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Can Mitsubishi heat pumps be set to heat to 50 degrees?

davidsmartin | Posted in General Questions on

My Fujitsu heat pump can normally set the heating temperature no lower than 60 degrees, but there is a function called “minimum heat” that will reduce the setting to 50 degrees.  That is very useful when the house will be empty for an extended period.  Do Mitsubishi heat pumps have a similar setting?


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  1. mr_reference_Hugh | | #1

    Here is a link to the GBA Q&A. Looks like this question is asked relatively freequently.

    Mitsubishi wired and wireless thermostats minimum set temperature?

    My own research allowed me to find this but I would read the link above, which also contains other links.

    I think it is going to depend on the outdoor and indoor unit you select.

    Example: Look at the table at the bottom of page 4 of 8 in this document.

    Controller general set point temperature range:
    Cool/Dry: 50°F-99°F

    Controller temperature range when connected to the
    MSZ-FH/MUZ-FH system:
    Cool/Dry: 61°F-88°F

  2. davidsmartin | | #2

    Thanks for finding this solution. I suspected the question had been asked but I couldn't figure out what to search for.

  3. Patrick_OSullivan | | #3

    It's less useful than you think.

    It's better for structures to be at a uniform temperature and to avoid extreme setbacks. If you're contemplating heating a structure to a 50 F minimum, you should contemplate improving that structure's envelope such that a higher minimum is a non-issue.

    1. Expert Member
      DCcontrarian | | #5

      I would disagree. I have a couple of seasonal properties and every winter I drain the pipes and leave them unheated. I've never had problems and this is in New England where it regularly gets below zero in winter.

      I would argue that virtually everything that attacks houses is biological and that virtually all biological processes slow down when the temperature drops. Turning off the heat is the equivalent of putting your house in the freezer for the winter. I'd also argue that the exterior walls of a house are exposed to sub-freezing temperatures even when the house is heated; the interior walls are made of the same materials.

      The only caveat I would add is that pipes with water in them cannot stand freezing. If you're not draining the pipes it's a legitimate question how cold you can go on the thermostat setting without endangering the plumbing.

  4. jwasilko | | #4
  5. richmass62 | | #6

    I have a Mitsubishi thermostat that only allows the set point to be 63 degrees or higher. I believe the model is PAR-40MAAU. I was told that I can replace this with the MHK2 thermostat which enables me to get the set point down into the 50s. I will be doing that before next season.

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