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Extra Edition

Btu Buddy 139: An Overcharged System - Part 2

Bob and Tim were at the shop after a day of service calls. The weather was still hot, 93°F, and Bob said, “We just did a service call with a system that was overcharged and had an orifice expansion device. I would like to go into further details with you on a system with a thermostatic expansion valve (TXV) for an expansion device.”


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Chimney Fundamentals: The Science of Venting Flue Gases - Part 1

How to Keep Your Customers Safe as Well as Comfortable

This multiple-part article series will discuss the basics, codes and standards, and the science behind chimneys. It will show how back drafting affects chimney performance, while explaining the principles of positive pressure. It will explain how to create and use positive pressure so chimneys will draft for safety and performance.


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Big Changes Ahead for Joint Employer and Independent Contractors

Employers Need to Understand the Current Landscape and Update Their Policies and Procedures

NLRB actions and court decisions have taken the issue of joint employers, independent contractors, and leased employees far beyond a single industry. These changes could profoundly impact the liability and responsibility companies have regarding contractors and contingent employees.


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Researchers Develop 'Easy-to-Create' Compound for Magnetic Refrigeration

Material Is Simpler to Produce, and Therefore Cheaper, Than Simply Using the Rare Earth Mineral Gadolinium

Researchers at the A*STAR Institute of Materials Research and Engineering and the National University of Singapore believe they have created a powerful magnetic refrigerant that is easy to make in the lab, reports the nanotechnology journal nanowerk.


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Building Automation Alliance Firms Complete Facility Upgrades for Florida Hospitals

BAS, Energy Efficiency Expertise Results in Comfort, Savings for Health Care Providers

InsideIQ Building Automation Alliance member firms MC2 and CM3 have completed building automation system (BAS) and energy efficiency projects for two Florida Hospitals. Both firms are experienced providers of automation and energy management systems for a variety of commercial buildings, including health care facilities.


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Expand Your HVAC Business with Home Energy Audits

Homeowners Are Looking for Ways to Save Energy and Money; Here’s How HVAC Professionals Can Help

Homeowners want ways to save energy and cut costs. HVAC contractors are looking for new business opportunities. And technologies like thermal imaging enable you to see and do more than ever before. Why not bring customer needs, technology, and your skills together by offering home energy audit services? Here’s how.


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On the Way to Safe and Secure Smart Homes and Buildings

Researchers Are Looking to Prevent Hacker Attacks

A growing number of household and building operations can be managed via the Internet. Today’s smart homes and smart buildings promise convenient, efficient building management. But often these systems are not secure. Scientists are working on a software product that defends against hacker attacks before they reach the building.


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Building Your HVAC Business: Put Your Website to Work

Four Steps to a Hardworking Website

As an HVAC contractor, your focus is likely on everything but your website. This is completely understandable, especially when the phones are ringing. Here are some easy tips to get your website working for you, building your business every day of the year.


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Maintenance Is the Key to Control Legionella

A Major Risk Factor Is a Departure from Planned Maintenance and Cleaning Schedules

Two years after contaminated cooling towers led to a Legionnaires’ disease outbreak in Edinburgh hospitals, the message about proper maintenance is more important than ever.


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Demos with US Navy Validate Energy Efficiency Savings Opportunities

NREL Identified Advanced Plug Load Controls and Whole-Building Energy Efficiency Retrofits as Good Investments

Field demonstrations of newly proven energy efficiency technologies are yielding valuable results for the U.S. Navy, helping it meet energy goals. The initial results have encouraged the Navy to move forward with broader implementation of several of the energy efficiency technologies.


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2014 SMACNA Annual Convention

Views from the 2014 SMACNA Annual Convention in San Antonio.

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NEWSMakers: Chris Mathis

Chris Mathis, president of Mathis Consulting Co. and vice chair of ASHRAE’s residential ad hoc committee, talks about ASHRAE’s exploration into the residential market. Posted on Oct. 17.

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2014 October 27

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EFFICIENCY STANDARDS

DOE has denied AHRI’s petition for reconsideration of walk-in standards. Is it getting harder to reach consensus on efficiency standards?
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2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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