thermostat

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I am adding central air to my son's house. He has a boiler for heat with a heat only thermostat that has 18-2 wire.

The air handler will be in the attic.

Can I purchase a thermostat that will operate both the boiler and the air handler? Or will I need 2 thermostats. I understand that there may be some issues with two transformers(boiler and air handler) on the same thermostat.

If I can use only one thermostat will I have to run 18-5 wire?

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