surprised it didn't come with one
Our Sabal Chase CYV came with one when new. They are not that expensive if you are a DIYer, or even to have it installed. You might want to have the humidistadt installed at the same time. There are thermostats that do both (automatic settings and humidistadt).
And yes, I would recommend one - most have an automatic setting that will go from heat to A/C, which is especially nice if you leave for extended periods. The weather here can change dramatically.
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