No HVAC wall/roof assembly in hot/humid Climate Zone 1A
We’re building a home in zone 1A Honoulu, Hawaii. It’s a year round cooling climate with high humidity. The house is on a steep site, and currently planned to be built on piers with airflow underneath, 2×4 walls, and a vaulted ceiling. We do not plan to have any type of AC. The main source of cooling will be through trade winds and ceiling fans. Outdoor air quality is high. Humidity is a bit of a challenge, but with an open, cross-ventilated house it’s just something to live with.
From October through May, the house can be fully open and we’ll aim to match the outside temperature. From June through September, we’ll want to delay the heat gain until the evening when we can flush the house through ventilation/the use of lightweight materials that release heat as quickly as possible. I’m thinking that’ll look like closing the house in the morning and opening it back up towards the evening, provided that we can keep a most of the daily solar gain out of the house.
What would be the recommended wall/roof system for this? Is there a way to use radiant barriers effectively or should I just use a reflective roof? Is there a best type of insulation for this system? Trying to do this in a cost effective way, but open to all ideas. Any other thoughts are welcome.
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