For the residential HVAC industry, home performance contracting is exciting, is luring more people into the mechanical systems trade, and is helping to evolve HVAC contractors to new levels of professionalism....More
A growing number of highly successful HVAC contractors are adding duct renovation and commissioning to most of their equipment replacement jobs. This added service is paying big dividends to their customers, and at the same time is leading their companies to double digit net profits....More
There are several high-capacity variable speed/variable torque replacement blower assemblies on the market today that may provide an invaluable solution when you need to increase system airflow....More
This is the third in a series of HotMail articles by ‘Doc’ Falke focusing on specific techniques designed to test, diagnose and improve the performance and efficiency of residential HVAC systems....More
For decades government and utility programs have provided HVAC contractors cash incentives to install high-efficient equipment and seal ducts. A major shift is underway uncovering a wealth of never before realized energy savings....More
When airflow increases 10%, motor amp draw will increase 33%. It’s because of this little known fact that thousands of blower motors are cooked each year as technicians adjust fan speed to increase fan airflow....More
Most filter manufacturers only provide pressure drop ratings for each filter at one rated airflow. So what do you do when you want to install that filter in a system that requires a higher airflow than what’s listed by the manufacturer?...More
Adjustable pulleys are the most commonly used method of changing fan speed in light commercial balancing. Let’s take a look at how adjustable pulleys work on a fan and blower motor and learn how to adjust them. We’ll also learn how to use Fan Law One to calculate how to change the dimensions of a pulley. This will result in a predetermined change in the fan speed....More
If each of us searches our memories we can remember a system or two that we designed which never quite performed like we intended it to. Let’s take a look at four of the top reasons HVAC system designs fail and consider a few tricks that will assure we ......More
Redesigning an existing HVAC system is completely different than designing a new HVAC system from scratch. The primary difference is that you redesign an existing system to remove the defects that prevent it from operating at maximum capacity....More
First of all, a big thank you to those of you who took the time to sign the online petition urging the California Energy Commission to continue allowing the use of traditional balancing hoods in the Title 24 energy regulations....More
Just as other energy standards have chosen to embrace air balancing as a specified method to measure the performance of HVAC systems, the State of California has proposed a ban on air balancing hoods as we know them....More
Check out this month's selection of products which includes a whole house IAQ system, wind-driven hurricane louvers, and much more!
Our product showcase award winner this month is VLE Enterprises with their point based incentive program.
Remote monitoring for refrigeration systems is the next best thing to being in the store or warehouse. Here's a quick look at four vendors —three of which may be new for some readers — with monitoring solutions.
New technology allows a current switch to be configured outside of an electrical enclosure and installed on a cold wire, thereby eliminating the need for a PPE suite and preventing arc flash hazard. PPE suits, worn by technicians working in a live enclosure, are often cumbersome and can hinder the installer’s ability to configure an adjustable current switch....More