Hi everyone,

I'm looking for a whole house ventilation solution that I can recommend to clients. I have no experience installing these, so I rely on your experience to give some good choices.

Thanks,

Andrew

Views: 2189

Reply to This

Replies to This Discussion

Some people seem to like the Panasonic spot ERV.

Other than that, there's nothing particularly cheap/easy. You need an appropriate space for the unit and the ductwork. It can be fairly difficult in a retrofit, maybe easier in new construction.

Thanks David. That was a very helpful response.

I think the hardest part (if you want a grade-A installation) is having a mechanical space inside the envelope for the HRV/ERV and some of the ductwork. In my own house (1930s with 9-foot ceilings and large attic) I've been puzzling over that one. I can either drop the ceiling somewhere and put the unit in there, or build an insulated enclosure around it in the attic, which is already knee-deep with insulation... 20/20 hindsight.

I have not seen any numbers on it, but my guess is that you lose a lot of efficiency with the unit and ductwork in the attic, like so many I've seen. They have the typical insulated flex running all over the place like an octopus, and I bet a lot of the heat recovery is lost. 

My company is building a small art studio building later this year, and I expect to use the Panasonic unit. In a building that's mostly one room (and extremely tight) I think it will be a good idea. We are creating an indoor space for it.

Thanks for the input David. I read the specs and it says do not install in an area that might be subject to temperatures over 104 degrees. That pretty much rules out an attic. I am thinking about how to retrofit this into an existing 1970's split level.

Fantec has worked for me or as David said some like Panasonic, etc... Stick with a name brand & watch the watt per CFM # 

I prefer going with standalone units run off timers - I make sure the unit can basically give me all that is required & then chop the amount needed in 1/4 to 1/3 - if they need more than that you can bump up the time it runs or the whens

As for the how & where's, well that varies depending on the situation - split level as in finished basement below, bedrooms above a great room for the main part? How much room do you have in between the floors - you can always dump the return low & pull air from the upper hallway (then all you need is a small chase in a closet or...

Unlike some that advise pulling from kitchens & baths - I would generally stay away from that as that is one reason why peoples HRV's freeze up & ERV's will just reintroduce the stuff in the air (use dedicated exhaust vents in those areas - no worries as it should pull in make up air through the ERV/HRV intake even with it off)

I would also recommend that you stay away from ones connected directly to a forced air system as you never know how they will use it. This also will not allow for fresh air to be pulled in as makeup air as those require mechanical dampers.

Be careful as some states require all the ventilation aspects be handled by a licensed HVAC company

 

Thanks Sean, great information and a lot to think about.

Depends on the home and what problems you are trying to solve.

Existing homes you can identify specific problems that have occurred over time and work on remediation.

New construction, you need to work toward the standard and apply your experience.

Attic runs (all those outside conditioned space.  Don't worry about the exhaust air. After it is processed by the unit, it doesn't matter. Intake may merit some consideration.  Always watch the placement of fresh air intakes.

The panasonic is designed to be a drop in (think head of a mini-split). The fan tech unit is designed to be hidden away.  I mounted my Fan Tech in the garage. The supply runs through 20 feet of attic.

In all the REM files I have worked with this, the cost is the current pulled by the fan minus any heat/energy gained.  Worst case you lose your gain and end up with the cost of juice to run the fan.  I've seen those numbers run from 75 - 150 per year. Best case is 50% of that back for gains. Still a cost.

This is not an efficiency issue.  It is a comfort and safety issue.  When you create comfort people stop doing energy inefficient things to obtain comfort.  Think turning on the AC in a Heating climate in February.

Buy the iPad app from Rick Karg, get the free spreadsheet from Paul Raymer. Both sit on the committee that wrote 62.2.  The calculations are not that hard and when you comp out the spot ventilation and infiltratrion numbers, you will be nicely surprised at the smaller amounts needed.  I just finished the calculations on an 8500 sf home. The plan is SPF for insulation. The last BD I did for the contractor came in at 1 ACH at 50.  Using that, this home needs 74 CFM 24/7 of balanced ventilation.

RSS

Featured Forum Discussions

What causes a temperature plane in a home

Started by Energy Wise Solutions in HVAC. Last reply by Peter Krych on Friday. 4 Replies

Velocity Pressure Testing

Started by Horace Douglas Hunt, Jr. in General Forum. Last reply by Horace Douglas Hunt, Jr. Apr 15. 2 Replies

Videos

  • Add Videos
  • View All

Latest Activity

Efficiency First California posted a blog post

Building a Clean Energy Future, Respect for the People Who Will Build It

You don’t need to spend a great of time deal in the policy world before you hear a conversation…See More
2 hours ago
Profile IconDavid G. Tamutus and Sharon Block joined Home Energy Pros
2 hours ago
Gary Reed added a discussion to the group Job Board
Thumbnail

HOME ENERGY ADVISORS WANTED (NEW YORK STATE: Saratoga & Glens Falls Region)

We are currently seeking experienced HOME ENERGY ADVISEOS to join the Jack Hall Plumbing &…See More
yesterday
Profile IconGary Reed and Kurt Shafer joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
Ron Sarrick liked Energy Wise Solutions's discussion What causes a temperature plane in a home
yesterday
Kurt Shafer added a discussion to the group Job Board
Thumbnail

Installers for Whole House Fans in Various Cities

Invisco Whole House Fan Company in Temecula CA sells the highest performance fans in history. The…See More
yesterday
Kurt Shafer posted a blog post

First Rooftop Whole House Fan for Homes without Attics

Eichler was one of the most famous Mid Century Modern home builders in the 50s and 60s. His homes…See More
yesterday
Travis Lundberg replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Do you still happen to have a blower door fan, frame and fabric still for sale?  If so please…"
yesterday

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service