an

Don’t Overlook Cleaning the Evaporator Coil 

Cleaning evaporator coils in a walk-in cooler can be challenging, but it needs to be done in order to keep the system operating efficiently.  




an

Are Geothermal Heat Pumps the Key to a Cleaner Planet?

Geothermal energy can be used to heat and cool commercial buildings. The highly efficient systems that make this possible are geothermal heat pumps.




an

Integrating the Advantages of Geothermal Into an HVAC Company

Geothermal heat pumps tap into a renewable source of energy to provide comfort for a home, and HVAC contractors can tap into this market for increased sales.




an

Manufacturers Help Contractors Keep up with Heat Pump Technology as Market Grows

Manufacturers and contractors are working to educate end users about the ways heat pumps work differently from traditional heat sources.




an

Geothermal Offers an Opportunity for HVAC Contractors

The moment for geothermal seemed to have arrived several times since the 1970s. A number of factors are forecasting wider use of this type of heating and cooling solution.




an

March 27, 2023 NEWSRoom: Heat Pumps Part of Musk’s Master Plan, AHRI Policy Leadership Award, Enter Top 30 Distributors of 2023

Catch up on the latest headlines in our NEWSRoom video series.




an

Project Files: Episode 61 — All-Electric, Zero-Carbon Michigan Home

This Michigan home is proof that even when achieving high-level green building standards, more can be done to improve sustainability.




an

Geothermal and Decarbonization

Decarbonization and electrification, the refrigerant transition, and incentives were big topics among geothermal companies at the AHR Expo. Consumer education and ease of product serviceability were also discussed.




an

Virginia Passes Geothermal Bill With Major Financial Incentives

The bill significantly reduces the cost of a geothermal installation, spurs job creation, and hopes to inspire more contractors to tap into the geothermal market.




an

Understanding the Use of Suction Filters/Driers

Unfortunately, we can easily forget the role that suction driers can play in protecting the compressor and the compressor oil.




an

Breaking the Code: Controlling Humidity and Particulate to Meet Building Standards

While balanced ventilation does have energy benefits, there is a misconception about its ability to reduce humidity.




an

Guiding Customers through Indoor Air Quality and the Tips to Maintain IAQ

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




an

A Simple Guide to the Refrigeration Cycle and How Air Conditioners Work

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




an

How Can A Direct Drive Design Optimize Cooling Tower Performance?

A variable speed drive (VSD) controls the speed of the high-torque, direct-drive motor for optimal fan operation.




an

The Secret to Energy and Cost Savings: Pump System Evaluation

Determining the right pump to save energy in a given application can be broken down into three general steps.




an

Internet of Things Improves HVAC Efficiency and Effectiveness

IoT-enabled HVAC systems can accommodate a seamless user experience while reducing environmental impact.




an

Upper-Room UVGI: An Infectious Disease Control Strategy

The pandemic has marked a turning point for an underutilized technology for infectious disease control in buildings.




an

Why Changing Refrigerants May Mean Your Existing Pump Needs Replacing

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




an

Understanding the Formula to Calculate BTUH

The "magic number" 1.08 is convenience factor. It is a bunch of math combined into one factor as a shortcut, although sometimes more precise calculation is better.




an

Propane Can Offer HVAC Customers A Reliable Option for Backup Power

The growing electricity demands being placed on the country’s century-old grid are resulting in an increased number of unexpected power outages across the U.S.




an

The 3-4-5 Rule for Walk-In Coolers And Freezers

During the installation of a new walk-in cooler or freezer, it is imperative the box remain square and level during the assembly of its panels.




an

Public Review of Proposed Revisions to ACCA Manual SPS (HVAC Design for Swimming Pools and Spas)

The 30-day ANSI public review period closes May 14.  




an

Harlan is New Business Development Manager at WAGO

Amy Harlan, who has an extensive background in electronics and device connectivity, is the new business development manager for device connection technology at the global electronics technology firm.




an

Defining and Calculating Voltage Imbalance

Saving one compressor will cover the cost of a voltage monitor and then some.




an

Nationwide 250 hp Boiler Achieves 5 ppm NOx Performance

Equipped with an Oilon LN30 ultra-low NOx burner and Nationwide’s Eagle PLC-based Control System, the 250 hp package boiler achieved average emissions performance of 5 ppm NOx and 0 ppm CO (corrected to 3% O2) during third-party testing.




an

H2VAC: Using Hydrogen Fuel to Decarbonize Heating and Cooling

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.




an

Re: shell wildcard expansion (un)safety

Posted by Eli Schwartz on Nov 10

The earliest version of the Bash Pitfalls guide that includes a warning
about the topic, per the Wayback Machine:

https://web.archive.org/web/20090426020027/https://mywiki.wooledge.org/BashPitfalls#Filenames_with_leading_dashes

Overall, wildcards are just a classic "here is a programming language
footgun, we cannot fix it because the language is backwards compatible
to the 90s and earlier" which amounts to:

people love bash because...




an

Re: shell wildcard expansion (un)safety

Posted by lists on Nov 10

That says nothing about the amusing character # either at the
start of a name or after whitespace.





an

Re: shell wildcard expansion (un)safety

Posted by Fay Stegerman on Nov 10

* Eli Schwartz <eschwartz () gentoo org> [2024-11-10 00:59]:
[...]

