Short answer: a high gas bill with normal use usually means the furnace is working harder than it should, or heat is being lost before it reaches the rooms. Dirty burners, a weak flame, short-cycling, restricted airflow, a thermostat that fights the house, and leaky or restricted ducts can all push gas use up without any single dramatic breakdown. Compare like with like first: a colder month, a house that is now occupied more, or a thermostat set higher will all raise a bill legitimately. If usage is up in a similar month with similar settings, the furnace deserves a look.
On a visit, we check combustion and flame pattern, temperature rise, airflow, thermostat settings, and the heat exchanger, in order, so a bill problem is traced to a cause, not guessed at. A tune-up restores clean combustion and proper airflow, and it is also the visit that tells you honestly whether an aging furnace is now costing more to run than to replace.
Related reading: furnace repair in Springfield, furnace cost guide, common furnace problems. Call (615) 436-9171.
