I have had the best experience with a total encapsulation type constructed house. We built our last home that we plan to spend the rest of our lives in using this method of construction. It has been the best and most energy efficient home that I have ever lived in. It is a 2 story 2800 square foot home using a 3 ton HVAC with a variable speed air handler and a 4 zone damper controlled system. We have 3 zones on the lower part of the house and 1 zone up stairs. A totally encapsulated house is built like an ice chest with windows and doors, so it takes very little to heat and cool.