Homeowner checklist

Furnace technology: efficiency, heating stages and airflow

Use these steps to plan, check and keep a record of your next actions.

• Request the exact furnace model, AFUE, output and minimum firing rate.
• Record burner stages separately from blower specifications.
• Confirm sizing accounts for the home and planned enclosure improvements.
• Ask for measured airflow and duct resistance, plus any required corrections.
• Keep venting, condensate, controls, commissioning and safety records.

Notes & questions to follow up