that answer is kind of flawed. mold doesnt grow from nothing. it needs a source. the temperature change isnt going to create mold. first mold will need something to grow on such as moisture.
as long as the house is sealed and NO leaking into the house, including condensation on metal heater grates, and things as such, you should be fine.
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mold will not grow in cold climates,it needs moisture and warm temps,it may grow in the summer if the house is damp
No air circulation is probably more the reason that mold is growing inside your house. Pay someone to open the house and run a couple of fans periodically.
black mold is common in ductwork in the south, the simple answer is yes, and its from moisture buildup more than just temperature
the problem would be far worse in the summer time, you could buy a programmable thermostat and run the a/c 1 day a week or something to make it a bit less likely to happen, or simply hire a duct sanitizing / cleaning crew if this problem does indeed arise
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