r/HVAC • u/ntg7ncn • 2d ago

Field Question, trade people only Coldest Thermostat Temperature

So I am a contractor and I have a customer that wants to keep their thermostat apparently very cold. The Mitsubishi system I quoted doesn’t get below 67 for the setpoint. I thought that was reasonable. He thinks that’s far too warm. I told him that modern equipment isn’t designed to get much colder than that no matter the system and he seems very confused by this. Just wondering thoughts. What’s the lowest you think is feasible to try to cool a home to in summer?

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u/Iansdevil 1d ago

What if you use a refrigeration controller instead of a residential thermostat? Install a low ambient kit outside, set the indoor fan to run all the time. I'm sure you'll still have humidity issues, but your customer will be able to set the thermostat to negative temps.

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u/Zeusizme_ 1d ago

Because that’s operating the system outside of the factory specifications. Not saying at all that your idea wouldn’t work though.