We are renovating an old house with a fireplace, and I want to get a wood burning insert for heating back up and ambiance. I got one quote that recommended a large Lopi NexGen Hybrid. The first floor location of the fireplace is only about 600 square feet, so I'm worried about overheating the area. The company said it is easy to control heat output by just not adding a lot of wood. Is this true? What are other questions I should be asking about this installation, and should I get a second quote? I don't know anything about fireplaces!