your local a/c contractor is a good canidate to install the Ultra-Aire in your home. UA is simple for knowledgable contractor. Most UA dealers have been introduced to the unit via inovative customers.
Despite what you read, full featured a/c/hp will not control humidity during low/no cooling loads and high humidity. If you are getting adequate fresh air into your home, you need 20-60 lbs. per day of dehumidification to maintain <50%RH in your home. On a hot day, your a/c will remove this moisture. Fresh air is getting into your home naturally on windy days. Infiltration is one of the reasons your humidity maybe high now. A home should be tight enough to avoid excess infiltration during cold weather and be short on fresh air during summer. Very tight homes need the ventilating feature. If your home is a leaker, no need for fresh air from your UA. Just use it as a whole house dehumidifier. Homes that need humdification during cold weather are leakers. The should be tighten to the point where no humidification is required. That will save big bucks on heating. But you will need supplemental ventilation during milder temperatures. Not all bad. An air tight home is net energy gain with winter gains. Search "teddy bear" post for additional info. Regards TB
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"