LOUISVILLE, Ky. (WDRB) -- The spike in heat also means a spike in business for companies that repair home air conditioners. Searing temperatures have made demand for the service red hot.

When David Wolff started work Friday morning, he knew it was going to be at least a 12-hour day.

"It's a pretty full day. Non-stop," said Wolff as he stooped over an air conditioning unit in Shepherdsville.

It is non-stop for all the technicians at Prudential Heating and Air.

"This summer, we're really starting to get busy now," said Wolff.

July is normally the busiest month, but during this heat wave, repair crews are working overtime to try and keep up with demand.

"They're pushed about as far as I can push them," said Mark Schroeder, service manager at Prudential.

He said Prudential normally provides same-day or next-day service but, right now, there is a three-day backlog for air conditioner repair.

The searing temperatures are putting a strain on home air units.

"With this kind of heat, not only is it running a lot more, but it's running under a lot harder conditions," said Schroeder.

There are harder conditions as well for those fixing the problems.

"You just could keep working and occasionally get a drink of water and move along," said Wolff, occasionally wiping his brow.

But it is not just the techs working overtime. Prudential has also added extra staff to answer the phones.

"So, when the phones ring, you get a live person, and they can talk to the customer. A lot of times we can help them out over the phone," said Schroeder.

Homeowner Hank Hensel is certainly grateful for David Wolff's help.

"It's always much appreciated. The kind of work he does. He keeps our house cool, and that's something you gotta have," he said.

Though the hours are long and the temperature hot, Wolff said his job his satisfying.

"It definitely feels good to help people out that, especially with medical conditions or whatever. They're in a hot house, and you get in there and take care of it for them," he said.

But all the experts say the best way to stay cool is to have your air conditioner serviced in the spring before the heat wave hits.

"Don't wait until it's 95 degrees," Said Schroeder.

The heat wave does not appear to be straining local utilities.

LG&E said peak demand on Thursday was 6300 megawatts. That is not close to the record of 7175 megawatts in Aug. 2010.

The Louisville Water Company said it pumped an average of 130 million gallons this past week.

That is above average, but nowhere near the record of 204 million gallons in one day set in 2005. The water company's capacity is 240 million gallons per day.

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