[767Jockey]

This is my first winter in this house. It's a two story house, with two different gas fired forced hot air heating units (Carrier) and two separate A/C systems, one for each floor. When I run the heat for downstairs, the A/C compressor outside (the unit for downstairs) runs as well. Is this normal? I've never had forced air heat before, so I don;t know what normal ops is supposed to look like. The air that comes out of the register is pretty warm, but not hot. It's a White Rodgers digital thermostat if that matters. If anyone has any advice or troubleshooting I can do on this I'd appreciate it. Thanks!
Doug