If you have air handling equipment in the attic spray the rafters so it's not working in extreme tempatures.
Not following you here, with "air handling equipment" are you referring to the actual duct work or compressor units?
Houses that are sprayed from the ground up are extremely tight and usually require some forced ventilation, something their hvac contractor should take into account.
Way back when, with homes that were considered "air tight" we use to put bathroom fans on timers so the cycled multiple times a day for various intervals of time. We also installed vents much like dryer vents for air intake in selected locations in a home.
What is done today to achieve fresh air exchange?
