Each AMP agreement covers a full 12 months of service protection. Moreover, any service warranty will be automatically doubled for two years of coverage.In this post, we're going to provide you with everything you need to create the perfect HVAC service contract. 3C Mechanical offers a great service agreement plan for your HVAC system. Don't let the lack of maintenance let your system go down. A maintenance services agreement is a legal document between two parties in which one party provides ongoing maintenance support for the other party. The new equipment owner can simply fill out the enclosed form with a check and submit it to Trinity Warranty. Your HVAC technician has probably asked you if you want an HVAC maintenance plan before. But what are they, and are they really worth it? Use our HVAC maintenance contract template to define service schedules, costs, and terms.