Replies

1. 
   user-2310254 | Nov 02, 2017 09:43am | #1

   Louis,

   ASHRAE’s residential ventilation standard (Standard 62.2) sets the minimum ventilation rate at 7.5 cfm per occupant plus 3 cfm for every 100 square feet of occupiable floor area. So a single Panasonic with a maximum ventilation rate of 100 cfm is not sufficient for your home. It's possible you could use multiple units, but that might not be the most cost-effective approach. Is the 5,300 all conditioned space? How many occupants?

   Read more: https://www.greenbuildingadvisor.com/blogs/dept/musings/designing-good-ventilation-system#ixzz4xHVmZSFJ
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2. 
   user-305836 | Nov 02, 2017 11:55am | #2

   My mistake with the square footage...I was going by some plans, which were incorrect. Actual total conditioned space is about 4523 sq ft.

3. 
   ethan_TFGStudio | Nov 02, 2017 12:51pm | #3

   Wow that's a big home. Sounds like a chalet.

4. 
   user-2310254 | Nov 02, 2017 06:02pm | #4

   In theory it seems like you could handle the ventilation requirement with a couple of Intelli Balance units. Are you working with an HVAC engineer to design the systems for your home? I think it would be wise to include this type of expert in your build process.

5. 
   user-305836 | Nov 03, 2017 09:31am | #5

   I have consulted with a HVAC guy and have consulted Ultimate Air for their setup recommendations. They have been very helpful.

   I'm thinking that it really makes sense to end up with the Ultimate Air...The things that I value in a ventilation system would be air exchange and introduction of fresh air into the house, filtration to reduce dust and pollens in the house, efficiency...so that our interior temp isn't uncomfortably low in the winter (when it's around 0 degrees F outside and humidity is 10-15 %RH). Radiant floor heating is wonderful...but slow to respond to rapid ambient temperature changes. Seems to me the Ultimate Air is the most logical way to go to address all these issues.

6. 
   user-2310254 | Nov 03, 2017 09:38am | #6

   HVAC contractors tend to use the WAG approach, which results in wildly oversized systems. It is much better to hire a third-party engineer to properly size your system for efficiency and comfort. See this article for details: https://www.greenbuildingadvisor.com/articles/dept/musings/who-can-perform-my-load-calculations