Cold snaps often expose airflow restrictions, dirty sensors, or ignition issues that were easy to miss during milder weeks. Other signs include frequent on and off cycling, loud noises during startup, and rooms that never reach the thermostat setting. Once we identify the cause, we explain what failed, what options make sense, and what steps help reduce repeat problems. In some cases, duct sealing and repair helps when air leaks or disconnected sections reduce the amount of warm air reaching key rooms. A maintenance check often includes inspecting burners, cleaning key sensors, verifying safe operation, and confirming proper airflow and temperature rise. If a furnace repair hendersonville is older and needs frequent service, we also discuss heating installation and replacement options in a straightforward way, including what sizing and airflow requirements matter most