Is there any type of audible and/or visual malfunction alarm that can be installed inside my rental units that would alert the tenants of a malfunction in the outdoor unit of the heat pumps? If so, who would install such a thing? Thanks for your help.
source https://hvac-talk.com/vbb/threads/2236212-Is-there-any-type-of-audible-and-or-visual-malfunction-alarm?goto=newpost
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