Can I stop HomeKit from turning on my air conditioner in winter?

If I say "Hey Siri, turn down the temperature" Siri will switch the thermostat from Heat Only to Auto and try to cool the house to the new temperature. It's currently -17 outside so I don't want it to do this, just lower the thermostat setting, nothing else. There must be a way to prevent Homekit from arbitrarily changing the thermostat's mode, especially without confirming it somehow.

This continues to be a problem. Even when I set my thermostat to heat or cold mode, HomeKit thinks it’s a-ok to change that mode. I had it turning on the AC in the Winter, now it is switching to heat in the Summer. This should not be the way it operates. I’m disabling HomeKit control of my smart thermostat because it just doesn’t work correctly. Apple fix this!

Can I stop HomeKit from turning on my air conditioner in winter?
 
 
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