As I understand it, Dean's only provides an annual contract, and they do a "partial" treatment every year. I have a 10-year contract with Massey, but you would need to get a full house treatment to start the contract. It cost me $400 for the initial treatment and about $90 per year to renew. Personally, I prefer Massey to Dean's because of the long term contract, and I don't like the partial annual treatments. The Massey treatment lasts 10 years, and they pump chemicals around the entire perimeter of the house, every 16 inches.
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