A furnace replacement is sized to the heat load of the house, not copied from the old nameplate by habit. Ducts, venting, and the electrical or gas connection have to match the new equipment.
If a heat pump is part of the plan, we say whether the furnace stays as backup. A Chicago winter is part of that conversation.
If you smell gas, leave the area and contact 911 or your gas utility.
Gas furnace replacements
Connections, venting, and thermostat setup
A run test before we leave
Heat-pump pairings when the furnace is the backup
Phone: 224 360-1633. Email: info@usaappliancehvac.com.