If my friend Jim emails me and reminds me that he has a party at his house at 7pm, it is perfectly natural, idiomatic, correct, and grammatical if I email him back and say:
I get off work at 7pm, so I will probably be out to your house around 7:30.
The use of be out to basically is a long way of saying at. And either your sentence or mine can substitute at for be out to and maintain the same meaning.
Actually the use of out is deictic, specifying from the point of view of the telephone representative that your house is in the "location" of out. That is, the telephone rep is in a building and the techinician will arrive where you are located, which is out.
If I say, 'I'll be down to your house by 7pm,' then from my point of view, or location, your house is down from me.
Same for 'I'll be up to your house, over to your house...
Some utility companies may even use at instead of be out to. I don't recall a utility using be out to with me recently. Instead
Someone will be at your house between noon and 5.