Christopher Cadwell's Blog Posts Tagged 'Efficient' (3)

HVAC and DC Fan Motors

Here are links to my latest posts on how these motors can be used for retrofitting in existing HVAC systems.

HVAC Savings Upgrades – Cutting Fan Watts In Half or More 

In this post I cover how the savings can be dramatic, and the most important part is to get duct pressures low.…

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Added by Christopher Cadwell on April 19, 2012 at 9:14am — 2 Comments

Notable Results in AC Training

The final survey results of the second week of students in the High Performance HVAC classes.
Here are some notable results of what the students felt that they got out of the course.
  • How to reduce # of registers while improving comfort. 
  • Importance of velocity - amount needed to properly mix air.
  • How to select register types to control noise and performance. 
  • Whole house as…
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Added by Christopher Cadwell on November 28, 2011 at 12:00am — No Comments

Super Efficient HVAC is Easy

Attending a week long class where veteran trainer Rick Chitwood is moderator has been entertaining and joyful. In the class which is inside a house that is being retrofit completely we are now designing and installing a super efficient HVAC system.…



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Added by Christopher Cadwell on November 18, 2011 at 12:30am — 9 Comments

Forum Discussions

How would you insulate this roof?

Started by David Butler in General Forum. Last reply by David Butler 7 hours ago. 34 Replies

Psychrometric Chart Training

Started by John Krochmalny in Training. Last reply by Mahendra Shah on Friday. 1 Reply

Dirty solar panels

Started by Evan Mills in General Forum. Last reply by Stacie Bagnasco Oct 16. 1 Reply

Latest Activity

David Butler replied to David Butler's discussion How would you insulate this roof?
"Sean Lintow proposed rails and clips (re: first comment in this discussion), but in the context of…"
7 hours ago
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"I missed where the suggestion for rails came in. The plywood would not need any rails. 4+ inches is…"
11 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"I'm a little confused about the necessity and purpose of using support rails if working on…"
11 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"If you insulate master bedroom and family room from below, you definitely need more R-value than…"
11 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Brad, I was only talking about using EPS between the ridges, if necessary, to conform to bolts.…"
12 hours ago
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"It kind of depends on the PIC. Not all insulation is made the same. Here in VT (and all of New…"
12 hours ago
David Butler replied to David Butler's discussion How would you insulate this roof?
"Filling those shallow valleys with rigid foam not only prevents primary foam panels from…"
12 hours ago
Brad Cook replied to David Butler's discussion How would you insulate this roof?
"Bill, you just posted a number of responses in different areas of the thread. I will try to respond…"
16 hours ago

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