I had an aggressive termite colony destroy a header assembly about 2 years ago. I found their mud tubes. I replaced the header and damaged wood and treated the new wood with borate. I also purchased some termidor and spot treated the soil. I haven't seen any mud tube formations, but I want to have the perimeter of my house treated. I've called several companies and the price ranges from $400 to $1000. I'm having trouble selecting a company. The $400 estimate was from a one man crew company. He doesn't have the huge truck with tank. I think he will just use a hand held sprayer. What type of questions should I ask them? Also, a lot of companies try to sell insurance type protections. There is an annual service charge. Are these types of agreements worth it?