Services may include general cleaning and preventative maintenance, on call repairs, and loaner equipment when necessary. The duration varies, depending upon the industry standard, your particular need, and the cost. Usually a contract is in effect for a minimum of one year and a maximum of five. It is important to know when your contract expires so that a new contract may be negotiated prior to the expiration of the current one. Be sure you get the contract which meets your needs.
Unnecessary coverage adds to the cost.
The older the equipment, the more it will cost. Sometimes travel time is an additional cost. Be sure that any cost associated with travel time is clarified within the contract. The vendor needs to know who is authorized to request a service call. Unauthorized calls can result in unauthorized charges.