All you need for HVAC is a small gas furnace, a mid SEER a/c, and a whole house ventilating dehumidifier. In 10 years, when repairs are needed, they will be simple. This concept will allow you to maintain <55% relative humidity (RH) when the A/C is off and when the home is unoccupied with minimal electric usage.
Provide 60-100 cfm (depending on the size of the house) of fresh air when occupied and to keep windows dry during cold weather.
This controls dust mites and mold along with keeping it very comfortable. Include an Ultra-Aire whole house dehumidifier for when the sensible cooling load is low and the outdoor dew points are +60^F. Dehumidifier will maintain 55% RH even with the a/c off. This reduces energy use significantly and makes the home healthy and comfortable.
Last Updated on Jan 14 2020
By Ken Gehring