What we have learned is that the house takes a while to get warm, but conversely it also takes a while to cool down. With no cool evenings, it stays warm, but on nights like one we are expecting tonight, where they are forecasting under 20 degrees, it's very nice. We open the windows at night and catch a breeze. First summer in years that I haven't had a sore throat and head-ache all summer long.
So rather than the hum of an air conditioner, we go to sleep listening to crickets, loons on the nearby lake and frogs. Big fat frogs!!