Um, because we want to cool ALL of them? 
It's a pleasant 76 degrees with a humidity around 30%. Inside. Outside, it got up to 92, 94, or 96, depending on which nearby weather reporting station I checked on Weatherbug and Weather Underground. Our indoor/outdoor monitors recorded 102 each. The front one is on the porch that faces east; totally traps heat in the morning. The back thermometer is in a sunny place until the trees fully leaf out, so it won't be accurate for another week or two. The coolest, 92, is still hot!
CD, we get hot "up here". Not Dallas or Orlando hot, but enough days in the 80s and into the 90s to know better. The problem is, it is common to build a house with hot water baseboard heat - therefore, no duct work. It's cheaper to heat that way, but it has its issues. Having moved from a home that had central air, we inquired into costs to switch from baseboard heat to a ducted system. In spite of the increase in commission to each agent (our buyer's agent plus the selling agent for the builder), both tried to talk us out of it. "Oh, you won't need it for even two weeks up here over the entire summer." "Why spend the money when window units can be put in the rooms you want to cool?"
It was amazing how many neighbors became our friends that first summer...when the temps spiked into the upper 80s...for days and days on end.
Meanwhile, I laid on my back in the sun room, lights off, and stared out the ceiling at nature's fireworks. Ahhhh...... Dropped the temp down, too. All the way to - 72? Not going much lower, either. A/C on for the night, be we get to turn it off after the heat of tomorrow. Once the temps start to drop, tomorrow's low should be 49. Gotta love spring!
"The Cape" and the first few miles along the shoreline have the land breeze/sea breeze thing going, so they can be more comfortable when the ocean temp is in the land's favor. Out here in the wilderness (we're about 60 miles from water to the south and east, land-locked to the north and west), once it's warm, it's warm. We have a natural breeze in our yard since we didn't take out the woods from the back half of our lot, which is the west side. Once the sun gets beyond peak and drops low enough in the west, our entire house is bathed in shadow. That starts by 2:00 PM each day. If you cut the grass anytime after 5:00 PM, you can feel a real nice breeze as you head uphill towards the woods. Still, it doesn't mean a thing if it's going to be around 70 overnight.
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We just finished up with two lines of thunderstorms move through. Lightening! Rolling thunder! A cloudburst! I wonder how many neighbors fell out of bed.
Sounds like our weather. Hmm, maybe we're neighbors? Nah, we don't have a freezer in our garage.
Not really. Boston might have been that low when you checked, but we're 60+ miles away and surrounded by land. Our overnight low was 68 or 69 - I forget which one and have already reset the thermometer. Right now, 25 hours after our thunderstorm and 10-12 hours after the high of 88, we've dropped down to 54. We might lose another degree or two, but at least no 80s or 90s for the next week+. Ahhhhh...
