Like any contract, an HVAC service agreement should specify the "who, what, when and where" of the attention your equipment receives from the provider you engage.

New HVAC systems, especially air conditioners, are more efficient than models installed 10 years ago, Callais says, and they have fewer issues and require less maintenance.

Whether an HVAC contracting company is large or small, new to the industry, or an established entity, a well-manicured maintenance agreement program can help strengthen the entire operation.

I want to arrange a maintenance plan for these systems, but prices vary greatly, as do the services included. I've seen everything from a 10-minute check of the gauge to longer cleaning of inside ...