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Meyer lemons have good cold tolerance, better than other lemons because it's not a pure lemon. Lemons generally are cold sensitive, more sensitive than oranges. Meyer lemon has better cold tolerance than an orange but compared to satsumas or something not as good.My Meyer lemon did great in Cincinnati. I kept it outside during summer. When temps went below freezing brought it in. Sometimes it loses leaves indoors. Need to spray with mist, try to keep some humidity during dry winters and keep grow lights on it. It does better outside in the summer but I had it blooming in winter. It blooms all year off and on. It did better indoors than bananas or other stuff. My other citrus got too big but the dwarf Meyer lemon tops out at six foot and will stay smaller in smaller pots. Dwarf oranges and tangerines are 8 feet or 10 feet. The dwarf Meyer lemon is the smallest and perfect for a really large container.
This topic has been discussed in this forum and in its earlier version. To summarize, in cold weather, citrus go dormant. They don't need sunlight. They can be kept in the dark for up to 15 weeks without harm Cold soil and warm temperatures inside the cover can lead to leaf drop.Putting a tree in the basement or garage is sufficient most of the time. A dark tarp cover and a heat source can work.https://tropicalfruitforum.com/index.php?topic=44367.msg437008#msg437008
I live in zone8b and I never bring my citrus inside. I have several varieties of citrus in the ground. They survive the cold really well.