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. Your windows and doors must be very energy efficient or your just waisting energy. We lost our heating system for 5 days during this past record breaking snow storm in Texas. I brought in 2 oil filled electric heaters and we kept the house at 65 degrees until repairs were made. If you would like to know more about this type of construction please give me a call. 682-429-2116