# David Willson's Blog Posts Tagged 'EnergyPro' (1)

### Willowside Rd., Day 10, part 2

OK, I'm back from getting the dimensions of Doe's house, enter all the information into EnergyPro, and do an initial calculation. It looks like the house as it is has a HERS of 147, which means that the model predicts that it will use about one and a half times as much energy as a 'reference home', which is this exact same home if it was built to today's energy code requirements and has by definition a HERS of 100. 147 is not too bad but way above what we want. Let's see if we can get it below… Continue

Added by David Willson on April 25, 2011 at 11:30pm — No Comments

2011

## Forum Discussions

### Welcome Home Performance Forum Members! (formerly RESNET BPI - Energy Audit and Home Performance)

Started by David Butler in General Forum 3 hours ago.

### Speed Tips For Duct Airtightness Testing?

Started by Brendan Reid in General Forum. Last reply by David Butler 8 hours ago.

### What made this chimney fall down?

Started by Eric Kjelshus in General Forum. Last reply by Eric Kjelshus on Tuesday.

### How would you insulate this roof?

Started by David Butler in General Forum. Last reply by Dave Taylor Nov 11.

### Manual J (SD) for custom, luxury homes

Started by Dav Camras in HVAC. Last reply by Dav Camras Nov 10.

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## Latest Activity

David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Static pressure drop through a straight length of pipe is a function of friction rate, and friction…"
1 hour ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Apparently the air passing over the PVC creates a strong static field that in turn impedes air flow."
2 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Why would you think PVC has high resistance?"
2 hours ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Thanks David - I was going to look at PVC for the HRV but was cautioned against it, not because of…"
2 hours ago
David Butler replied to Don Fugler's discussion joining ducts in the group HVAC
"Great post, Sean. I agree that screws are wise when joining metal ducts, but its also true that…"
3 hours ago
David Butler posted a discussion

### Welcome Home Performance Forum Members (formerly RESNET BPI - Energy Audit and Home Performance)

Last month the Home Performance Forum merged with Home Energy Pros, now under the Home Performance…See More
3 hours ago
Sean Wiens replied to Don Fugler's discussion joining ducts in the group HVAC
"Various studies have indicated very little air flow along surface of duct (for ventilation - have…"
4 hours ago
Dara Bowser replied to Don Fugler's discussion joining ducts in the group HVAC
"Hi Don. We have never considered screws as impeding airflow, but I can see how in some ducts (e.g.…"
5 hours ago