[...]

Obviously, shell scripts and wildcards are one of the easiest ways to trip up
here. But the underlying issue is that CLI interfaces mix options and
arguments: the lack of a clean separation between data and code/commands
(another example is e.g. printing unescaped control characters to stdout,
something discussed on this list before, and far too common IME, as I...




an

Xen Security Advisory 463 v2 (CVE-2024-45818) - Deadlock in x86 HVM standard VGA handling

Posted by Xen . org security team on Nov 12

Xen Security Advisory CVE-2024-45818 / XSA-463
version 2

Deadlock in x86 HVM standard VGA handling

UPDATES IN VERSION 2
====================

Public release.

ISSUE DESCRIPTION
=================

The hypervisor contains code to accelerate VGA memory accesses for HVM
guests, when the (virtual) VGA is in "standard" mode. Locking involved
there has an unusual discipline, leaving...




an

CVE-2024-50386: Apache CloudStack: Directly downloaded templates can be used to abuse KVM-based infrastructure

Posted by Daniel Augusto Veronezi Salvador on Nov 12

Severity: important

Affected versions:

- Apache CloudStack 4.0.0 through 4.18.2.4
- Apache CloudStack 4.19.0.0 through 4.19.1.2

Description:

Account users in Apache CloudStack by default are allowed to register templates to be downloaded directly to the
primary storage for deploying instances. Due to missing validation checks for KVM-compatible templates in CloudStack
4.0.0 through 4.18.2.4 and 4.19.0.0 through 4.19.1.2, an attacker that...




an

Re: shell wildcard expansion (un)safety

Posted by Ali Polatel on Nov 12

Thank you. Around six months ago I added a restriction on filenames with
control characters to Sydbox[1] after I had read about a vulnerability
here on this list. I think it was about tar but my memory may not serve
me right. Sydbox is secure by default, so at first this feature was
enabled without any way to turn it off. After a few months of testing
with fellow Exherbo Linux developers, we have noticed some package tests
(nvim was one of them)...




an

Demand for Frequency Drives on the Uptick

AC drives are an essential part of the HVAC marketplace, and the growth of the market looks to be exceptional over the next few years. According to MarketsandMarkets, the market is expected to grow from an estimated $15.72 billion in 2016 to $22.07 billion by 2021.




an

High-performance Buildings Zero in on Zero-Net Energy

State and local regulations are driving new building construction as well as existing buildings to implement energy-efficient technologies in order to meet future carbon emissions reduction goals. These facilities, known as high-performance buildings, strive to deliver optimal efficiency, reliability, value, and comfort to tenants.




an

Panasonic Manages Consumer Comfort, Controllability, and Costs

Panasonic Corp. of North America is honing in on its focus to make it easier for both residential and commercial building owners to control the temperature and comfort level within the space. The company hit its targets with the introduction of two new products — the ECONAVI air conditioner and the Variable Refrigerant Flow (VRF) Smart Connectivity Controller.




an

Economizers Offer Many Benefits for Rooftop Units, Air Handlers

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.




an

Commercial HVAC Customers Demand Smart RTUs, Manufacturers Deliver

It is 2018, and this is not your father’s rooftop equipment. The old, reliable system taking up space on the roof has become so much more.




an

See What’s Possible at the New UTC Innovation and Technology Center

United Technologies Corp. (UTC), the parent company of Carrier Corp., recently opened the new UTC Center for Intelligent Buildings in Palm Beach Gardens, Florida.




an

Advanced Refrigeration Technologies Boosting Energy Efficiency in Supermarkets

In supermarkets, where HVAC and refrigeration equipment use 50 to 60 percent of all electricity consumed, new technologies and advanced control strategies have been developed to help boost energy efficiency as well as reduce emissions.




an

Cutting-Edge Construction: Putting Energy Management Into Practice

Here are two examples of the difference that high-performance building features and high-efficiency HVAC technology can make.




an

Industry Responds as Companies Commit to Battling Climate Change

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




an

Manufacturers Meet Demand for More Intelligent Building Controls

Smart products enable service providers to take a more proactive approach to addressing HVAC system and equipment issues, said Susie Gornick.




an

Johnson Controls acquires EasyIO Building and Energy Management System

Johnson Controls announced that it closed an agreement to purchase the EasyIO Building and Energy Management System (BEMS) product line.




an

Aircuity is Approved Vendor for Real-Time Energy Management Program

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




an

Acuity Brands to Acquire KE2 Therm

The acquisition extends Distech Controls’ addressable market into commercial refrigeration.




an

BrainBox AI in Agreement to Acquire ABB’s Multisite Retail Energy Management System Integrator Business

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





an

Industry Negotiates RTU Efficiency Standards

While many in the industry are pleased the DOE has taken the opportunity to work together to develop its final rule, exactly how much of the working group’s recommendation the regulatory agency will adopt remains to be seen.




an

DOE, Industry Finalize Standards for Commercial HVAC Products

After six meetings, the working group reached consensus and provided recommendations for energy conservation standards, test procedures, and metrics.




an

Roof Mount System Secures Solar Racks, HVAC Equipment, and More

OMG Roofing Products has introduced the PowerGrip Plus roof mount system, a watertight structural attachment system used to secure solar racks, HVAC, and other equipment to roofs covered with thermoplastic (TPO and PVC) membranes.