I have the silver maintenance plan and Comfort Experts is very faithful about calling me to set up my annual check up on the ac/heating units. It does not cost any additional and their tech expert, Andrew J, found a part that needed replacing and it was covered too. He was very courteous, knowledgeable and kept me completely informed. He let me know water heaters were also now part of the plan. CE comes almost immediately if I have a problem. I highly recommend them.