Thanks so much for all your comments and sorry for the confusion about the system. I thought we had an Infinity 21 because the brochure we received with our proposal said Infinity 21. The actual estimate said:
The serial number for this unit is: 5007E01093.Code:Infinity Carrier MVB 2-stage variable speed L.P. furnace with a Carrier HNA heatpump system and an infinity controller. Infinity air purifier Media air cleaner
I don't know the size. The only thing I know is that it is a 4-ton unit.
When I went out to get the serial number, the unit was running.
Just an update on the temps. It is a BEAUTIFUL night here in Ohio. It is 11:00 pm and the temperature outside is 66*. The humidity is 69%. The thermostat is set to 69*. Guess what? The temperature in my house is 75*. We would love to open our windows, but we are keeping the shut. We don't want to throw off any numbers since the HVAC guy is coming tomorrow.