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Troubleshooting Puzzle: A Split System With Ongoing Complaints

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.




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Troubleshooting Electronic Expansion Valves

The EEV is often used in modern refrigeration systems, but troubleshooting its common failures may be complicated.




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When Troubleshooting a Refrigeration System, Don’t Make Assumptions

Troubleshooting refrigeration systems can be complex and frustrating, so put aside any assumptions and inspect the system thoroughly before making any diagnosis.




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Troubleshooting PSC Fan Motors

Troubleshooting PSC fan motors is a common task for service technicians, and failures tend to be either electrical or mechanical.




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Why More HVAC Contractors Should Offer Duct Cleaning Services

Over time, dirt, dust, pet dander, debris, and more accumulate in air ducts. And since the HVAC system works basically as a whole-home vacuum, all of that is recirculated through homes when the HVAC system runs, unless the ducts are cleaned out.




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Should You Clean the Ducts of a Home with Asbestos?

Trained to identify the varying types of asbestos used in old buildings, Matt Mountain of Mountain Duct Cleaning knows what he’s looking for.




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Should HVAC Contractors Be Selling Geothermal?

HVAC contractors should be prepared to sell geothermal to new customers regardless of any incentives.




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Washington State Pushes for Heat Pumps

Heat pumps for both space and water heating will be required in most new homes in the state of Washington beginning next July.




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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.




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Troubleshooting Puzzle: A Split System That’s Not Cooling

In this month’s troubleshooting problem, the equipment is a split system that’s approximately 8 years old.




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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...




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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.





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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...




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Re: CVE-2024-36905: Linux kernel: Divide-by-zero on shutdown of TCP_SYN_RECV sockets

Posted by Solar Designer on Nov 12

NIST doesn't appear to provide their own CVSS vectors/scores lately.
However, they republish (with attribution) some third-party ones, this
time from CISA-ADP. The CISA-ADP CVSS vector for this vulnerability
specifies that it not only is network-reachable, but also that it has
High impact not only on Availability, but also on Confidentiality and
Integrity. This results in a CVSSv3.1 score of 9.8. Even merely
correcting the vector not to...




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Re: CVE-2024-36905: Linux kernel: Divide-by-zero on shutdown of TCP_SYN_RECV sockets

Posted by Clemens Lang on Nov 12

Hi,

I think the source for the CISA-ADP data is at [1]. For this specific CVE, the relevant file would be [2]. Their readme
has a section at the bottom, where they encourage feedback:

I’m aware of at last one prior case where a similar case of (IMHO) overblown CVSS scores was discussed in an issue on
this particular GitHub project [3].

Somebody seems to already have opened a ticket for this CVE, too: [4]

[1]:...




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RE: CVE-2024-36905: Linux kernel: Divide-by-zero on shutdown of TCP_SYN_RECV sockets

Posted by Joel GUITTET on Nov 12

Hello
First thanks to Alexander for reposting because I was not able to do so!
You're right Clemens, I have myself ask the question on this github
(https://github.com/cisagov/vulnrichment/issues/130), but still no information for the moment.
Joel




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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)...




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Shaping the Buildings of Tomorrow

The buildings of tomorrow are chock full of Internet of Things (IoT) devices and equipment that connect tenants, mechanical systems, and facility managers to up-to-the-minute data and progress reports.




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QA Graphics: Energy Dashboard

This product is integrated to help users work toward earning LEED requirements and other sustainability and accreditation and education agendas.




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Hamid Sarshar Named President of TESCO Controls

Hamid Sarshar will lead the 50-year-old company into the next strategic phase of growth and innovation within the UFT platform.





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Residential Cooling Showcase 2016: Systems Designed to Keep Customers Cool

Every year, The NEWS introduces the latest cooling equipment available for the upcoming summer season in order to help contractors prepare for this busy period by doing the research that will help them to distinguish between brands. The coverage features specific information about each individual product as submitted by the manufacturers.




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Commercial Cooling Showcase 2016: Summer Heat No Match for HVAC Cooling Equipment

The manufacturers provided all of the data included in the product grid as well as the photo feature. Therefore, any questions should be directed to them via the contact information provided in the photo feature section.




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Residential Heating Showcase 2016: New Products Help Homeowners Feel the Heat

This heating showcase provides in-depth information on the features of each individual unit and also includes technical support information from the manufacturer. The manufacturers provided all of the data included in the product grid as well as in the photo feature; therefore, any questions should be directed to them via the contact information provided in the photo feature section.




