolbox discusses understanding and working with legacy code. Working with legacy code is a key skill of professional software development that is often neglected.

Michael Chan has been teaching React since 2013 and is the host of the React Podcast. He currently works at Ministry Centered Technologies as a Frontend Architect.

Abhinav Asthana, a founding partner and CEO of the API development tool Postman, discusses API design and testing, where to start, which types of APIs to offer, what tools you can use, what features to expose and what is his favorite API to reference.

Scott Hanselman discusses .NET with Jeremy Jung

Liram Haimovitch talks about how a business handles customer issues with a software product. How issues start out with a dedicated customer-facing team and when they may be escalated to engineering.