[teddy bear]

I am curious about your concerns about "indoor air quality". There are several on this site that share your concerns. Most of the building/mechanical trades avoid the issue because of additional cost and complications.

The reality for me is that a significant percentage of the population is sensitive to these issues to the level that their lives will be longer and they will be more comfortable if we meet certain standards that eliminate the threats that that effect sensitive occupants health and comfort. This includes the indoor pollutants from building materials and occupants activity. "Indoor Air" is outside air with pollutants from the structure/occupants minus the oxygen, plus the CO2 from occupants.

Here is my list of issues.

Build a home that has the components that provide the control of outside air and moisture passing through structure necessary making control of interior environment possible. The control includes moisture and soil gases from the earth. The building industry has established a standard of building air leakage called "air change rate" measured by a blower door.
Hope your builder provides a measure air tightness. Few understand that a +20 mph wind is similar to a 50 Pascal blower test. Most experts suggest a fresh air change in the in 3-5 hours when the home is occupied. Outside air is 20.5% oxygen. People doing physical activity or if impaired need 19% O2 to allow their bodies function. Most suggest that a home should be .1-.2 natural air change at your local on the average winter condition. Understand colder temperatures increases the stack effect and typical 7 mph winds. Consider 20 mph is 20X more air change and calm winds and mild temperatures is less than an air change in 12 hours.

Hope I described your home.

Back to your post.

Air filtering of the recirculated air in your home should be merv 11 minimum, merv 13 if possible.

Your a/c should be setup to maintain <50%RH to control biologicals growth like mold, dust mites, and bacteria at the desired temperature in the home while occupied and receiving a fresh air change of +75^F dew point outside air is 3-4 hours. Any damp spots for +24 hour have risk of biologicals growing. The condensate pans should be pitched to drain without puddles in the corners.

During evenings and rainy days supplemental dehumidification will be required. Yes, a whole house dehumidifier with the fresh air ventilation option is simplest way to maintain during the evening hours and rainy days while the a/c does not run enough to remove the 3-5 lbs. of moisture per hour from the fresh air and occupants needed to maintain <50%rh.

Tell us how you got interested in this concept and Aprilaire as a provider of the equipment.

I personally am involved in the development of the Santa Fe Ultra line of ventilating dehumidifier for the last 34 years.

We seen big improvements in the health of enviromently sensitive people improving the homes indoor space of sensitively people's homes. Santa Fe Ultra/Broan/Trane lines of dehumidifier include the Merv 13 air filters high efficiency dehumidifiers.

Keep us posted on your progress and issues.

Regards Teddy Bear