When your furnace stops working on a cold night, you need a heating contractor who responds fast and gets the job done right. Sinclair Air Systems has been providing furnace repair in Covina and throughout the San Gabriel Valley since 1980. Our NATE-certified technicians diagnose and fix all furnace makes and models — gas, electric, and dual-fuel systems.
If you notice any of these issues, call Sinclair Air at (626) 331-4541 before the problem gets worse.
Ignitor and pilot light repair — restoring reliable ignition so your furnace fires up every time.
Blower motor replacement — fixing weak airflow and overheating issues.
Thermostat troubleshooting — ensuring your heating system responds correctly.
Heat exchanger inspection — checking for cracks that can leak carbon monoxide.
Gas valve and burner repair — addressing flame and gas supply problems.
Don’t wait for a complete breakdown. Call Sinclair Air Systems at (626) 331-4541 or request service online.
Most furnace repairs in the Covina and San Gabriel Valley area range from $150 to $500. Common repairs like ignitor replacement, thermocouple issues, or blower motor problems are on the lower end. Heat exchanger repairs or replacements are more involved and cost more. We always provide a free estimate before starting work.
If your furnace is under 15 years old and the repair cost is less than half the price of a new unit, repair is usually the better choice. Signs it may be time to replace include frequent breakdowns, uneven heating, yellow pilot light instead of blue, strange noises, or rising gas bills despite regular maintenance.
We recommend annual furnace maintenance every fall, before the heating season begins. Regular service catches small problems before they become expensive emergencies, extends your furnace’s lifespan, and ensures safe operation. Carbon monoxide leaks from cracked heat exchangers are a serious safety concern that routine inspections can detect early.
Yes, a cracked heat exchanger can leak carbon monoxide into your home, which is a serious health hazard. If we detect a cracked heat exchanger during an inspection, we’ll explain your options clearly. Sometimes the furnace can be repaired, but in many cases replacement is the safer and more cost-effective choice.
Yes, our technicians are trained to repair all major furnace brands including Carrier, Lennox, Trane, Rheem, Goodman, and more. We’ve been servicing furnaces in the San Gabriel Valley since 1980, so there’s very little we haven’t seen.
We provide furnace repair services throughout the San Gabriel Valley:
Contact Sinclair Air Systems today for a free estimate. Family-owned, serving the San Gabriel Valley since 1980.