re: AC/Heat issues

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It's less than a year old rheem, could thr cold cause that to break somehow?

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Not likely - less than a year old, you should have a 1 year labor warranty which pretty standard, parts 10 years if properly registered (5 years if not), maybe call the installing company for service before you leave the office to get on their list - you know they are have a list of service calls - you can always call and cancel if you figure it out when you get home.