The Watcher

Celeste Schumacher inherits an old house when her parents pass away unexpectedly. She meets an elderly neighbor who appears kind on the surface, but harbors a secret.
When her AC breaks down, a handsome technician is sent to repair it. As her neighbor disables the electricity to the house, she and the technician are stranded. Now, their survival depends on their ability to work together and defeat the neighbor's attack dogs, intent on killing them.