We have been using pest shield for a year and weren't impressed. While the technicians were nice, the people in the office were snippy and didn't return calls. They charge quarterly fees to fill the tubes in the wall, but if you find any bugs in your home and need a treatment, you have to pay extra for the treatment. In other words, they do not guarantee their tube treatments. Another company we switched to does guarantee their tube services, which means I only pay four payments a year and if I have any pest problems inside my home, they will come and spray for free. We had Pest Shield come and spray for fleas twice (90$ for two treatments 3 weeks apart), but their flea treatment only has a 30 day warrantee. Flea eggs take 3 weeks to hatch (so you only have a few days to find them before you have to spend 90$ more dollars on a treatment). The company we switched to will spray for fleas 10 days apart, free of charge, as many times as necessary (this is because we're signed up for the quarterly tube service) to resolve the problem. It's a much better set up!
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