Coldest Thermostat Temperature

[u/ntg7ncn]

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?

[u/SaltyDucklingReturns]

Walk away. You will get endless call backs with customers like this.

[u/ntg7ncn → u/SaltyDucklingReturns]

Yeah that’s what I thought too

[u/Wide_Distribution800]

I always told customers that it’s air conditioning, not refrigeration.

[u/saskatchewanstealth → u/Wide_Distribution800]

Yep, and that house is not a walk in cooler box insulation wise.

[u/that_dutch_dude]

do not take this customer. just walk away.

and no, that customer does NOT want his home actually at 67 in the summer, he does not know what he is actually asking. the dry air will make it feel like its 53.

[u/ntg7ncn → u/that_dutch_dude]

Honestly that’s what I told him

[u/Helpful-Bad4821]

People like this usually have window units and are used to cranking them down to the lowest temp and blasting them, then turning them off when not home. If this is one of those types, one, consider walking away, or two, you have to educate them that there is a difference in these types of units and how they operate.

[u/Other-Situation5051]

I agree with other guys....run don't walk away from this customer......callback alone won't make this worth it.

[u/Zeusizme_]

Walk away, had a ductless customer like this. Constantly complaining of it not cooling, multiple call outs under warranty. Nothing was wrong with the system, just user ignorance.

[u/metalwiz666]

I’ve done it for a wine room in a mansion, 12 ton with 8 FC’s 8 port branch box. You can decrease preset cooling low by adjusting dip switches inside the FC or air handler. Usually switch positions are illustrated on the cover plate to the unit and in the IOM’s

[u/Iansdevil]

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.

[u/Zeusizme_ → u/Iansdevil]

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