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5 Answers

Branch box location question

Branch Box for Mini-split system serving upstairs living quarters. The manufacturer says: don't install in a hot and humid location for long periods of time. They also say: Branch Box is indoor use only. I'm in CZ 3, central Oklahoma. Can I put this in an attic in my location? I would say no. Should I try to get it inside a mechanical room location down on the first floor(near 1st floor ceiling/2nd floor floor)? I would still have to run all the branch lines through the floor and up the walls to the attic and then to the air handler locations.

In Mechanicals | Asked By Inger Peters | Oct 27 17
1 Answer

Slab on Grade in Climate Zone 6

Hey all,

So watching a bunch of Matt Risinger, he's always talking about slab on grade builds, and how we have basements in the far north etc. I know these topics have been brought up before.

I'm in Climate zone 6, Toronto. I'm designing a 100sqft satellite building, or you could call it a shed with all the bells and whistles of plumbing, elec, heating etc.

I'd like to do a frost protected slab on grade for this to incorporate infloor radiant hydronic heating. The slab will essentially act as the radiator, and be the base for the Insulated perimeter wood stud walls.

In Energy efficiency and durability | Asked By Jamie B | Feb 17 18
2 Answers

Hot water recirculation loop with PEX homerun system?

Has anyone played with the idea of doing a hot water recirculation loop with a pex manifold homerun system?

My desire for a recirc loop is mostly inspired by Gary Klein and my reading/watching of his work. Although he doesn't recommend a home run system because you can't recirculate hot water.... well, I think it might be possible. Maybe I'll sound crazy here, but what can I say, I love systems design.

I see this as 2 issues:

1. Is it doable?

In Green building techniques | Asked By Jamie B | Feb 17 18
1 Answer

ERV vs fresh air intake

So my HVAC design is looking like I will do a fancoil on each floor.

I'm seriously considering going with an air-to-water chiller for the outdoor unit and a spacepak aircell on each floor, 4 in total.

These units have a 4" round fresh air port that you can program a percentage of fresh air.

In Energy efficiency and durability | Asked By Jamie B | Feb 17 18
29 Answers

Cold weather performance reports from minisplit owners

This morning I drove to town for a dentist appointment, and the digital outdoor thermometer on my Subaru bottomed out at -28°F as I drove through Lyndonville, Vermont.

During the past week, the thermometer at our house hasn't risen about 0°F, even during the afternoon hours. Of course, all of northern New England and the upper Midwest has been experiencing similar temperatures this past week.

So I'm taking this opportunity to ask owners of minisplits to report on how well their systems are working during the recent cold snap.

In General questions | Asked By Martin Holladay | Jan 2 18
8 Answers

One Multi- or Two Single Mitsubishi heat pump outdoor units

Hi,

In Mechanicals | Asked By david flinn | Feb 14 18
3 Answers

Any recommendations for financing an off-grid house in Canada?

I have my heart set on an off-grid house in Ontario, Canada. I thought it would be a relatively easy purchase but every mortgage broker that has looked into it has come back saying that the bank will not finance an off grid house. I don't know if it's worth it to try again but that means multiple credit checks which is not the best either.

Can anyone recommend anyone in Canada that could help? Time is of the essence! Any advice extremely appreciated!

In General questions | Asked By Laura Mandy | Feb 16 18
5 Answers

Radon system design with drain tile to daylight

We are in the process of remodeling our basement and will be pouring a new concrete slab. The house was built in the 1940’s and sits on very dense clay soil. The old concrete has just been removed and we’ve dug down 4” below the top of the footings so that 2” of stone can be placed followed by 2” of EPS, a poly vapor barrier and new concrete. A one year radon test was completed two weeks ago and the average value was 6.6 pCi/l (test completed with all old concrete in place); we will be installing a radon vent prior to pouring the new slab.

In General questions | Asked By Andy Freeman | Feb 16 18
5 Answers

Are 48" Baseboard Diffusers necessary?

Doing flooring and have pulled out the baseboard diffusers from 1959 house. They are 48" long but the hole in the floor is only 2" x 12". Can I replace with a smaller size or is the 48" length helping to spread the warm air around the room? Note that there are 2 of the 48" diffusers along the same wall in the 14' x 17.5' living room.

Thanks in advance!

In Energy efficiency and durability | Asked By MollyV | Feb 12 18
11 Answers

Laminate my 2 x 4‘s with another 2 inches or more insulation?

I have a table saw and can rip all day long, plus I have the time, so I was thinking of upping the exterior insulation thickness.
I am insulating the exterior wall in my laundry room plus the framed area above the finder block wall in the corner of my basement that is above ground.
Between the Roxul and the drywall I am putting into those exterior walls I am planning to use Membrain vapor barrier, with staples and acoustic sealant of course. The laundry room is on a slab in my large 50’s split-level home.

In General questions | Asked By JakeNY | Feb 16 18
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