The phone rang at seven minutes after two, and the man on the other end could not get a whole sentence out, so the first thing I asked him to do was walk to the thermostat and read me the number.

This was the first hard freeze of last November, the kind that rides in on a north wind and takes Kingfisher from fifty degrees at supper to twenty by bedtime. Brick ranch east of town, built in the seventies, a heat pump I had put in a few years back with electric strips for backup. The homeowner was a widower in his seventies, lived alone, careful, the kind of man who keeps every receipt in a binder with tabs.

Nothing had failed. I did not know that yet, and neither did he.

What he had heard was this. A low hum that had been there all evening. Then a sharp click. Then a sound he described as a jet going over low. He got up, looked out the back window, and under the floodlight there was a cloud pouring off the outdoor unit. He took it for smoke.

His heart took off. His hands went cold. He got short of breath, and that was the part that scared him most, because his wife had died of a heart attack in that house two winters before, and now here he was, not able to breathe, with the furnace about to blow.

He said those words. The furnace is about to blow. It is a heat pump, and there is nothing in it that blows up, but that is not a fact a man can use at two in the morning with his pulse at one-thirty.

I told him what the after-hours call would cost, and he said come anyway. I told him to go sit in the front room, away from that window, and I would be there in twenty minutes. By the time I pulled in, the cloud was gone and the unit was humming along like nothing had happened, because nothing had.

Core line: "Clark and his colleagues took people with panic disorder and people without it, sat them in a room, and had both groups breathe fast and deep on purpose for a couple of minutes."

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