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3 Answers

Furnace and HRV

We are in the market for a new furnace and hrv, do they come as a single unit? Can you also recommend a list of reliable and efficient brands?

Thank you!

In General questions | Asked By Diane MacIntyre | Mar 22 15
2 Answers

U-values of solid walls

I asked a GSHP installer how they could work out heat loss for each room without knowing the construction characteristics of the walls, roof and floors and received the following answer "our technical design team have worked out based on building regulations the required U-value’s for different properties be it a new build, renovation or boiler replacement in an existing house"

Is this a case where common sense has failed me, can they do this with any degree of accuracy or am I right to be suspicious of the results their averages produce?

In PassivHaus | Asked By George Winkle | Mar 19 15
4 Answers

What R-value is required on the stem wall of a crawl space?

I am located in Zone 3b, Orange County CA.

In Building Code Questions | Asked By keith messick | Mar 21 15
8 Answers

Water-source heat pump sizing

My 2-ton Carrier water source heat pump needs replacing. It's a condo, so I own the heat pump & handler, but not the water loop. I think I'm going to replace with another Carrier, but I'm considering downsizing to a 1.5-ton unit.

In Mechanicals | Asked By David Hicks | Mar 19 15
2 Answers

Insulate a solid wood cathedral ceiling / roof?

I have a cabin in central Oregon with a cathedral ceiling/roof. it is 2x3 laminated to form a solid roof and, with asphalt singles and no insulation. In the next year or so I plan to roof it and would like to add insulation. How can I do it to minimize the weight and gain insulation.

In General questions | Asked By scott lieurance | Mar 21 15
2 Answers

Is it possible to contact a previous poster?

one of the topics on your excellent site is precisely what i have going on. I'd like to find out what this particular individual eventually ended up doing and see how it turned out. is this possible? He posted as Kach Kidibba. Topic was attic moisture. Thanks!

In General questions | Asked By Dave Robinson | Mar 21 15
7 Answers

New home and ductless minisplits

In the process of getting the Manual J done as per code requirement. The home is as follows:
Zone 4B - R-10 / R-30 / R-60 with R-8 windows - ICF walls - Slab on grade - 2 stories - 3,200 sq. ft. - Open floor design.

Looking to go with Mitsubishi ductless heat pump minisplits wall units (22 - 26 SEER). Two on the 1st floor and two on the 2nd floor.

How good are the ductless cassette units?

One room might get the cassette unit instead of the wall unit because of the room layout.

In GBA Pro help | Asked By Peter L | Mar 18 15
7 Answers

Converting old outbuilding to heated workshop

I have a wooden garage, built in 1929 in coastal Maine, in remarkably good shape. It's got a post and pier foundation and had the front ripped off to convert to a 2 car garage in the 90's. I plan to reconvert it to it's original intent as a workspace. Like most of these old outbuildings in our neighborhood, the lawn has grown up to the base of the siding (or maybe they were intended that way) and there is a major negative grade inside, kind of like an earthen crawlspace foundation. When I started digging around and found this out, I got very worried about rot.

In Energy efficiency and durability | Asked By A. Bradford | Mar 20 15
3 Answers

Has anyone ever used stacked IGUs in a homemade window?

I'm building a shop for my small construction company and have some insulated glass units that I saved from previous jobs. Has anyone ever used stacked IGUs in a homemade window?

I was thinking of making one removable like a storm window.

In Energy efficiency and durability | Asked By chad zeman | Mar 19 15
7 Answers

Rigid foam overcoat method on my own house

Hello,
Been reading this website on and off for the last 7 years or so. I really appreciate the knowledge base here.

It is time to re-roof my own house, Denver, climate zone 5b. I plan on incorporating something similar to the JLC August 2014 article, "Project Overcoat" with a couple of caveats.

In Plans Review | Asked By Matthew St Martin | Mar 20 15
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