Carrier/First Energy device

The home had a Comfortmaker heating system and a Frigidaire cooling system.

What is the device for. First Energy not open now to ask. I opened it up and it has components similar to furnace.

It is it used with the thermostat. This was also Carrier. What does it do?

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144209 044 (Small).jpg

Was there zones ( dampers) in the system

No there was not.

Monitoring device most likely