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Commercial Heating Showcase 2016: New HVAC Systems Help Keep the Commercial Market Warm

Each year, The NEWS spotlights the industry’s latest commercial heating products. The manufacturers provided us with a brief description of features included with each product.




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HVAC Pros Discuss Their Favorite Diagnostic Troubleshooting Tools

HVACR technicians are special individuals. They have the intelligence, aptitude, and knack for problem-solving. In fact, they are expected to know how to diagnose and troubleshoot equipment of all types, sizes, and ages.




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possible false positive for 'INDICATOR-SHELLCODE x86 setgid 0' can someone confirm

Posted by John via Snort-sigs on Oct 29

When I attempt to download the following xz file, my IPS blocks it with the below populating the snort log. I suspect
this is a false positive unless there is some code in the xz file that is truly malicious. Can someone with more
knowledge about the rule please comment?

Link to file that triggers the match:
http://fl.us.mirror.archlinuxarm.org/armv7h/extra/qt5-base-5.15.15%2Bkde%2Br136-1-armv7h.pkg.tar.xz

Entry from snort log:...




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Venturing Into E-Commerce: What HVAC Contractors Should Think About

Selling products online is a whole new ball game. So, contractors will want to learn about their consumers buying journeys, and thoughtfully consider how to launch the online store, what products to sell, and how to market it.




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New Study Shows Homeowner ‘Repair Or Replace?’ Tipping Point

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




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The Importance Of Female Leadership In The HVACR Industry

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Commercial Heating Showcase 2024

Commercial heating equipment manufacturers are rolling out new systems that are energy efficient, as well as service friendly for contractors.




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Women in HVACR Shine Bright in the Lone Star State

The recent Women in HVACR conference offered sessions aimed at advancing attendees' knowledge on industry topics such as the refrigerant transition, as well as building their leadership skills.




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Few Homeowners are Aware of HVAC Incentives, Survey Shows

Low public awareness of incentives that can subsidize residential HVAC purchases means contractors have the opportunity to educate and position themselves as trusted advisors, marketing experts say.




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Name Has Changed, But ASHB’s Mission Remains

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.




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ASHB Names New Board Member

“Julie Petrone is an invaluable new partner in ASHB’s efforts to advance the smart technology industry,” said ASHB CEO Greg Walker.




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Partnership Helps Food Retailers Save Energy

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.




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Carrier’s Tommy Hulland Joins ASHB Board

Hulland is the associate director of strategic planning and market intelligence for residential and light commercial HVAC at Carrier.




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Residential Cooling Showcase 2024

In this showcase, The ACHR NEWS introduces the latest cooling equipment available for the upcoming summer season in order to help contractors distinguish between brands.




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California Heat Pump Partnership Aims to Scale Up Electrification of HVAC

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




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Cashing In on Heat Pumps: A Primer on Incentives, Rebates, and Tax Credits

With “heat pump” and “incentives” almost being synonymous at this point, contractors need to understand the basics to ensure customers are receiving the benefits.




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Residential Heating Showcase 2021

Every year, The ACHR NEWS introduces the latest heating equipment that is available for the upcoming winter season.




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Troubleshooting Puzzle: An Electric Furnace That’s Not Performing

The equipment in this month’s troubleshooting problem is an electric furnace that has been in service for at least ten years and has no service history.




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Facts + Figures: AHRI Shipment Data for July 2021

Industry figures are estimates that are derived from the best available figures supplied by a sample of AHRI member companies.




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Facts + Figures: AHRI Shipment Data for November 2021

Industry figures are estimates that are derived from the best available figures supplied by a sample of AHRI member companies.




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Residential Heating Showcase 2022

Every year, The ACHR NEWS introduces the latest heating equipment that is available for the upcoming winter season.




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Basic Furnace Maintenance and Troubleshooting

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




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Residential Heating Scene Shows Mix of Cold Climate Heat Pumps, Furnaces

Cold climate heat pumps were on full display on the AHR show floor and manufacturers were eager to share their progress reports in the Department of Energy’s CCHP Challenge.




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Peterman Brothers Charity Showdown Supports Indianapolis-Area Community Organizations

Throughout March, voters will help the staff at Peterman Brothers select four charity partner organizations for 2023.




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Residential Heating Showcase 2023

The residential heating showcase is designed to help HVAC contractors learn about the new heating equipment that is available for the upcoming cooler months.




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Why Every HVAC Contractor Should Consider Adding Combustion Testing Services

Due to a lack of training, time constraints, and numerous other reasons, many HVAC contracting companies are not performing combustion testing, potentially compromising customers’ safety.