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Originally Posted by opendoor
It's really not an issue at all. Almost everywhere with any kind of real heating/cooling needs has a mismatch between heating and cooling loads. You just size the equipment for whichever is more appropriate; generally that's heating for heating-dominated climates and cooling for cooling-dominated climates.
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You cannot have too much of a mismatch of size though. Manufacturers I've dealt with generally have a recommended size range. E.g., for Carrier's "Infinity" 24 SEER series:
Biggest acceptable discrepancy is 42,000 BTUh (3.5 tons) cooling vs. 60,000 BTUh heating.
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Short cycling can be an issue, but it's more of a problem with modulating equipment.
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Less of a problem with modulating equipment, you mean.
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My main heat pump can output between 3K-26K BTUs in heating or cooling mode, so if the cooling needs are less than 3K, then it'll kick on and off pretty regularly which isn't great for units that are designed to run 24 hours a day. But by the time it gets warm enough inside to warrant turning it on, the cooling needs are at least that high.
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Curious what you've got; I've never seen a unit with a 10:1 turndown. 4:1, sure.
Also curious what you've got because 26 MBH heating is pretty small... Certainly too small for an average house in Calgary.