The air duct calculator, or “ductulator,” is a commonly used tool for designing and installing duct systems. Unfortunately, many designers and technicians receive limited instructions on its correct use.

Give your duct renovators purpose and help them understand why their position is valuable.

Many new self-contained fractional horsepower refrigeration systems will be shipped from the factory with no service access ports.

The certification process involved a thorough review and rigorous evaluation of Nationwide Boiler’s welding procedure by a review team from the National Board.

The proceeds will be split between Make-A-Wish Greater Bay Area and the Randy Rawson Scholarship Program, which is run by the American Boil.er Manufacturers Association.

Condensing boilers save space and time on installation, as installing a condensing boiler is a pretty seamless process for a few reasons.

Hydronic zone systems have proven themselves to be a sustainable heating and cooling option with a longer lifespan, and potential for cost savings.

Emerson announced a new platform of AWEF-compliant condensing units for walk-in coolers to meet the DOE rule.

Condensing units that are exposed to low ambient conditions must have some sort of low ambient control installed on them.

As contractors, we wonder constantly: From quote to quote, why did we win this job but lose that one?

When it comes to training technicians, numerous HVAC contractors have elected to create their own academies, granting them the opportunity to equip technicians with the skills and knowledge that best fit their service models.

Markets in 79 of the approximately 360 metro areas nationwide returned to or exceeded their last normal levels of economic and housing activity in the third quarter of 2015, according to the latest National Association of Home Builders (NAHB)/First American Leading Markets Index (LMI).

Thanks to the prevalent use of online search engines like Google, consumers everywhere are becoming more educated on the products they buy, and HVAC systems are no exception.

Evapco had an exciting fourth quarter of 2017, and they used the 2018 AHR Expo to build upon that success.

Refrigeration systems can become restricted in both their high and low sides for a variety of reasons.

This low-profile condensing unit is designed to maintain a building’s aesthetic by hiding the unit within the building and eliminating the need for outdoor installation.

Selecting the correct air-cooled condenser for an installation is a vital part of ensuring the system operates properly and at peak efficiency.

Most outdoor units will have survived another winter intact, but nearly all will need some routine (or added) TLC to get into game shape.

What happens in the condenser is a direct reflection of what is happening in the rest of the refrigeration system.

There are several reasons why the compressor discharge temperature of a refrigeration system can be high when the condensing temperature is not, and a checklist can help a technician figure out the root problem.

EPA is revisiting a rule that would allow R-410A condensing units to be manufactured indefinitely to service existing equipment.

I hope you see the potential for this formula. It will make your life easier and help you predict changes to blower speed settings with more accuracy and reliability.

The average tech thinks the service department is a giant money maker when in reality it is typically the least profitable part of a contractor’s business.

Before you can fix a leak, you need to find it. That’s where leak detectors come in.

Know what type of detector you are using, know how to use it, and ensure it’s capable of detecting leaks by calibrating it on a regular basis.

Cooling towers offer a proven and cost-effective solution for rejecting heat from condenser water and industrial processes. To maximize the operating cost savings, the fill media must be properly designed and in good condition.

Polymer elements in cooling towers — or entire towers made of composite materials, like Fiber Reinforced Polymer (FRP) — can reduce the weight by up to 50%.

By splitting the absorption process into two steps, lithium bromide solution concentrations are lower in the system, enabling lower hot water temperatures within the generator, lower hot water flow rates, and the elimination of crystallization risk within the chiller.

The HVACR industry was initially surprised by a date-of-install requirement, mandating installation of certain equipment by January 1, 2025, but EPA extended sell-through period to January 1, 2026.

In recent years, the cost of HVAC equipment has increased significantly, and regulatory changes, such as the phase-down of R-410A, will make the new A2L units even more expensive.

The 25 SEER model is a wall mount unit with Wi-Fi capabilities, a silver ion filter, a cold catalyst filter, and a GoldFin anti-corrosive coating.

In today's economy, cost-conscious end users want to extend their HVAC equipment lifespan as long as possible. Regular maintenance on condensing units can help maximize their longevity and performance.

Discover how hydrogen fuel is poised to revolutionize HVAC systems by reducing carbon emissions and easing strain on electric grids, driving the industry toward a decarbonized future.

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

The Coastal Coat Casing Package is now offered as a premium option for the Modine Atherion packaged ventilation system. 

Taking a look at the major concerns around replacing an 80% furnace with a high-efficiency one such as venting requirements, drilling extra holes, and financial costs.

In this episode we talk to Galen Hunt about the Singularity research OS. Galen is the head of Microsoft's OS Research Group and, together with a team of about 30 other researches, has built Singularity. We started our discussion by covering the basics of Singularity: why it was designed, what the goals of the project are as well as some of the architectural foundations of Singularity: software isolated processes, contract-based channels and manifest-based programs. In this context we also looked at the role of the Spec# and Sing# programming languages and the role of static analysis tools to statically verify important properties of a singularity application. We then looked a little bit more closely at the role of the kernel and how it is different from kernels in traditional OSes. In a second part of the discussion we looked at some of the experiments the group did based on the OS. These include compile-time reflection, using hardware protection domains, heterogenerous multiprocessing as well as the typed assembly language We closed the conversation with a look at some of the performance characteristics of Singularity, compatibility with traditional operating systems and a brief look at how the findings from Singularity influence product development at Microsoft.

In this episode we're talking to Linda Rising about retrospectives. We start by defining what a retrospective is and discuss some of the logistics of making it work for software projects. We then look at the different phases of a retrospective. The main part then is a discussion about some of the practices or games that are used to facilitate the retrospective. We conclude the retrospective discussion with destroying some of the prejudices against it and the relationship to process improvement and CMM. At the end of the interview we talk a little about Linda's current interest: how does the brain work?

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.

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 […]

Gernot Starke talks about arc42: an open-source set of templates he developed to document software architecture based on his practical experience with real projects. Also Gernot and host Eberhard then discuss how documenting architecture fits into agile processes and how to find the right amount of documentation for a system. They walk through the different parts of the arc42 templates covering requirements and the context of the system and the solution structure, including building blocks, runtime, and deployment. They discuss tooling, versioning, testing documentation, and how to keep documentation up to date.

Peter Zaitsev explains: avoiding vendor lock-in, judging what databases are bad at, why not to copy the big players, when to "go with the crowd", when to use cloud services vs. running your own infrastructure, and the role of containerization.

Ryan Singer on Basecamp’s “Shape Up” software development process. Basecamp has ditched the backlog and 2-week sprint in favor of solution “shaping” and strategic 6-week projects, using tools like scope mapping, checklists, and hill charts to understand and reduce risk.

Sumit Kumar, Head of Engineering at SHARE NOW talks with Jeremy Jung about creating mapping applications in JavaScript using the Leaflet library.

Ryan Singer, Head of Strategy at Basecamp discusses the mindset and culture behind a successful remote work for engineers. Akshay spoke with Ryan about communication, collaboration and cultural aspects of working remotely.

CEO and security expert Jason Meller discusses modern tech stacks across a variety of programming languages to consider when building your next project or startup.

Chris Riccomini and Dmitriy Ryaboy discuss their book, The Missing Readme, which is intended to be the missing manual for new software engineers. Felienne spoke with Riccomini and Ryaboy about a range of topics that new software engineers might not have..

Omer Katz, a software consultant and core contributor to the Celery discusses the Celery task processing framework with host Nikhil Krishna. We discuss in depth, the Celery task processing framework, it's architecture and the underlying messaging...

In this episode, Varun Singh, Chief Products and Technology Officer at Daily.co, speaks with host Nikhil Krishna about the 30-year evolution of web protocols. In particular, they explore the impact of protocol ossification, which has supported the Internet’s success but also limits the flexibility of evolving protocol suites such as TCP/IP and UDP by constraining future development. Varun points out how the end-to-end principle emphasizes full flexibility for end hosts, but the TCP implementation in the OS kernel as well as in “middle boxes” such as ISPs contributes to the constraints of ossification by blocking certain types of traffic. Further, the development of new protocols is challenging due to the need for backward compatibility with existing protocols. They discuss Google’s efforts – and the challenges it has faced – in working to move the HTTP protocol forward. The role of standards bodies such as the IETF and collaboration between industry stakeholders is crucial for the evolution of internet protocols, requiring a balance between maintaining backward compatibility and introducing new protocols such as QUIC and HTTP/3 to address existing constraints and improve internet performance and security. indeed, QUIC includes features that seek to actively avoid ossification and encourage evolution.